题解 | #判断学生成绩#

import java.util.HashSet; import java.util.Iterator; import java.util.Scanner;

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

// 从键盘获取一串字符串，要求去除重复的字符。请使用HashSet解决这一问题 Scanner scanner = new Scanner(System.in); String str = scanner.nextLine(); scanner.close(); HashSet hs = new HashSet<>();

    //write your code here......
    Iterator<Character> iterator = hs.iterator();
    char[] chars = str.toCharArray();
    for (char ch:
         chars) {
        while (iterator.hasNext()) {
            Iterator<Character> next =  hs.iterator();
            if ( next.equals(ch) ){
                break;
            }
        }
        hs.add(ch);
    }


    for (char c:hs) {
        System.out.print(c);
    }
}

}