Base

 

 

package com.com.onetest;

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;

public class Base {

    public static void main(String[] args) {
        testReplace();
        System.out.println("begin");     
    }

    private static void testReplace() {
        Pattern pattern = Pattern.compile("(A|B)+");
        boolean res1 = pattern.matcher("ABA").matches();
        boolean res2 = pattern.matcher("ABAC").matches();
        System.out.println(res1);
        System.out.println(res2);

        String input = "123abc123456";
        String res3 = input.replace('1', '2');
        String res4 = input.replaceAll("\\d+", "x");
        String res5 = input.replaceAll("(123|456)", "x");
        System.out.println(res3);
        System.out.println(res4);
        System.out.println(res5);

        Map<Integer, String> map = new HashMap<>();
        map.put(10, "100");
        map.put(10, "1000");
        boolean res = map.containsKey(10);
        String value = map.get(10);
        System.out.println("res:" + res);
        System.out.println(value);

        map.remove(10);
        value = map.get(10);
        System.out.println(value);
    }
}