System.arraycopy方法解释

数组拷贝

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

public class ArrayCopyTest {

        public static void main(String[] args) {
            char[] src = new String("hellow").toCharArray();
            char[] dest = new String("12345789").toCharArray();

            System.out.print("src源数组为：");
            for(char c : src){
                System.out.print(c);
            }

            System.out.print("\ndest目标数组为：");
            for(char c : dest){
                System.out.print(c);
            }

            /*
             * 开始执行数组复制操作
             * 将源数组['h','e','l','l','o','w']从数组下标0开始的4位长度的数组['h','e','l','l']
             * 复制到目标数组['1','2','3','4','5','6','7','8'],从下标为3的位置开始
             */
            System.arraycopy(src,0,dest,3,4);

            System.out.print("\n复制完成之后的目标数组为：");
            for(char c : dest){
                System.out.print(c);
            }
        }
    }

原文地址：https://segmentfault.com/a/1190000017271507?utm_source=tag-newest