【LeeCode】求两个字符串的公共字符

【题目描述】

  打印两个字符串的公共字符

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【代码】

package com.company;
import java.util.*;

class Solution2 {

    public void minWindow(String s1, String s2) {
        char[] c1 = s1.toCharArray();
        char[] c2 = s2.toCharArray();

        Set<Character> set = new HashSet<>();
        Set<Character> set2 = new HashSet<>();

        for (char c : c1) {
            set.add(c);
        }
        
        for (char c : c2) {
            set2.add(c);
        }

        // 取交集的函数
        set.retainAll(set2);
        if (set.size() == 0 ){
            System.out.println("no common chars");
        }else{
            System.out.println(set);
        }

    }
}
public class Test {
    public static void main(String[] args) {
        String str = "ADOBECODEBANC";
        String sss = "ABC";
        new Solution2().minWindow(str, sss);
    }
}