Java sample code 01

1. Java sample program

I communicated the source posted in SAMPLE GALLERY and added an import statement.

--Java basics --Hello World (output characters to console) --for statement (loop) --if statement (conditional branch) --Switch statement (conditional branch) --Simple four arithmetic operations --Method call --Method call (with arguments) --Array --Multidimensional array --Enter on console --Getting the number of characters --List class --Map class --Set class --Java String class (string) --Determine if the two strings are the same: equals --Judge whether two strings are the same regardless of case: equalsIgnoreCase --Compare the size of strings in lexicographic order: compareTo --Compare large and small strings in lexicographic order regardless of case: compareToIgnoreCase --Concatenation of strings: concat --Get one character: charAt --Get part of the string: substring --Category conversion: toLowerCase, toUpperCase --Java Math class (numerical processing) --Math.max (int, int) (returns a large value) --Math.min (int, int) (returns a small value) --Math.floor (double) --Math.round (double) (rounded) --Math.ceil (double) (rounded up) --Math.abs (int) (absolute value) --Math.abs (double, double) (power) --Math.random () --Java Calendar, Date, DateFormat class (date processing) --Create a Calendar object for today (now) --Get year, month, day, hour, minute, second --Create a Calendar object for a specific date --add (int field, int amount) (Edit the value of Calendar object) --Calendar.before/after (date comparison) --Create java.util.Date object --SimpleDateFormat (display date and time in any format) --Java File (file processing) --Create file: createNewFile () --Delete file: delete () --Creating a directory: mkdir () --Creating a directory: mkdirs () --Get file name (or directory name): getName () --Get Absolute Path: getAbsolutePath () --Get parent directory object: getParentFile () --Get the path of the parent directory: getParent () --Determine whether it is a directory: isDirectory () --Judge whether it is a file: isFile () --Determine if it is a hidden file: isHidden () --Determine if a file (or directory) exists: exists () --Get last modified date: lastModified () --Get all files and directories directly under the directory: listFiles () --Get files and directories directly under the directory by specifying conditions: FilenameFilter --Java BigDecimal class (numerical processing) --Create a BigDecimal object --Addition (addition): add (BigDecimal augend) --Subtraction: subtract (BigDecimal subtrahend) --Multiplication: multiply (BigDecimal multiplicand) --Division: divide (BigDecimal divisor) --Truncation: RoundingMode.FLOOR --Round up: RoundingMode.CEILING --Rounding: RoundingMode.HALF_UP --Absolute value: abs () --Exponentiation: pow (int n)

• max(BigDecimal val)
• min(BigDecimal val) --Comparison of size: compareTo (BigDecimal val) --Remainder of division: remainder (BigDecimal divisor)

1. Java sample program

1-1. Java basics

1-1-1.Hello World (characters are output to the console)

public class SampleJava {

  public static void main(String[] args) {
    System.out.println("Hello World!");
  }

}

1-1-2.for statement (loop)

public class SampleJava {

  public static void main(String[] args) {
    int sum = 0;

    //「for (int i = 1; i <= 5; i++) {Regarding
    //int i =1 ⇒ Initialize i with 1
    //i <=5 ⇒ If i is 5 or less, loop processing is performed.
    //i++⇒ Add 1 to i (after the process of no loop is finished)
    for (int i = 1; i <= 5; i++) {
      sum += i;//Add i to the variable sum
    }
    System.out.println(sum);//Show variable sum
  }

}

1-1-3.if statement (conditional branch)

public class SampleJava {

  public static void main(String[] args) {
    int a = 11;//You can change here freely.

    if (a > 10) {//Determine if it is greater than 10
      System.out.println("a is greater than 10.");
    } else {
      System.out.println("a is 10 or less.");
    }
  }

}

1-1-4.switch statement (conditional branch)

public class SampleJava {

  public static void main(String[] args) {
    int score = 4;//You can freely change the number here from 1 to 5.
    String result = null;

    switch (score) {
      case 5://When score is 5
        result = "A";
        break;
      case 4://When score is 4
        result = "B";
        break;
      case 3://When score is 3
        result = "C";
        break;
      case 2://When score is 2
        result = "D";
        break;
      case 1://When score is 1
        result = "E";
        break;
      default://When score is other than the above
        break;
    }

    if (result != null) {
      System.out.println(result + "It is an evaluation.");
    }
  }

}

1-1-5. Simple four arithmetic operations

public class SampleJava {

  public static void main(String[] args) {
    int a = 10;
    int b = 5;

    //Addition
    System.out.println(a + b);

    //Subtraction
    System.out.println(a - b);

    //Multiply
    System.out.println(a * b);

    //division
    System.out.println(a / b);
  }

}

1-1-6. Calling a method

public class SampleJava {

  public static void main(String[] args) {
    moring();
    noon();
    evening();
  }

  private static void moring() {
    System.out.println("It's morning.");
  }

  private static void noon() {
    System.out.println("It's noon.");
  }

  private static void evening() {
    System.out.println("It's night.");
  }

}

1-1-7. Method call (with arguments)

public class SampleJava {

  public static void main(String[] args) {
    int output = plus(10, 30);
    System.out.println(output);
  }

  /**
   *A method that allows you to pass arguments.
   *Returns the result of adding a and b.
   * @param a
   * @param b
   * @return
   */
  private static int plus(int a, int b) {
    return a + b;
  }

}

1-1-8. Array

public class SampleJava {

  public static void main(String[] args) {
    //Array declaration
    int[] intArray = { 10, 20, 30, 40, 50 };

    //below[]Specify the number in and retrieve any value in the array. 0-4 in this example.
    System.out.println(intArray[0]);
  }

}

1-1-9. Multidimensional array

public class SampleJava {

  public static void main(String[] args) {
    //Declaration of multidimensional array
    String[][] testScore = {
      { "National language", "80" }
      , { "arithmetic", "90" }
      , { "society", "70" }
      , { "Science", "75" }
    };

    System.out.println("Subject:" + testScore[1][0] + ", Score:" + testScore[1][1]);
  }

}

1-1-10. Input to the console

import java.util.Scanner;

public class SampleJava {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String inputStr = scan.next();//Get what you typed in the console here
        System.out.println("The characters entered on the console are "" + inputStr + ""is.");
    }

}

1-1-11. Acquisition of the number of characters

public class SampleJava {

  public static void main(String[] args) {
    String str = "Good morning";
    System.out.println(str.length());//length()Get the number of characters with
  }

}

1-1-12.List class

import java.util.ArrayList;
import java.util.List;

public class SampleJava {

    public static void main(String[] args) {
        List<String> list = new ArrayList<String>();
        list.add("10");
        list.add("15");
        list.add("20");
        System.out.println(list.get(1));//list.get(index)Get the value of list with. 0 at the very beginning
    }

}

1-1-13.Map class

import java.util.HashMap;
import java.util.Map;

public class SampleJava {

    public static void main(String[] args) {
        Map<String, String> map = new HashMap<String, String>();
        //Map below.put(key, value)Set the value with
        map.put("A", "100");
        map.put("B", "80");
        map.put("C", "60");
        map.put("D", "40");
        map.put("E", "20");

        //map.get(key)Get the value of the key specified in
        System.out.println(map.get("C"));
    }

}

1-1-14. Set class

import java.util.HashSet;
import java.util.Set;

public class SampleJava {

    public static void main(String[] args) {
        Set<String> set = new HashSet<String>();
        //Add a value to set below. The same value is not added. In the example below, only one A is added.
        set.add("A");
        set.add("A");
        set.add("B");
        set.add("C");

        for (String val : set) {
            System.out.println(val);
        }
    }
}

1. Java sample program

1-2.Java String class (character string)

1-2-1. Judgment whether two character strings are the same: equals

public class SampleString {

  public static void main(String[] args) {
    String str1 = "abcde";
    String str2 = "abcde";
    String str3 = "fghij";

    //「A.equals(B)To determine if A and B have the same value.
    //true because str1 and str2 have the same value.
    System.out.println(str1.equals(str2));

    //Since str1 and str3 are different values, false.
    System.out.println(str1.equals(str3));
  }
}

1-2-2. Judging whether two strings are the same regardless of case: equalsIgnoreCase

public class SampleString {

  public static void main(String[] args) {
    String str1 = "Abcde";
    String str2 = "abcde";
    String str3 = "fghij";

    //「A.equalsIgnoreCase(B), To determine if A and B are the same value, regardless of case.
    //Since str1 and str2 have the same value, true ("A" and "a" are considered to be the same).
    System.out.println(str1.equalsIgnoreCase(str2));

    //Since str1 and str3 are different values, false.
    System.out.println(str1.equalsIgnoreCase(str3));
  }
}

1-2-3. Compare the size of character strings in lexicographic order: compareTo

public class SampleString {

  public static void main(String[] args) {
    String str1 = "def";
    String str2 = "abc";
    String str3 = "ghi";
    String str4 = "def";

    //「A.compareTo(B), Compare the size of the character string in lexicographic order.
    //0 or less if A comes before B in the dictionary
    //0 if A and B are the same
    //0 or more if A comes after B in the dictionary
    //become.

    //Since str1 comes after str2, it becomes 0 or more.
    System.out.println(str1.compareTo(str2));

    //Since str1 comes before str3, it becomes 0 or less.
    System.out.println(str1.compareTo(str3));

    //Since str1 is the same as str4, it becomes 0.
    System.out.println(str1.compareTo(str4));
  }
}

1-2-4. Compare the size of strings in lexicographic order regardless of case: compareToIgnoreCase

public class SampleString {

  public static void main(String[] args) {
    String str1 = "def";
    String str2 = "Def";

    //「A.compareToIgnoreCase(B), Compare the size of the character string in lexicographic order.
    //It is not case sensitive (it is considered the same).

    //Since str1 is the same as str2, it becomes 0 ("d" and "D" are considered to be the same).
    System.out.println(str1.compareToIgnoreCase(str2));
  }
}

1-2-5. String concatenation: concat

public class SampleString {

  public static void main(String[] args) {
    String helloStr = "Hello";
    String spaceStr = " ";
    String worldStr = "World";

    // concat(String str)Combine strings with
    System.out.println(helloStr.concat(spaceStr).concat(worldStr));
  }
}

1-2-6. Get one character: charAt

public class SampleString {

  public static void main(String[] args) {
    String str = "Hello World.";

    //charAt(int index)Get one character in the string with.
    //The character to be acquired is specified by the index argument.
    System.out.println(str.charAt(0));
  }
}

1-2-7. Get part of the string: substring

public class SampleString {

  public static void main(String[] args) {
    String str = "Hello World.";

    //substring(int beginIndex, int endIndex)Get a part of the string with.
    //The character string to be acquired is specified by the index argument.
    System.out.println(str.substring(0, 5));
  }
}

1-2-8. Case conversion: toLowerCase, toUpperCase

public class SampleString {

  public static void main(String[] args) {
    String str1 = "HELLO";
    String str2 = "world";

    //toLowerCase()Convert uppercase letters to lowercase letters with.
    System.out.println(str1.toLowerCase());

    //Convert lowercase letters to uppercase with toUpperCase.
    System.out.println(str2.toUpperCase());
  }
}

1. Java sample program

1-3. Java Math class (numerical processing)

1-3-1.Math.max (int, int) (returns a large value)

public class SampleMath {

  public static void main(String[] args) {
    //Change the values of a and b below to arbitrary
    int a = 10;
    int b = 20;

    //Math.max(int, int)Returns the larger argument.
    System.out.println(Math.max(a, b));
  }
}

1-3-2.Math.min (int, int) (returns a small value)

public class SampleMath {

  public static void main(String[] args) {
    int a = 6;
    int b = 7;

    //Math.min(int, int)Returns the smaller value.
    System.out.println(Math.min(a, b));
  }
}

1-3-3.Math.floor (double) (truncation)

public class SampleMath {

  public static void main(String[] args) {
    double a = 100.9;

    //Math.floor(double).. Truncate after the decimal point.
    System.out.println(Math.floor(a));
  }
}

1-3-4.Math.round (double) (rounded)

public class SampleMath {

  public static void main(String[] args) {
    double a = 7.5;

    //Math.round(double).. Rounded to the nearest whole number.
    System.out.println(Math.round(a));
  }
}

1-3-5.Math.ceil (double) (rounded up)

public class SampleMath {

  public static void main(String[] args) {
    double a = 20.1;

    //Math.ceil(double).. Round up after the decimal point.
    System.out.println(Math.ceil(a));
  }
}

1-3-6.Math.abs (int) (absolute value)

public class SampleMath {

  public static void main(String[] args) {
    int a = -7;

    //Math.abs(int).. Returns the absolute value.
    System.out.println(Math.abs(a));
  }
}

1-3-7.Math.abs (double, double) (power)

public class SampleMath {

  public static void main(String[] args) {
    double a = 10;
    double b = 2;

    //Math.abs(double, double).. Returns a power. In this example, 10 squared is 100
    System.out.println(Math.pow(a, b));
  }
}

1-3-8.Math.random () (random number)

public class SampleMath {

  public static void main(String[] args) {
    //Math.random()。0.0 or more 1.Randomly returns numbers less than 0.
    System.out.println(Math.random());
  }
}

1. Java sample program

1-4. Java Calendar, Date, DateFormat class (date processing)

1-4-1. Create a Calendar object for today (now)

import java.util.Calendar;

public class SampleCalendar {

    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance();
        System.out.println(cal);
    }
}

1-4-2. Get year, month, day, hour, minute, second

import java.util.Calendar;

public class SampleCalendar {

    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance();
        System.out.println("Year:" + cal.get(Calendar.YEAR));
        System.out.println("Month:" + (cal.get(Calendar.MONTH) + 1));//Month is 0~Because of 11+1
        System.out.println("Day:" + cal.get(Calendar.DATE));
        System.out.println("Time:" + cal.get(Calendar.HOUR_OF_DAY));
        System.out.println("Minutes: Minutes:" + cal.get(Calendar.MINUTE));
        System.out.println("Seconds:" + cal.get(Calendar.SECOND));
    }
}

1-4-3. Create a Calendar object with a specific date

import java.util.Calendar;

public class SampleCalendar {

    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance();
        cal.set(2010, 0, 1);//Set January 1, 2010. Month is 0~Since it is 11, set 0.

        //「2010/1/1 "is displayed.
        System.out.println(cal.get(Calendar.YEAR)
                + "/" + (cal.get(Calendar.MONTH) + 1)
                + "/" + cal.get(Calendar.DATE));
    }
}

1-4-4.add (int field, int amount) (Edit the value of Calendar object)

import java.util.Calendar;

public class SampleCalendar {

    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance();

        //Today's date is displayed
        displayConsole(cal);

        //add(int field, int amount)You can increase or decrease each value of the Calendar object such as year, month, and day with.
        //The following is reducing the number of days by one day.
        cal.add(Calendar.DATE, -1);
        displayConsole(cal);

        //The following is increasing the month by one month.
        cal.add(Calendar.MONTH, 1);
        displayConsole(cal);
    }

    private static void displayConsole(Calendar cal) {
        System.out.println(cal.get(Calendar.YEAR)
                + "/" + cal.get(Calendar.MONTH)
                + "/" + cal.get(Calendar.DATE));
    }
}

1-4-5.Calendar.before / after (date comparison)

import java.util.Calendar;

public class SampleCalendar {

    public static void main(String[] args) {
        Calendar calA = Calendar.getInstance();
        Calendar calB = Calendar.getInstance();
        calB.add(Calendar.DATE, 1);//Set calB to the value one day later.

        //Returns true if calA is a date and time before calB. True in this example.
        System.out.println(calA.before(calB));
        //Returns true if calA is a date and time after calB. False in this example.
        System.out.println(calA.after(calB));
    }

}

1-4-6. Creating a java.util.Date object

import java.util.Calendar;
import java.util.Date;

public class SampleDate {

    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance();
        Date date = cal.getTime();
        System.out.println(date);
    }

}

1-4-7.SimpleDateFormat (displays the date and time in any format)

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class SampleDate {

    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance();
        Date date = cal.getTime();

        //Created a format to display "year". Example: 2016
        DateFormat format = new SimpleDateFormat("yyyy");
        System.out.println(format.format(date));

        //Create a format to display "month". Example: 05
        format = new SimpleDateFormat("MM");
        System.out.println(format.format(date));

        //Create a format to display "day". Example: 01
        format = new SimpleDateFormat("dd");
        System.out.println(format.format(date));

        //Create a format to display "hours". Example: 00
        format = new SimpleDateFormat("HH");
        System.out.println(format.format(date));

        //Create a format to display "minutes". Example: 00
        format = new SimpleDateFormat("mm");
        System.out.println(format.format(date));

        //Create a format to display "seconds". Example: 00
        format = new SimpleDateFormat("ss");
        System.out.println(format.format(date));

        //「○○/○○/○○ ”is displayed. Example: 2000/01/01
        format = new SimpleDateFormat("yyyy/MM/dd");
        System.out.println(format.format(date));

        //"○○ year ○○ month ○○ day ○○:○○:XX (XX hours XX minutes XX seconds) "is displayed. Example: January 1, 2000
        format = new SimpleDateFormat("yyyy year MM month dd day HH:mm:ss");
        System.out.println(format.format(date));

    }

}

1. Java sample program

1-5. Java File (file processing)

1-5-1. Creating a file: createNewFile ()

import java.io.File;
import java.io.IOException;

public class SampleDate {

    public static void main(String[] args) {
        //Creating a file object. In the argument, specify the path of the file to be created.
        File file = new File("C:\\sample\\test.txt");
        try {
            //The file is created below.
            file.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

1-5-2. Delete file: delete ()

import java.io.File;

public class SampleDate {

    public static void main(String[] args) {
        File file = new File("C:\\sample\\test.txt");
        //Deletes the file specified below.
        file.delete();
    }

}

1-5-3. Creating a directory: mkdir ()

import java.io.File;

public class SampleDate {

    public static void main(String[] args) {
        File file = new File("C:\\sample\\sampledir");
        //Creates the directory specified below.
        file.mkdir();
    }

}

1-5-4. Creating a directory: mkdirs ()

import java.io.File;

public class SampleDate {

    public static void main(String[] args) {
        File file = new File("C:\\sample\\sampledir\\sampledir2");
        //Create a directory below. mkdir()Unlike, it also creates what you need in the parent directory.
        //In this example, "C:\\If you run it with a directory called "sample"
        //Two "sampledir" and "sampledir2" are created.
        file.mkdirs();
    }

}

1-5-5. Get file name (or directory name): getName ()

import java.io.File;

public class SampleDate {

    public static void main(String[] args) {
        File file = new File("C:\\sample\\test.txt");
        //Get the name of the specified file (or directory)
        System.out.println(file.getName());
    }

}

1-5-6. Get absolute path: getAbsolutePath ()

import java.io.File;

public class SampleDate {

    public static void main(String[] args) {
        File file = new File("C:\\sample\\test.txt");
        //Get the absolute path of the file
        System.out.println(file.getAbsolutePath());
    }

}

1-5-7. Get parent directory object: getParentFile ()

import java.io.File;

public class SampleDate {

    public static void main(String[] args) {
        File file = new File("C:\\sample\\test.txt");

        //Get parent directory object
        File parent = file.getParentFile();

        System.out.println(parent);
    }

}

1-5-8. Get the path of the parent directory: getParent ()

import java.io.File;

public class SampleDate {

    public static void main(String[] args) {
        File file = new File("C:\\sample\\test.txt");

        //Get the path of the parent directory
        String parentPath = file.getParent();

        System.out.println(parentPath);
    }
}

1-5-9. Judgment whether it is a directory: isDirectory ()

import java.io.File;

public class SampleDate {

    public static void main(String[] args) {
        File file = new File("C:\\sample");

        //Determine if it is a directory below. True because it is a directory in this example.
        System.out.println(file.isDirectory());
    }
}

1-5-10. Judgment whether it is a file: isFile ()

import java.io.File;

public class SampleDate {

    public static void main(String[] args) {
        File file = new File("C:\\sample");

        //Determine if it is a file below. False in this example because it is a directory.
        System.out.println(file.isFile());
    }
}

1-5-11. Determine if it is a hidden file: isHidden ()

import java.io.File;

public class SampleDate {

    public static void main(String[] args) {
        File file = new File("C:\\sample\\test.txt");

        //Determine if it is a hidden file below.
        System.out.println(file.isHidden());
    }
}

1-5-12. Determine if a file (or directory) exists: exists ()

import java.io.File;

public class SampleDate {

    public static void main(String[] args) {
        File file = new File("C:\\sample\\test.txt");

        //Determine if a file (or directory) exists below
        System.out.println(file.exists());
    }
}

1. Java sample program

1-6. Java BigDecimal class (numerical processing)

1-6-1. Create BigDecimal object

import java.math.BigDecimal;

public class SampleBigDecimal {

    public static void main(String[] args) {
        //Create a BigDecimal object below
        BigDecimal obj = new BigDecimal("1");

        System.out.println(obj);
    }
}

1-6-2. Addition (addition): add (BigDecimal augend)

import java.math.BigDecimal;

public class SampleBigDecimal {

    public static void main(String[] args) {

        BigDecimal obj1 = new BigDecimal("1");
        BigDecimal obj2 = new BigDecimal("2");

        //add(BigDecimal augend)Adds with and returns the result.
        BigDecimal result = obj1.add(obj2);

        System.out.println(result);
    }
}

1-6-3. Subtraction: subtract (BigDecimal subtrahend)

import java.math.BigDecimal;

public class SampleBigDecimal {

    public static void main(String[] args) {

        BigDecimal obj1 = new BigDecimal("5");
        BigDecimal obj2 = new BigDecimal("3");

        //subtract(BigDecimal subtrahend)Subtract with and return the result.
        BigDecimal result = obj1.subtract(obj2);

        System.out.println(result);
    }
}

1-6-4. Multiplication: multiply (BigDecimal multiplicand)

import java.math.BigDecimal;

public class SampleBigDecimal {

    public static void main(String[] args) {

        BigDecimal obj1 = new BigDecimal("2");
        BigDecimal obj2 = new BigDecimal("4");

        //multiply(BigDecimal multiplicand)Multiplies with and returns the result.
        BigDecimal result = obj1.multiply(obj2);

        System.out.println(result);
    }
}

1-6-5. Division: divide (BigDecimal divisor)

import java.math.BigDecimal;

public class SampleBigDecimal {

    public static void main(String[] args) {

        BigDecimal obj1 = new BigDecimal("30");
        BigDecimal obj2 = new BigDecimal("5");

        //divide(BigDecimal divisor)Divide by and return the result.
        BigDecimal result = obj1.divide(obj2);

        System.out.println(result);
    }
}

1-6-6. Truncation: RoundingMode.FLOOR

import java.math.BigDecimal;
import java.math.RoundingMode;

public class SampleBigDecimal {

    public static void main(String[] args) {

        BigDecimal obj1 = new BigDecimal("400.545");

        //setScale(int newScale, RoundingMode roundingMode)Specify the number of digits and rounding operation with.
        //RoundingMode.FLOOR
        //The following example returns the result of truncating the first decimal place.
        obj1 = obj1.setScale(0, RoundingMode.FLOOR);

        System.out.println(obj1);
    }
}

1-6-7. Round up: RoundingMode.CEILING

import java.math.BigDecimal;
import java.math.RoundingMode;

public class SampleBigDecimal {

    public static void main(String[] args) {

        BigDecimal obj1 = new BigDecimal("400.545");

        //setScale(int newScale, RoundingMode roundingMode)Specify the number of digits and rounding operation with.
        //RoundingMode.CEILING
        //The following example returns the result of rounding up the second decimal place.
        obj1 = obj1.setScale(1, RoundingMode.CEILING);

        System.out.println(obj1);
    }
}

1-6-8. Rounding: RoundingMode.HALF_UP

import java.math.BigDecimal;
import java.math.RoundingMode;

public class SampleBigDecimal {

    public static void main(String[] args) {

        BigDecimal obj1 = new BigDecimal("400.545");

        //setScale(int newScale, RoundingMode roundingMode)Specify the number of digits and rounding operation with.
        //RoundingMode.HALF_UP (rounded)
        //The following example returns an object that is the result of rounding off to the third decimal place.
        obj1 = obj1.setScale(2, RoundingMode.HALF_UP);

        System.out.println(obj1);
    }
}

1-6-9. Absolute value: abs ()

import java.math.BigDecimal;

public class SampleBigDecimal {

    public static void main(String[] args) {

        BigDecimal obj = new BigDecimal("-1");

        //abs()Returns the absolute value with
        System.out.println(obj.abs());
    }
}

1-6-10. Power: pow (int n)

import java.math.BigDecimal;

public class SampleBigDecimal {

    public static void main(String[] args) {

        BigDecimal obj = new BigDecimal("2");

        //pow(int n)Returns the result of raising the value to the power (nth power).
        System.out.println(obj.pow(4));
    }
}

1-6-11.max(BigDecimal val)

import java.math.BigDecimal;

public class SampleBigDecimal {

    public static void main(String[] args) {

        BigDecimal obj1 = new BigDecimal("4");
        BigDecimal obj2 = new BigDecimal("3");

        //max(BigDecimal val)Compares objects with and returns the larger one.
        System.out.println(obj1.max(obj2));
    }
}

1-6-12.min(BigDecimal val)

import java.math.BigDecimal;

public class SampleBigDecimal {

    public static void main(String[] args) {

        BigDecimal obj1 = new BigDecimal("4");
        BigDecimal obj2 = new BigDecimal("3");

        //min(BigDecimal val)Compares objects with and returns the smaller one.
        System.out.println(obj1.min(obj2));
    }
}

1-6-13. Comparison of size: compareTo (BigDecimal val)

import java.math.BigDecimal;

public class SampleBigDecimal {

    public static void main(String[] args) {

        BigDecimal obj1 = new BigDecimal("1");
        BigDecimal obj2 = new BigDecimal("3");

        //compareTo(BigDecimal val)
        //Compare the object with that of the argument
        //If it is large, "1"
        //If they are the same, "0"
        //If it is small, "-1」
        //return it.
        if (obj1.compareTo(obj2) > 0) {
            System.out.println("large");
        } else if (obj1.compareTo(obj2) < 0) {
            System.out.println("small");
        } else {
            System.out.println("the same");
        }
    }
}

1-6-14. Remainder of division: remainder (BigDecimal divisor)

import java.math.BigDecimal;

public class SampleBigDecimal {

    public static void main(String[] args) {

        BigDecimal obj1 = new BigDecimal("11");
        BigDecimal obj2 = new BigDecimal("3");

        //remainder(BigDecimal divisor)Divide by and return the remainder.
        BigDecimal result = obj1.remainder(obj2);

        System.out.println(result);
    }
}