判断一个字符串字符是否唯一

Posted 2022-12-04 bot攻略

package lishi;


import java.util.Scanner;


public class the_only_Z


public static void main(String[] args)
// TODO Auto-generated method stub
Scanner sc = new Scanner(System.in);
String str = sc.next();
if(ifUniqueChars(str))
System.out.println("This is a only character.");
else
System.out.println("This isn't a only character.");





public static boolean ifUniqueChars(String str)
int checker = 0;
for(int i = 0;i<str.length();i++)
int val = str.charAt(i)-'a';
if((checker&(1<<val))>0)return false;
checker|=(1<<val);

return true;