练习-指定格式拼接字符串和统计输入的字符串中各种字符的个数

练习-指定格式拼接字符串

题目:
定义一个方法，把数组{1,2,3}按照指定格式拼接成一个字符串。格式参照如下:[ word1#word2#word3 ]

public static void main(String[] args) {
        int[ ]array = {1,2,3};
        String result = fromArrayTostring( array ) ;
        System.out.println(result);
    }
    public static String fromArrayTostring(int[ ] array) {
        String str = "[";
        for (int i = 0; i < array.length; i++) {
            if (i == array.length - 1) {
                str += "word" + array[i] + "]";
            } else {
                str = "word" + array[i] + "#";
            }
        }
        return str;
    }

 

练习-统计输入的字符串中各种字符的个数

题目:
键健盘输入一个字符串,并且统计其中各种字符出现的次数。种类有:大写字母、小写字母、数字、其他

public static void main(String[ ]args) {
            Scanner sc = new Scanner(System.in);
            System.out.println("请输入一个字符串:");
            String input = sc.next();//获取键盘输入的一个字符串

            int countUpper = 0; //大写字母
            int countLower = 0;//小写字母
            int countNumber = 0; //数字
            int countOther = 0; //其他字符

            char[] charArray = input.toCharArray();
            for (int i = 0; i < charArray.length; i++) {
                char ch = charArray[i]; //当前单个字符
                if ('A' <= ch && ch <= 'Z') {
                    countUpper++;
                } else if ('a' <= ch && ch <= 'z') {
                    countLower++;
                } else if ('0' <= ch && ch <= '9') {
                    countNumber++;

                } else {
                    countOther++;
                }
                System.out.println("大写字母有:" + countUpper);
                System.out.println("小写字母有:" + countLower);
                System.out.println("数字有:" + countNumber);
                System.out.println("其他字符有:" + countOther);
            }
        }