Test.java

package com.litesuits.http.sample;

/**
 * @author 氢一 @http://litesuits.com
 * @date 2016-06-16
 */

public class Test {
    public static void main(String[] args) {
        String s = null;
        String b = null;
        String sb = s + b;
        System.out.println(sb);
    }
}