数组的复制

public class test{

    public static void main (String [] args)

    {

        System.out.println("==========一维数组=====================");

        //一维数组

        String[] intArr= {"Mircosoft","IBM","Sun","Oracle","Apple"};

        String[] copyArr=new String[7];

        System.arraycopy(intArr,0,copyArr,2,intArr.length);  //要在源数组的0位置开始复制

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

        {

            System.out.print(copyArr[i]+"  ");

        }

        System.out.println();

        System.out.println("==========二维数组=====================");

        

        //二维数组

        int[][] arr = {{1,2},{1,2,3,5,3},{3,4},{2,78,98,0}};

        int[][] copy = new int[5][];

        System.arraycopy(arr,0,copy,0,arr.length);

       

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

            for(int j =0;j<arr[i].length;j++){

                System.out.print(arr[i][j]+"  "); 

            }

            //System.out.println();

        }

        System.out.println();

        //重新设置copy数组   ,两个数组都会改变，因为指向相同的内存地址

       

        copy[2][1]=100;

       

       for(int i=0;i<arr.length;i++){

            for(int j=0;j<arr[i].length;j++){

                System.out.print(arr[i][j]+"  ");

            }

       }

        

        

    }

}