Question

Activity 2. Complete the code inside the Java file below, ListUtil.java, such that this class supplies a utility method to reverse the entries in a linked list. Then, test your code using the tester class, Reverse Tester.java, given below. ListUtil.java import java.util.LinkedList; /** This class supplies a utility method to reverse the entries in a linked list. */ public class ListUtil { /** Reverses the elements in a linked list @param strings the linked list to reverse public static void reverse(LinkedList<String> strings) { // Complete this static method based on its JavaDoc comment. } */ } ReverseTester.java import java.util.LinkedList; /** A test program to reverse the entries in a linked list. */ public class ReverseTester public public static void main(String[] args) { LinkedList<String> employeeNames = new LinkedList>(); employeeNames. addLast("Dick"); employeeNames. addLast("Harry"); employeeNames. addLast("Romeo"); employeeNames. addLast("Tom"); ListUtil.reverse( employeeNames); System.out.println(employeeNames); System.out.println("Expected: [Tom, Romeo, Harry, Dick]"); } }

Answer 1

Answer:

CODE: Java Programming Language

// ListUtil.java

import java.util.LinkedList;
/**
This class supplies a utility method to reverse the entries in a linked list.
*/
public class ListUtil {
   /**
   Reverse the elements in a linked list
   @param strings the linked list to reverse
   */
   public static void reverse(LinkedList<String> strings) {
       // Complete this static method based on its JavaDoc element.
       String temp;
       for(int i = 0; i < strings.size() / 2; i++) {
           temp = strings.get(i);
           strings.set(i, strings.get(strings.size() - i - 1));
           strings.set(strings.size() - i - 1, temp);
       }
   }
}

// ReverseTester.java

import java.util.LinkedList;
/**
    A test program to reverse the elements in a linked list.
*/
public class ReverseTester {
   public static void main(String[] args) {
       LinkedList<String> employeeNames = new LinkedList<>();
       employeeNames.addLast("Dick");
       employeeNames.addLast("Harry");
       employeeNames.addLast("Romeo");
       employeeNames.addLast("Tom");
      
       ListUtil.reverse(employeeNames);
       System.out.println(employeeNames);
       System.out.println("Expected: [Tom, Romeo, Harry, Dick]");
   }
}

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SCREENSHOT OF THE CODE:

// ListUtil.java

- 3 4 LollyShopDri.. Person.java D GUI.java ListUtil.java X ReverseTest... 1 import java.util.LinkedList; 2e /** This class supplies a utility method to reverse the entries in a linked list. */ 5 public class ListUtil { 60 /** Reverse the elements in a linked list @param strings the linked list to reverse */ 100 public static void reverse(LinkedList<String> strings) { // Complete this static method based on its JavaDoc element. String temp; for(int i = 0; i < strings.size() / 2; i++) { temp = strings.get(i); strings.set(i, strings.get(strings.size() i - 1)); 16 strings.set(strings.size() i - 1, temp); 7 8 9 11 12 13 14 15 17 18 } 19}

// ReverseTester.java

94 4 LollyShopDri... Person.java GUI.java ListUtil.java Reverse Test... X 1 import java.util.LinkedList; 20/** 3 A test program to reverse the elements in a linked list. */ 5 public class ReverseTester { public static void main(String[] args) { LinkedList<String> employeeNames = new LinkedList<>(); employeeNames.addLast("Dick"); employeeNames.addlast("Harry"); employeeNames.addLast("Romeo"); employeeNames.addlast("Tom"); 66 7 8 9 10 11 12 13 14 15 16 17 } ListUtil.reverse (employeeNames); System.out.println(employeeNames); System.out.println("Expected: [Tom, Romeo, Harry, Dick]"); }

======================================================================

OUTPUT:

<terminated> ReverseTester [Java Application] C:\Program Files\Java\jdk-12.0.2\bi [Tom, Romeo, Harry, Dick] Expected: [Tom, Romeo, Harry, Dick]

Thank you.