java Arrays的复制

直接看代码吧：

import java.util.Arrays;

public class Arraytest {
	public static void main(String[] args) {
		System.out.println(Arrays.toString(args));
		String[] copy = Arrays.copyOf(args, 4);
		System.out.println(Arrays.toString(copy));
		copy[0] = "A";
		copy[1] = "B";
		copy[2] = "c";
		copy[3] = "D";
		System.out.println(Arrays.toString(args));
		System.out.println(Arrays.toString(copy));
		
		int data[] = {1,2,3,4,5,6};
		printDate(data);
		int[] data2 = Arrays.copyOf(data, 7);
		data2[6] = 10;
		printDate(data2);
		int[] data3 = Arrays.copyOf(data, 10);
		printDate(data3);
	}
	
	private static void printDate(int[] data){
		StringBuffer buffer = new StringBuffer("[");
		for(int i=0;i<data.length;i++){
			buffer.append(data[i]);
			if(i<data.length-1){
				buffer.append(",");
			}
		}
		buffer.append("]");
		System.out.println(buffer.toString());
	} 
	
}	

 

输出结果：

[]
[null, null, null, null]
[]
[A, B, c, D]
[1,2,3,4,5,6]
[1,2,3,4,5,6,10]
[1,2,3,4,5,6,0,0,0,0]