Question

You will write three static methods to manipulate an input String in different ways using various String methods. You need to provide the code for each of the three static methods in class StringPlay (requirements for each listed below). You will also change the control statement in the test harness to allow for variations in the sentinel value. You need to modify the loop control condition in Lab09.java so that user inputs of ‘finish’, “FINISH”, “FiniSH”, “fINISH”, etc. will end the loop.

Requirements a) Add the necessary code to StringPlay.java: Method countWords 1. Receives a String value containing the user-input phrase passed from Lab09.java 2. Separates the phrase into individual words 3. Returns an int value containing a count of the individual words in the phrase Method changeToUppercase 1. Receives a String value containing the user-input phrase passed from Lab09.java 2. Declares a StringBuilder object 3. Separated the phrase into individual words, storing those words in an array of String type 4. Beginning with the first entry in the array, appends each word with all letters changed to uppercase (and a following space) to the StringBuilder object 5. Returns the StringBuilder object Method findMiddleWord 1. Receives a String value containing the user-input phrase passed from Lab09.java 2. Determines the number of words in the String 3. Finds the 'middle' word 4. Returns the String representing the middle or center word in the String

// This is a test harness for Lab09.

import java.util.Scanner;

public class Lab09
{
public static void main( String[] args)
{
    Scanner input = new Scanner( System.in );   
    String finish = "Finish";                    
  
    System.out.printf("%nEnter a phrase containing at least three words%nOr enter finish to stop" );
  
    String newPhrase = input.nextLine();
  
    // You need to change the control condition here
    while( newPhrase != finish )
    {
      // Call static methods of class StringPlay
      System.out.printf("Your phrase contains %d words.", StringPlay.countWords( newPhrase ) );
      System.out.printf("%nYour phrase with all letters in uppercase: %s",
                        StringPlay.changeToUppercase( newPhrase ) );
      System.out.printf("%nThe middle word of your phrase is: %S%n%n",
                        StringPlay.findMiddleWord( newPhrase ) );
    
      System.out.printf("%nEnter a phrase containing at least three words%nOr enter finish to stop" );

      newPhrase = input.nextLine();
    }
  
}

}

// This is a 'helper' class for Lab09.

public class StringPlay
{

// Static method to count the words in the input String
public static int countWords( String phrase )
{

}

// Static method to change all letters in the input String to uppercase
public static StringBuilder changeToUppercase( String phrase )
{

}

//Static method to find middle word of the input String
public static String findMiddleWord( String phrase )
{

}

}

Answer 1

StringPlay.java

class StringPlay   
{
int countWords(String str) // checks how many number of words present in a string
{
int count=1;
for(int i=0;i<str.length()-1;i++)
if((str.charAt(i)==' ') && (str.charAt(i+1)!=' '))
count++;
return count; // return number of words
}

String ToUppercase(String str) // convert string to uppercase
{
StringBuilder sb = new StringBuilder(); // creating object of StringBuilder class
String strArray[] = str.split(" "); // store words in the string into string array
for (String s : strArray)
sb.append(s).append(" "); // append array data into Stringbuilder object
sb.deleteCharAt(sb.length() - 1);
for(int i = 0 ; i < sb.length() ; i++)
if(sb.charAt(i) >= 97 && sb.charAt(i) <=122) // check for small case letter ... ascii code of "a" is 97 ... "z" is 122.
sb.setCharAt(i, (char)(sb.charAt(i)-32)); // The character at the specified index is set to to uppercase
return sb.toString(); // return uppercase string
}

String findMiddleWord(String str) // finds the middle word from the string
{
String array[]=str.split(" "); // stores words in the string into array
int temp=array.length; // count array length
if(temp%2==0)
return array[temp/2-1]; // returns middle word
else
return array[temp/2]; // returns middle word
}

} // close class

Lab09.java

import java.util.Scanner; // import Scanner class from java.util package

public class Lab09
{
public static void main( String[] args) // main method
{
StringPlay sp=new StringPlay(); // creating the object of StringPlay class
Scanner input = new Scanner( System.in ); // creaing Scanner object

System.out.printf("%nEnter a phrase containing at least three words%nOr enter finish to stop" );
  
String newPhrase = input.nextLine(); // get input from user
String a="finish";
// You need to change the control condition here
while(newPhrase != a)
{
// Call static methods of class StringPlay
System.out.printf("Your phrase contains %d words.", sp.countWords( newPhrase.trim() ) ); // calls countWords() method
System.out.printf("%nYour phrase with all letters in uppercase: %s",
sp.ToUppercase( newPhrase.trim() ) ); // calls ToUppercase() method
System.out.printf("%nThe middle word of your phrase is: %S%n%n",
sp.findMiddleWord( newPhrase.trim() ) ); // calls findMiddleWord() method

System.out.printf("%nEnter a phrase containing at least three words%nOr enter finish to stop" );

newPhrase = input.nextLine();
newPhrase=newPhrase.trim();

}
  
} // end of main

} // end of class

Output

C:\Users\AKSHAY\Desktop>javac StringPlay.java

C:\Users\AKSHAY\Desktop>javac Lab09.java

C:\Users\AKSHAY\Desktop>java Lab09

Enter a phrase containing at least three words
Or enter finish to stop Each day provides its own gifts
Your phrase contains 6 words.
Your phrase with all letters in uppercase: EACH DAY PROVIDES ITS OWN GIFTS
The middle word of your phrase is: PROVIDES

Enter a phrase containing at least three words
Or enter finish to stop Information systems department
Your phrase contains 3 words.
Your phrase with all letters in uppercase: INFORMATION SYSTEMS DEPARTMENT
The middle word of your phrase is: SYSTEMS

C: \Users IAKSHAY\Desktop javac StringPlay-java C: \Users IAKSHAY\Desktop javac Labe9.java c: \Users\AKSHAY\Desktop>java Labe9 Enter a phrase containing at least three words or enter finish to stop Each day provides its own gifts Your phrase contains 6 words. Your phrase with all letters in uppercase: EACH DAY PROVIDES ITS OWN GIFTS The middle word of your phrase is: PROVIDES Enter a phrase containing at least three words r enter finish to stop Information systems department our phrase contains 3 words. our phrase with all letters in uppercase INFORMATION SYSTEMS DEPARTMENT The middle word of your phrase is: SYSTEMS