System.arraycopy method usage

System.arraycopy method uses

System provides a static methodarraycopy(), 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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