System类-arraycopy()

二 代码

/**
* Created by hanshan on 2017/1/7 0007.
*
* 把数组1的{3，4，5}替换到数组2首部
*/
public class arraycopyDemo {
public static void main(String[] args){
int[] arr={1,2,3,4,5};
int[] arr2={6,7,8,9,45};
System.arraycopy(arr,2,arr2,0,3);
System.out.println(Arrays.toString(arr));
System.out.println(Arrays.toString(arr2));
}
}