IfHanZi --判断字符串中是否包含汉字

public class IfHanZi { 
 
public static void main(String[] args) { 
//
String s1 = "我是中国人"; 
String s2 = "imchinese"; 
String s3 = "im中国人";
String s4="中国";
System.out.println(s1 + ":" + new String(s1).length()); 
System.out.println(s2 + ":" + new String(s2).length()); 
System.out.println(s3 + ":" + new String(s3).length()); 
System.out.println((s1.getBytes().length == s1.length()) ? "s1无汉字":"s1有汉字"); 
System.out.println((s2.getBytes().length == s2.length()) ? "s2无汉字":"s2有汉字"); 
System.out.println((s3.getBytes().length == s3.length()) ? "s3无汉字":"s3有汉字");
boolean flag=false;
flag=s1.contains(s4);
System.out.println(flag+":是否包含？");