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import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @Auther: truedei
 * @Date: 2020 /20-5-6 22:46
 * @Description:
 */
public class TestA {

    static public String replaceSpace(String s) {
        //1693648ÄÉÃë
        return s.replaceAll("[ ]", "%20");

        //1355205ÄÉÃë
        return s.replace(" ","%20");


        //636976ÄÉÃë
        StringBuilder s1 = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            if(s.charAt(i)==(char)' '){
                s1.append("%20");
            }else {
                s1.append(s.charAt(i));
            }
        }
        return s1.toString();

        //594273ÄÉÃë
        String s1="";
        for (int i = 0; i < s.length(); i++) {
            if(s.charAt(i)==(char)' '){
                s1=s1+"%20";
            }else {
                s1=s1+s.charAt(i);
            }
        }
        return s1;
    }

}