(三)数组的复制

package com;

import java.util.Arrays;

/**

 * 数组的复制

 */

public class Demo04 {

public static void main(String[] args) {

int[] ary1 = {5,6,7};

//复制数组

int[] ary2 = new int[ary1.length];

for(int i=0; i<ary1.length; i++){

ary2[i] = ary1[i];

}

System.out.println(Arrays.toString(ary2));//[15, 6, 7]

//Java 提供了复制数组的API, 可以简化复制,提高性能

int[] ary3 = new int[ary1.length];

//              源, 源位置,目标,目标位置,数量

System.arraycopy(ary1, 0, ary3, 0, ary1.length);

System.out.println(Arrays.toString(ary3)); //[15, 6, 7] 

//Arrays.copyOf() 方法更加便捷的复制数组, Java 5+

// Arrays.copyOfRange(original, from, to)

//Arrays.copyOf(original, newLength)

int[] ary4 = Arrays.copyOf(ary1, ary1.length);

System.out.println(Arrays.toString(ary4));//[15, 6, 7]

}

}