查找字符串中所有不重复的字符

Question

你能帮我加入这个 java 程序吗？我有两个字符串，我需要确定没有重复字母的字符是什么。输入是：热爱生活输出将是： ovif

它将删除所有具有重复的字符。

这是我的代码，但它只打印并找到重复的字母。

public static void main(String[] args) {
    Map<Character, Integer> map = new HashMap<Character, Integer>(); 

    input = new Scanner(System.in);
    String aw, bw;

    System.out.println("Input First Word: ");
    aw=input.next();
    System.out.println("Input Second Word: ");
    bw=input.next();
    String s = aw+bw;
    char[] chars = s.toCharArray();

    for(Character ch:chars){
      if(map.containsKey(ch)){
         map.put(ch, map.get(ch)+1);
      } else {
         map.put(ch, 1);
      }
    }

    Set<Character> keys = map.keySet();


    for(Character ch:keys){
      if(map.get(ch) > 1){
        System.out.println(ch+" ");
      }
    }
}

我想打印它在那个程序中删除的字符。

Answer 1

for(Character ch:keys){
  if(map.get(ch) == 1){
    System.out.println(ch+" ");
  }
}

将打印出出现一次的所有字符。您将两个字符串中的每个字符都添加到映射中，因此只出现一次的字符的值为 1。

Answer 2

A Set 非常适合检查历史记录。

public void test() {
    String s = "love life";
    Set<Character> unique = new HashSet<>();
    Set<Character> duplicate = new HashSet<>();
    for (char c : s.toCharArray()) {
        // Have we seen this one before already.
        if (!duplicate.contains(c)) {
            if (!unique.add(c)) {
                // It was already there.
                unique.remove(c);
                // Mark it as duplicate.
                duplicate.add(c);
            }

        }
    }
    System.out.println("Unique:" + Arrays.toString(unique.toArray(new Character[0])));
}

操作 Sets 很简单：

Set<Character> inString(String s) {
    Set<Character> in = new HashSet<>();
    for (char c : s.toCharArray()) {
        in.add(c);
    }
    return in;
}

public void test() {
    Set<Character> inFirst = inString("glass");
    Set<Character> inSecond = inString("bass");
    Set<Character> inFirstButNotInSecond = new HashSet<>(inFirst);
    inFirstButNotInSecond.removeAll(inSecond);
    System.out.println("In first but not in second:" + inFirstButNotInSecond);
}

查找字符串中所有不重复的字符

find all non repeated character in a string

java

arrays

string

character