package com.qishon.iss.qop.common;

public class StringShitJudge {
 public static void main(String[] args) {

 String sex = null;
 System.out.println("我的性别是" + judge(sex));
 }

 /**
 * toString()、String.valueOf()、(String)
 * @param sex
 * @return
 */
 private static String judge(Object sex) {
 if (String.valueOf(sex) != null) {
 //do something...
 return String.valueOf(sex);
 }
 return "";
 }
}