Question

JAVA, please help asap! Its due very soon and I cant figure it out

StringUtils

You are to complete the class StringUtils, which is below.

public static void genGauge(String currentString) {

System.out.println(currentString);

int c = 0;

int l = currentString.length();

String genGauge = "";

while(c < l) {

genGauge = genGauge + c;

if (c < 9) {c++;}

else {c = 0; l = l - 10;}

}

System.out.println(genGauge);

}

Add the following public static methods:

copy

Write a method String copy(String currentString, int startPosition, int onePastLastPosition). This method returns a substring of currentString, including startPosition, but ending before onePastLastPosition. For example, copy(“abcd”, 1, 3) returns the String “bc”

cut

Write a method String cut(String currentString, int startPosition, int onePastLastPosition). This method returns a String constructed by starting with currentString, and removes the letters starting with startPosition and stopping before onePastLastPosition. For example, cut(“abcd”, 1, 3) returns the String “ad”

paste

Write a method String paste(String currentString, int insertBefore, String stringToInsert). This method returns the String constructed by inserting stringToInsert into currentString before position insertBefore. For example, paste(“ad”, 1, “bc”) returns the String “abcd”

StringMangle

You are to write a class StringMangle that has only a main method. This program allows a user to enter a String that we’ll call currentString. It maintains another String that we’ll call clipboard. The program asks the user to enter currentString. It then uses a sentinel-controlled loop to ask the user to enter one of four commands:

c – copies part of currentString into clipboard using the copy method above. It asks the user for the starting and one-past the ending positions in currentString.

x – assigns a new value to currentString using the cut method above. It asks the user for the starting and one-past the ending positions in currentString.

v – assigns a new value to currentString using the paste method above to insert the clipboard into currentString. It asks the user for the starting position in currentString.

q – quits the program.

Notes

You may assume that the user enters valid input

Use Scanner’s next() method to read the currentString from the user. This means that we won’t have spaces in the currentString.

Use StringUtils.genGauge to output currentString to the user. It puts character positions (mod 10) underneath the currentString’s characters to help the user enter data. For example, System.out.println(StringUtils.genGauge(currentString));

Sample Output:

Enter a string

fghdeabc

The current string is

fghdeabc

01234567

Enter c to copy, x to cut, v to paste, q to quit

C

Enter the starting position

5

Enter one past the ending position

8

The current string is

fghdeabc

01234567

The clipboard is

abc and it has length of 3

Enter c to copy, x to cut, v to paste, q to quit

v

Enter the position the paste should come before

0

The current string is

abcfghdeabc

01234567890

The clipboard is

abc and it has length of 3

Enter c to copy, x to cut, v to paste, q to quit

c

Enter the starting position

6

Enter one past the ending position

8

The current string is

abcfghdeabc

01234567890

The clipboard is

de and it has length of 2

Enter c to copy, x to cut, v to paste, q to quit

v

Enter the position the paste should come before

3

The current string is

abcdefghdeabc

0123456789012

The clipboard is

de and it has length of 2

Enter c to copy, x to cut, v to paste, q to quit

x

Enter the starting position

8

Enter one past the ending position

13

The current string is

abcdefgh

01234567

The clipboard is

de and it has length of 2

Enter c to copy, x to cut, v to paste, q to quit

q

Answer 1

Program Screen Shot:

Sample Output:

Program Code to Copy:

public class StringUtils {
  
   public static void genGauge(String currentString) {
       System.out.println(currentString);
       int c = 0;
       int l = currentString.length();
       String genGauge = "";
       while(c < l) {
           genGauge = genGauge + c;
           if (c < 9) {c++;}
           else {c = 0; l = l - 10;}
       }
       System.out.println(genGauge);
       }
  
   // returns a substring of currentString, including startPosition, but ending before onePastLastPosition
   public static String copy(String currentString, int startPosition, int onePastLastPosition) {
       return currentString.substring(startPosition, onePastLastPosition);
   }
  
   // returns a String constructed by starting with currentString, and removes the letters starting with
   // startPosition and stopping before onePastLastPosition
   public static String cut(String currentString, int startPosition, int onePastLastPosition) {
       return currentString.substring(0,startPosition) +
           currentString.substring(onePastLastPosition,currentString.length());
   }
  
   // returns the String constructed by inserting stringToInsert into currentString before position insertBefore
   public static String paste(String currentString, int insertBefore, String stringToInsert) {
       return currentString.substring(0,insertBefore) + stringToInsert +
           currentString.substring(insertBefore,currentString.length());
   }

}

_______________________________________________________

import java.util.Scanner;

public class StringMangle {

   public static void main(String[] args) {
      
       Scanner input = new Scanner(System.in);
       // get string from console/user
       System.out.println("Enter a string: ");
       String currentString = input.next();
      
       String clipboard = ""; // initialize clipboard
       int startPosition, onePastLastPosition;
       String choice; // menu option
  
       // start sentinel-controlled loop
       do {
          
           System.out.println("The current string is");
           StringUtils.genGauge(currentString);
          
           if(clipboard.length()>0)
           System.out.println("The clipboard is \n"+ clipboard +" and it has a length of "+clipboard.length());
          
           System.out.println("Enter c to copy, x to cut, v to paste, q to quit");
           choice = input.next().toLowerCase(); // convert to lower for easy comparison in switch-case below
          
           switch(choice) {
           case "c": // copy
               System.out.println("Enter the starting position ");
               startPosition = input.nextInt();
               System.out.println("Enter one past the ending position ");
               onePastLastPosition= input.nextInt();
               clipboard = StringUtils.copy(currentString, startPosition, onePastLastPosition);
               break;
           case "x": // cut
               System.out.println("Enter the starting position ");
               startPosition = input.nextInt();
               System.out.println("Enter one past the ending position ");
               onePastLastPosition= input.nextInt();
               currentString = StringUtils.cut(currentString, startPosition, onePastLastPosition);
               break;
           case "v": // paste
               System.out.println("Enter the position the paste should come before ");
               startPosition = input.nextInt();
               currentString = StringUtils.paste(currentString,startPosition,clipboard);
               break;
           case "q": // will end sentinel-controlled loop
               break;
           default: // unknown input
               System.out.println("Invalid input");
               break;
           }
          
       }while(!choice.equals("q")); // loop again if choice is not q
   }

}

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