i哦i咯

package com.blog.global;

import java.util.Random;

public class GetRandom {
	int[] arr={0,1,2,3,4,5,6,7,8,9};
	Random random=new Random();
	StringBuffer stringBuffer=null;
	public String getRandom(){
		stringBuffer=new StringBuffer();
		for(int i=0;i<4;i++){
			stringBuffer.append(arr[random.nextInt(10)]);
		}
		return stringBuffer.toString();
	}
}