蓝桥杯算法训练字符串变换

谁践踏了优雅 2022-05-31 00:10 225阅读 0赞

![这里写图片描述][SouthEast]

import java.util.Scanner;
    public class Main {
    
        public static void change1(String str) {
            System.out.println(str.toUpperCase());
        }
    
        public static void change2(String str) {
            System.out.println(str.toLowerCase());
        }
    
        public static void change3(String str) {
            char[] arr = str.toCharArray();
            for(int i = arr.length - 1;i >= 0;i --) {
                System.out.print(arr[i]);
            }
            System.out.println();
        }
    
        public static void change4(String str) {
            String t = "";
            char[] arr = str.toCharArray();
            for(int i = 0;i < arr.length;i ++) {
                if(arr[i] <= 90 && arr[i] >=65) {
                    t += (char)(arr[i] + 32);
                }else {
                    t += (char)(arr[i] - 32);
                }
            }
            System.out.println(t.trim());
        }
    
        public static void change5(String str) {
            String t = "";
            str = str.toLowerCase();
            char[] arr = str.toCharArray();
            for(int i = 0; i < arr.length; i++) {
                if(i == 0) {
                    t += arr[0];
                } else if(i != arr.length - 1) {
                    if(arr[i] != arr[i - 1] + 1 || arr[i] != arr[i + 1] - 1) {
                        t += arr[i];
                    } else if(arr[arr.length - 1] != '-') {
    // System.out.println(t.charAt(t.length() - 1));
                        if(t.charAt(t.length() -1) != '-') {
                            t += '-';
                        }else {
                            continue;
                        }   
                    }
                } else {
                    t += arr[i];
                }
            }
            System.out.println(t.trim());
        }
    
        public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            int num = sc.nextInt();
            String str = sc.nextLine();
            if(num == 1) {
                change1(str);
            }else if(num == 2) {
                change2(str);
            }else if(num == 3) {
                change3(str);
            }else if(num == 4) {
                change4(str);
            }else {
                change5(str);
            }
        }
    }

[SouthEast]: /images/20220531/acbbb5537fe14e7aa557f821055c3953.png