[JAVA] 12 of Array

https://blog.csdn.net/andyzhaojianhui/article/details/78704219 The following content is from the above URL

Underside of stackoverflow, the number of votes, the number of votes, and the number of votes in the problem. 1. Statement

Java code

String[] aArray = new String[5];
String[] bArray = {"a","b","c", "d", "e"};
String[] cArray = new String[]{"a","b","c","d","e"};
2. Export one piece

Java code

int[] intArray = { 1, 2, 3, 4, 5 };
String intArrayString = Arrays.toString(intArray);

// print directly will print reference value
System.out.println(intArray);
// [I@7150bd4d

System.out.println(intArrayString);
// [1, 2, 3, 4, 5]
3. Included number of units

Java code

String[] stringArray = { "a", "b", "c", "d", "e" };
ArrayList arrayList = new ArrayList(Arrays.asList(stringArray));
System.out.println(arrayList);
// [a, b, c, d, e]
4. 检 查 1 piece number set inclusion / rejection certain piece

Java code

String[] stringArray = { "a", "b", "c", "d", "e" };
boolean b = Arrays.asList(stringArray).contains("a");
System.out.println(b);
// true
5. Jacobs bogie

Java code

int[] intArray = { 1, 2, 3, 4, 5 };
int[] intArray2 = { 6, 7, 8, 9, 10 };
// Apache Commons Lang library
int[] combinedIntArray = ArrayUtils.addAll(intArray, intArray2);
6. Statement within an array (Array inline)

Java code

method(new String[]{"a", "b", "c", "d", "e"});
7. Included number element release single character skewer

Java code

// containing the provided list of elements
// Apache common lang
String j = StringUtils.join(new String[] { "a", "b", "c" }, ", ");
System.out.println(j);
// a, b, c
8. General number group list conversion number group

Java code

String[] stringArray = { "a", "b", "c", "d", "e" };
ArrayList arrayList = new ArrayList(Arrays.asList(stringArray));
String[] stringArr = new String[arrayList.size()];
arrayList.toArray(stringArr);
for (String s : stringArr)
System.out.println(s);
9. A collection of conversions (set)

Java code

Set set = new HashSet(Arrays.asList(stringArray));
System.out.println(set);
//[d, e, b, c, a]
10. Reverse single array

Java code

int[] intArray = { 1, 2, 3, 4, 5 };
ArrayUtils.reverse(intArray);
System.out.println(Arrays.toString(intArray));
//[5, 4, 3, 2, 1]
11. Elements in the transfer number

Java code

int[] intArray = { 1, 2, 3, 4, 5 };
int[] removed = ArrayUtils.removeElement(intArray, 3);//create a new array
System.out.println(Arrays.toString(removed));
12. General integer conversion type array number set

Java code

byte[] bytes = ByteBuffer.allocate(4).putInt(8).array();

for (byte t : bytes) {
System.out.format("0x%x ", t);
}

Text origin andyzhaojianhui-like CSDN Expo, full-text site 击: https://blog.csdn.net/andyzhaojianhui/article/details/78704219?utm_source=copy