[Java] Overload / Override / Inheritance

Make a note of what you learned about Java overloading, overriding, and inheritance.

Overload

Overloading is ** writing multiple methods and constructors with the same name with different argument types and numbers. ** **

Method with overload

The same method name, but the return value may change depending on the number of arguments given. This defines a plus method that does the addition.

keisan.Java

//Sum method to add

public class sum {
    public int sum(int a) {
        return a;
    }
    public int sum(int a, int b) {
        return a + b;
    }
    public int sum(int a, int b, int c) {
        return a + b + c;
    }
}

Inherit the class.

Inheritance is the inheritance of any class by another class.

This time, Keisan.Java is inherited by Task.java, and arguments are given to perform the calculation.

Task.java

public class Task extends Keisan {

     public void taskJikkou() {
       System.out.println("【Execution result】");
       System.out.println("a is"Sum(1)); //result:a is1
       System.out.println("a +b is"Sum(5, 10)); //result: a +b is 15
       System.out.println("a + b +c is"Sum(100, 150, 200)); //result: a + b +c is 450
       }
} 

Create an instance in Main.java and execute it.

Main.java

 public class Main {
 
     public static void main(String[] args) {
        Task task = new Task(); //Create an instance
        task.taskJikkou(); //Task.Call the java taskJikkou method.
     }
 }

【Execution result】
a is 1
a +b is 15
a + b +c is 450

This time I was doing calculations, but it seems that I can express various things by using these. I'm excited that there are many uses, such as "driving" a car and "kodo" of an RPG.