技巧一：//統計字符串s1的頻率

    String s1 = in.nextLine();
//統計字符串s1的頻率
        for (char c1 : s1.toCharArray()) {
            if (hashMap1.containsKey(c1)) {
                hashMap1.put(c1, hashMap1.get(c1) + 1);
            } else {
                hashMap1.put(c1, 1);
            }
        }

技巧二：輸入判斷加 hasNext()

 Scanner scan=new Scanner(System.in);
        while(scan.hasNext()){
            String str1=scan.nextLine();
            String str2=scan.nextLine();
            boolean result=isContain(str1,str2);
            if(result){
                System.out.println("Yes");
            }else{
                System.out.println(
 
"No");
            }
        }
        scan.close();

校招筆試題編程技巧總結