String Manipulator 2 - Str. manipulations(str.endsWith())

package com.company;

import javafx.util.Pair;

import javax.xml.crypto.dsig.keyinfo.KeyValue;
import java.lang.reflect.Array;
import java.security.KeyStore;
import java.text.Collator;
import java.text.DecimalFormat;
import java.util.*;
import java.util.function.Predicate;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collector;
import java.util.stream.Collectors;


public class Main {

    public static boolean checkEnd(String inputStr, String endStr){
        int startIdx = inputStr.length() - endStr.length();
        String end = inputStr.substring(startIdx);
        return end.equals(endStr);
    }
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String string = scanner.nextLine();
        StringBuilder builder = new StringBuilder(string);

        String input = "";
        while (!"Done".equals(input = scanner.nextLine())){
            String[] tokens = input.split(" ");
            String command = tokens[0];

            switch (command){
                case "Change":
                    String character = tokens[1];
                    String replacement = tokens[2];
                    builder = new StringBuilder(builder.toString().replace(character, replacement));
                    System.out.println(builder.toString());
                    break;
                case "Includes":
                    String includeStr = tokens[1];
                    if(builder.toString().contains(includeStr)){
                        System.out.println("True");
                    }else{
                        System.out.println("False");
                    }
                    break;
                case "End":
                    String endStr = tokens[1];
                    if(checkEnd(builder.toString(), endStr)){
                        System.out.println("True");
                    }else{
                        System.out.println("False");
                    }
                    break;
                case "Uppercase":
                    builder = new StringBuilder(builder.toString().toUpperCase());
                    System.out.println(builder.toString());
                    break;
                case "FindIndex":
                    String findChar = tokens[1];
                    System.out.println(builder.toString().indexOf(findChar));
                    break;
                case "Cut":
                    int startIndex = Integer.parseInt(tokens[1]);
                    int length = Integer.parseInt(tokens[2]);
                    builder = new StringBuilder(builder.toString().substring(startIndex, startIndex + length));
                    System.out.println(builder.toString());
                    break;
            }
        }

    }
}