Question

String Mutator: Can you guy finish the last 2 method for me and correct me if I have any mistake. It is due in the next 2 hours. Thank you!

//use equals ( ) to determine equality of string phrases

//use compareTo( ) to determine which comes first alphabetically

The code is below and it need to be written in Java language.

/**
* Programmer:
*Date:
* StringMutation works with string methods, printing length, 1st half, 2nd half, middle 3
* characters, switch 1st & 2nd halfs, replace a character, use compareTo & equals
*Strings are immutable so need new variables to store modified versions of strings
*/
public class StringMutation
{
public static void main(String[] args)
{
String myString = new String("This is a test String.");
String myString2 = "This is a second test String.";

int phraseLength, middleIndex;
String firstHalf, secondHalf, switchPhrase, middle3;
char charMid,
//manipulation of myString (If you would like more practice, repeat for myString2)
//determine and store length
phraselength = myString.length();

//find and store middleIndex
middleIndex = phraseLength / 2;

//store first half
firstHalf = myString.substring(O,middleIndex);

//store second half (can be done 2 ways)
secondHalf = myString.substring(middleIndex, phraseLength -1) ;
//place first half at end of second half
switchPhrase = secondHalf.concat (firstHalf);
//find the middle 3 characters
middle3 = myString.substring(middleIndex - 1, middleIndex + 2);

//print the following:
//original phrase
system.out.printlnt("Original phrase: " + myString);

//length of phrase
system.out.println(" Length of phrase: " + phraseLength);
//middle index
system.out.println(" index of the middle: " + middleindex);
//character at middle index
charMid = myString.charAt (middleIndex);
//replace all spaces with @
system.out.println("Replace [spaces]: " + myString.replace(' ','@'));
  
//switched string (secondHalf firstHalf)

//use equals( ) to determine equality of string phrases
//use compareTo( ) to determine which comes first alphabetically

Answer 1

Here is an error free java code with last methods implemented :

import java.util.*;
import java.lang.*;
import java.io.*;


class StringMutation{
        public static void main(String[] args) {
        String myString = new String("This is a test String.");
        String myString2 = "This is a second test String.";

        int phraseLength,middleIndex;
        String firstHalf, secondHalf, switchPhrase, middle3;
        char charMid;
        //manipulation of myString (If you would like more practice, repeat for myString2)
        //determine and store length
        phraseLength = myString.length();

        //find and store middleIndex
        middleIndex = phraseLength / 2;

        //store first half
        firstHalf = myString.substring(0, middleIndex);

        //store second half (can be done 2 ways)
        secondHalf = myString.substring(middleIndex, phraseLength - 1);
        //place first half at end of second half
        switchPhrase = secondHalf.concat(firstHalf);
        //find the middle 3 characters
        middle3 = myString.substring(middleIndex - 1, middleIndex + 2);


        //print the following:
        //original phrase
        System.out.println("Original phrase: " + myString);

        //length of phrase
        System.out.println(" Length of phrase: " + phraseLength);
        //middle index
        System.out.println(" index of the middle: " + middleIndex);
        //character at middle index
        charMid = myString.charAt(middleIndex);
        //replace all spaces with @
        System.out.println("Replace [spaces]: " + myString.replace(' ', '@'));

        System.out.println("Switched Phrase: " + switchPhrase);

        //use equals( ) to determine equality of string phrases
        boolean isEqual = myString.equals(myString2);
        System.out.println("String 1 : " + myString);
        System.out.println("String 2 : " + myString2);
        System.out.println("String Equal : " + isEqual);

        String s3 = "This is a test String.";
        System.out.println("String 1 : " + myString);
        System.out.println("String 2 : " + s3);
        isEqual = myString.equals(s3);
        System.out.println("String Equal : " + isEqual);


        //use compareTo( ) to determine which comes first alphabetically
                // if s1 > s2, it returns positive number  
                // if s1 < s2, it returns negative number  
                // if s1 == s2, it returns 0  
        String s1 = "abc";
        String s2 = "def";

        int v = s1.compareTo(s2);
        if(v==0){
                System.out.println(s1 + " is equal to " + s2 );
        }else if(v>0){
                System.out.println(s1 + " is greater than " + s2 );
        }else{
                System.out.println(s1 + " is less than " + s2 );
        }

    }
}

Output :