Question

在java中如何用循环查找和删除重复的字符

在String a ="abcqwebca"中查找删除重复的字符 输出 “abcqwe”

Answer 1

public static void main(String[] args) {

String str = "腊搜asgsadd";
removeDuplicate3(str);
}
//轮戚历去除重复字符仔羡
private static void removeDuplicate3(String s) {
if (s == null){
return;
}

if (s.length() < 2){
}

char[] ch = s.toCharArray();
int count =0;
int p = 0;
int len = s.length();
for (int i = 0; i < len; i++) {
if (ch[i] != ' ') {
for (int j = i + 1; j < len; j++)
if (ch[j] == ch[i]) {
ch[j] = ' ';
}
ch[p++] = ch[i];
System.out.print(ch[i]);
}
}
}

Answer 2

class Main{
    public static String rev(String str){
        if(str.isEmpty()) return "";
        char c=str.charAt(str.length()-1);
        String last=str.substring(0,str.length()-1);
        if(last.indexOf(c)==-1){
   烂辩核         return rev(last)+c;
        }else {
       饥掘     return rev(last);
        }
    }
    public static void main(String[] args){
    灶晌    System.out.println(rev("abcqwebca"));
    }
}