检查一个字符串是否包含另一个字符串的所有字符[已关闭]

Question

String one = "This is a test";
String two = "This is a simple test";

我想检查两个代码是否包含一个代码中的所有字符，并忽略它有额外字符的事实。

Answer 1

在第一个字符串中的字符集上使用简单循环：

String s1 = "This is a test";
String s2 = "This is a simple test";
Set<Character> chars = new HashSet<Character>();
for(int i = 0; i < s1.length(); i++) {
    chars.add(s1.charAt(i));
}


for (Iterator<Character> iterator = chars.iterator(); iterator.hasNext();) {
    Character character = iterator.next();
    if(!s2.contains(character.toString())) {
        // break and mark as not contained
        break;
    }
}

如果要检查单词，则可以将空格周围的字符串拆分为单词列表：

String[] words1 = s1.split("\\s");
String[] words2 = s2.split("\\s");

List<String> wordList1 = Arrays.asList(words1);
List<String> wordList2 = Arrays.asList(words2);
System.out.println(wordList2.containsAll(wordList1));

Answer 2

static boolean stringContains(String longer, String shorter) {
    int i = 0;
    for (char c : shorter.toCharArray()) {
        i = longer.indexOf(c, i) + 1;
        if (i <= 0) { return false; }
    }
    return true;
}

Answer 3

最快的方法可能是将它们分解为HashSets，然后应用containsAll

public static Set<Character> stringToCharacterSet(String s) {
    Set<Character> set = new HashSet<>();
    for (char c : s.toCharArray()) {
        set.add(c);
    }
    return set;
}

public static boolean containsAllChars
    (String container, String containee) {
    return stringToCharacterSet(container).containsAll
               (stringToCharacterSet(containee));
}

public static void main(String[] args) {
    String one = "This is a test";
    String two = "This is a simple test";
    System.out.println (containsAllChars(one, two));
}