System.arraycopy method usage

System.arraycopy method uses

System provides a static method arraycopy(), we can use it to Implement copying between arrays.

The function prototype is:

public static void arraycopy(Object src,int srcPos,Object dest,int destPos,int length)

Parameter explanation:

src: source array;

srcPos: the starting point of the source array to be copied Position;

dest: destination array;

destPos: the starting position where the destination array is placed;

length: the length of the copy.

Note: Both src and dest must be of the same type or arrays that can be converted.

(Related video tutorial sharing: java video tutorial)

Test class:

public class SysTest {
 
    public static void main(String[] args) {
        String src[] = new String[] { "hello", "huang", "bao", "kang" };
        String dest[] = new String[5];
        System.arraycopy(src, 0, dest, 0, 4);
        for (String str : dest) {
            System.out.println(str);
        }
        System.out.println("=========华丽的分割线=========");
        System.arraycopy(src, 0, src, 1, 3);
        for (String str : src) {
            System.out.println(str);
        }
    }
}

Console output result:

hello
huang
bao
kang
null
=========华丽的分割线=========
hello
hello
huang
bao

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