JAVA---String,StringBuilder方法练习

package Xiti01;

import lombok.Cleanup;
import sm.util.InputUtil;

import java.util.Arrays;
import java.util.Scanner;

public class Demo04 {
    public static void main(String[] args) {
        test11();

    }

    private static void test11() {
//去除重复
        String str = "鸡鸡鸡鸡.......你你.....太太太太....美美美美...";
        System.out.println(str.replaceAll("\\.+", "").replaceAll("(.)\\1+","$1"));
    }

    private static void test10() {
        //用户录入文件例如as.jpg   a1.txt等可多次录入，最后输出以jpg结尾的文件
        Scanner input = new Scanner(System.in);
        StringBuilder builder = new StringBuilder();
        String regex = "^[\\w]+\\.[a-z]{2,}$";
        String next = null;
        String answer = null;
        do {
            while (true) {
                System.out.println("请录入文件：");
                next = input.next();
                if (!next.matches(regex)) {
                    System.out.println("录入不合法，请重新录入");
                    continue;
                }
                builder.append(next);
                builder.append(",");
                break;
            }
            System.out.println("是否继续录入:y/n");
            answer = input.next();
        } while ("y".equals(answer));
        String s1 = builder.toString();
        String[] split = s1.split(",");
        for (String s : split) {
            if (s.endsWith(".jpg")) {
                System.out.println(s);
            }
        }
    }

    private static void test9() {


        String str = "awda.jpg,wda,spn,11.jpg,sada.txt";
        String[] split = str.split(",");
        for (String s : split) {
            if (s.endsWith(".jpg")) {
                System.out.println(s);
            }
        }

    }

    private static void test8() {
        System.out.println("欢迎使用共享单车系统");
        System.out.println("1.投放单车");
        System.out.println("2.查看全部单车");
        System.out.println("3.删除单车");
        System.out.println("4.借出单车");
        System.out.println("5.归还单车");
        System.out.println("6.排行榜");
        System.out.println("7.退出");

        test7();
    }

    private static void test7() {
        int chose = InputUtil.inputStr("请选择操作", "^[1-7]{1}$");
    }

    private static void test6() {
        //每次录入两个字母，可多次录入，最后判断a的个数
        @Cleanup
        Scanner input = new Scanner(System.in);
        String regex = "^[A-Za-z]{2}$";
        StringBuilder builder = new StringBuilder();

        while (builder.length() < 6) {
            System.out.println("每次录入两个字母");
            String str = input.nextLine();
            if (!str.matches(regex)) {
                System.out.println("录入不合法,请重新录入");
                continue;
            }
            builder.append(str);

        }
        String str2 = builder.toString();
        System.out.println(str2);
        str2 = str2.toLowerCase();
        String str3 = str2.replaceAll("a", "");
        System.out.println("a的个数为:" + (builder.length() - str3.length()));
    }

    private static void test5() {
        //求字符串里面有多少个abc
        String str = "abcdasdsabcasdwadabcabcdasaw";
        String s = str.replaceAll("abc", "HH");
        int i = str.length() - s.length();
        System.out.println(i);
        String[] a1 = str.split("abc", -1);
        System.out.println(a1.length - 1);
        int count = 0;
        int fromIndex = 0;
        while (true) {
            int index = str.indexOf("abc", fromIndex);
            if (index == -1) {
                break;
            }
            fromIndex = index;
            fromIndex = fromIndex + 3;
            count++;
        }
        System.out.println(count);

    }

    private static void test4() {
        //去除字符串之间的空格
        String str = "  a  b    c    d   ";
        String s = str.replaceAll("\\s+", "");
        System.out.println(s);

    }

    private static void test3() {
        //给定数组将数组元素拼接成字符串，不使用toString()
        int[] arr = {1, 2, 3};
        //使用toString()
        System.out.println(Arrays.toString(arr));
        //未使用
        StringBuilder stringBuilder = new StringBuilder();
        int length = stringBuilder.length();
        stringBuilder.append("[");
        for (int i = 0; i < arr.length; i++) {
            stringBuilder.append(arr[i]);
            if (i == arr.length - 1) {
                stringBuilder.append("]");
                break;
            } else {
                stringBuilder.append(", ");
            }
        }
        System.out.println(stringBuilder);

    }

    private static void test2() {
        //获得文件信息：盘，文件路径，文件名，txt
        String path = "D:\\yuanshen\\原神\\Genshin Impact\\yuanshen.txt";
        int indexOf = path.indexOf("\\");
        int lastIndexOf1 = path.lastIndexOf("\\");
        int lastIndexOf2 = path.lastIndexOf(".");
        System.out.println("盘:" + path.substring(0, indexOf));
        System.out.println("文件路径:" + path.substring(indexOf + 1, lastIndexOf1 + 1));
        System.out.println("文件名:" + path.substring(lastIndexOf1 + 1, lastIndexOf2));
        System.out.println("txt:" + path.substring(lastIndexOf2 + 1));
    }

    private static void test1() {
        String str1 = "dasda";
        String str2 = "dasda";
        
        char[] chars1 = str1.toCharArray();
        char[] chars2 = str2.toCharArray();
        boolean flag = Arrays.toString(chars1).equals(Arrays.toString(chars2));
        if (!flag) {
            System.out.println("不相等");
        } else System.out.println("相等");
    }
}