使用System.arraycopy拷贝数组

使用System.arraycopy拷贝数组

TestArrayCopy.java

/*
	使用System.arraycopy拷贝数组
	使用java.lang.System类的静态方法arraycopy
*/
public class TestArrayCopy {
  public static void main(String args[]) {
    String[] s = {"Mircosoft","IBM","Sun","Oracle","Apple"};
    String[] sBak = new String[6];
	//拷贝数组System.arraycopy
    System.arraycopy(s,0,sBak,0,s.length);
    
    for(int i=0;i<sBak.length;i++){
      System.out.print(sBak[i]+" ");
    }
    System.out.println();
	
    int[][] intArray = {{1,2},{1,2,3},{3,4}};
    int[][] intArrayBak = new int[3][];
	
	//拷贝数组System.arraycopy
    System.arraycopy(intArray,0,intArrayBak,0,intArray.length);
	
	//intArray和intArrayBak操作的值是同样的值
	//改变intArrayBak的值
    intArrayBak[2][1] = 100;
    
	//intArray中对应的值同样改变了
    for(int i = 0;i<intArray.length;i++){
        for(int j =0;j<intArray[i].length;j++){
            System.out.print(intArray[i][j]+"  "); 
        }
        System.out.println();
    }
  }
}

F:\java>javac TestArrayCopy.java

F:\java>java TestArrayCopy
Mircosoft IBM Sun Oracle Apple null
1  2
1  2  3
3  100

F:\java>