判断字符串中是否有重复字母

package com.demo.four;import org.junit.Test;public class test {/** * 判断字符串中是否有重复字母 */@Testpublic void test(){System.out.println(checkDifferent("abcdefghijk"));}public boolean checkDifferent(String iniString){boolean isbool = false;char[] chars = iniString.toCharArray();for (int i = 0; i < chars.length; i++) {for (int j = i+1; j < chars.length; j++) {if(chars[i] == chars[j]){isbool = true;return isbool;}else {isbool = false;}}}return isbool;}}