Question

/*
 * CPS150_Lab10.java
 */

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

/**
 * CPS 150, Fall 2018 semester
 *
 * Section N1
 * 
 * Lab Project 13: Comparing Java Strings
 *
 * @author *** Replace with your name ***
 */

public class CPS150_Lab13
{
  static final Scanner KBD = new Scanner(System.in);
  static final PrintStream OUT = System.out;
  
  // TO DO: Implement each of the following 4 methods,
  //        using the String compareTo method:
  
  /*
   * lessThan(String, String) -> boolean
   * 
   * method is passed two Strings
   * method returns true if the first String is less than the second String
   *  otherwise, the method returns false
   */
  
  /*
   * lessThanOrEquals(String, String) -> boolean
   * 
   * method is passed two Strings
   * method returns true if the first String is less than or equal to the second String
   *  otherwise, the method returns false
   */
  
  /*
   * greaterThan(String, String) -> boolean
   * 
   * method is passed two Strings
   * method returns true if the first String is greater than the second String
   *  otherwise, the method returns false
   */
  
  /*
   * greaterThanOrEquals(String, String) -> boolean
   * 
   * method is passed two Strings
   * method returns true if the first String is greater than or equal to the second String
   *  otherwise, the method returns false
   */
  
  public static void main(String[] args) throws FileNotFoundException
  {
    OUT.print("Enter the input file name: "); // prompt the user for an input file name
    String fileName = KBD.nextLine();
    Scanner fileIn = new Scanner( new File( fileName ) );

    String str1 = fileIn.nextLine(); // read three strings from the file
    String str2 = fileIn.nextLine();
    String str3 = fileIn.nextLine();
    
    // compare the strings lexicographically
    
    String middle = str1;   // Assume str1 is the middle string
    
    // TO DO: Complete the following code:
    //  1. using (calling) the methods implemented above
    //  2. nested branches that DO NOT use the boolean oprerators !, && or ||
    
    // TO DO: Check to see if str1 is <= str2 and str3 >= str2
    //        If so, set the middle String to str2
    
    // TO DO: Check to see if str3 is <= str2 and str1 >= str2
    //        If so, set the middle String to str2
    
    // TO DO: Check to see if str1 is <= str3 and str2 >= str3
    //        If so, set the middle String to str3
    
    // TO DO: Check to see if str2 is <= str3 and str1 >= str3
    //        If so, set the middle String to str3
    
    System.out.println("The middle string is " + middle); // output the middle-valued string
  }
}

Answer 1

Program:-

/*

* CPS150_Lab10.java

*/

import java.io.File;

import java.io.FileNotFoundException;

import java.io.PrintStream;

import java.util.Scanner;

/**

* CPS 150, Fall 2018 semester

*

* Section N1

*

* Lab Project 13: Comparing Java Strings

*

* @author *** Replace with your name ***

*/

public class CPS150_Lab13 {

static final Scanner KBD = new Scanner(System.in);

static final PrintStream OUT = System.out;

// TO DO: Implement each of the following 4 methods,

// using the String compareTo method:

/*

* lessThan(String, String) -> boolean

*

* method is passed two Strings method returns true if the first String is less than the second String otherwise,

* the method returns false

*/

public boolean lessThan(final String str1, final String str2) {

final int var = str1.compareTo(str2);

if (var < 0) {

return true;

} else {

return false;

}

}

/*

* lessThanOrEquals(String, String) -> boolean

*

* method is passed two Strings method returns true if the first String is less than or equal to the second String

* otherwise, the method returns false

*/

public static boolean lessThanOrEquals(final String str1, final String str2) {

final int var = str1.compareTo(str2);

if (var <= 0) {

return true;

} else {

return false;

}

}

/*

* greaterThan(String, String) -> boolean

*

* method is passed two Strings method returns true if the first String is greater than the second String otherwise,

* the method returns false

*/

public boolean greaterThan(final String str1, final String str2) {

final int var = str1.compareTo(str2);

if (var > 0) {

return true;

} else {

return false;

}

}

/*

* greaterThanOrEquals(String, String) -> boolean

*

* method is passed two Strings method returns true if the first String is greater than or equal to the second

* String otherwise, the method returns false

*/

public static boolean greaterThanOrEquals(final String str1, final String str2) {

final int var = str1.compareTo(str2);

if (var >= 0) {

return true;

} else {

return false;

}

}

public static void main(final String[] args) throws FileNotFoundException {

OUT.print("Enter the input file name: "); // prompt the user for an input file name

final String fileName = KBD.nextLine();

final Scanner fileIn = new Scanner(new File(fileName));

final String str1 = fileIn.nextLine(); // read three strings from the file

final String str2 = fileIn.nextLine();

final String str3 = fileIn.nextLine();

// compare the strings lexicographically

String middle = str1; // Assume str1 is the middle string

// TO DO: Complete the following code:

// 1. using (calling) the methods implemented above

// 2. nested branches that DO NOT use the boolean oprerators !, && or ||

// TO DO: Check to see if str1 is <= str2 and str3 >= str2

// If so, set the middle String to str2

if (lessThanOrEquals(str1, str2)) {

if (greaterThanOrEquals(str3, str2)) {

middle = str2;

}

}

// TO DO: Check to see if str3 is <= str2 and str1 >= str2

// If so, set the middle String to str2

if (lessThanOrEquals(str3, str2)) {

if (greaterThanOrEquals(str1, str2)) {

middle = str2;

}

}

// TO DO: Check to see if str1 is <= str3 and str2 >= str3

// If so, set the middle String to str3

if (lessThanOrEquals(str1, str3)) {

if (greaterThanOrEquals(str2, str3)) {

middle = str3;

}

}

// TO DO: Check to see if str2 is <= str3 and str1 >= str3

// If so, set the middle String to str3

if (lessThanOrEquals(str2, str3)) {

if (greaterThanOrEquals(str1, str3)) {

middle = str3;

}

}

System.out.println("The middle string is " + middle); // output the middle-valued string

}

}

Text File:-

Deshmukh
Aditi
Anagha

OUTPUT:-