Question 1: Write a program that reads words into two ArrayLists list1 and list2

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Question 1: Write a program that reads words into two ArrayLists list1 and list2 and then creates a third ArrayList that contains words which are common to both list1 and list2. You may assume that the strings are entered as words separated by a space on a single line and the end is signaled by “-1” (String -1). You can use keyboard.next() to read each word.

Question 2: Write a program that reads words into an ArrayList list1 and creates another ArrayList list2 that has the same words in list1 but no duplicates.

Exercise 1: Write a program that reads words into two ArrayLists list 1 and list2 and then creates a third Array List that contains words which are common to both list1 and list2. You may assume that the strings are entered as words separated by a space on a single line and the end is signaled by "-1" (String -1). You can use keyboard.next0 to read each word. A sample dialog is shown below Enter words on one line, end with -1 java c pascal ada java c++ -1 Enter words on one line, end with -1 c pascal java lisp isp -1 java c, pascal ada java, C++] CC, pascal java, lisp, lisp Array List with common strings: [c, pascal java Exercise 2: Write a program that reads words into an ArrayList list1 and creates another ArrayList list2 that has the same words in list1 but no duplicates. A sample dialog is shown below: Enter words on one line, end with -1 java c pascal ada java java ada C++ -1 Array List with no duplicates java C, pascal ada c++]

Explanation / Answer

Question 1:

ArrayListTester.java

import java.util.ArrayList;
import java.util.Scanner;

public class ArrayListTester {

   public static void main(String[] args) {
       ArrayList<String> list1 = new ArrayList<String>();
       ArrayList<String> list2 = new ArrayList<String>();
       ArrayList<String> list3 = new ArrayList<String>();
       Scanner scan = new Scanner(System.in);
       System.out.println("Enter words on one line, end with -1: ");
       String s = scan.nextLine();
       Scanner scan1 = new Scanner(s);
       while(scan1.hasNext()){
           String word = scan1.next();
           if(!word.equals("-1")){
               list1.add(word);
           }
       }
       System.out.println("Enter words on one line, end with -1: ");
       s = scan.nextLine();
       scan1 = new Scanner(s);
       while(scan1.hasNext()){
           String word = scan1.next();
           if(!word.equals("-1")){
               list2.add(word);
           }
       }
       for(int i=0; i<list1.size(); i++){
           for(int j=0; j<list2.size(); j++){
               if(list1.get(i).equalsIgnoreCase(list2.get(j))){
                   if(!list3.contains(list1.get(i))){
                       list3.add(list1.get(i));
                   }
               }
           }
       }
       System.out.println(list1);
       System.out.println(list2);
       System.out.println("ArrayList with common strings: ");
       System.out.println(list3);
   }

}

Output:

Enter words on one line, end with -1:
java c pascel ada java c++ -1
Enter words on one line, end with -1:
c pascel java lisp lisp -1
[java, c, pascel, ada, java, c++]
[c, pascel, java, lisp, lisp]
ArrayList with common strings:
[java, c, pascel]

Question 2:

ArrayListTester2.java

import java.util.ArrayList;
import java.util.Scanner;

public class ArrayListTester2 {

   public static void main(String[] args) {
       ArrayList<String> list1 = new ArrayList<String>();
       ArrayList<String> list2 = new ArrayList<String>();
       Scanner scan = new Scanner(System.in);
       System.out.println("Enter words on one line, end with -1: ");
       String s = scan.nextLine();
       Scanner scan1 = new Scanner(s);
       while(scan1.hasNext()){
           String word = scan1.next();
           if(!word.equals("-1")){
               list1.add(word);
           }
       }
       for(int i=0; i<list1.size(); i++){
                   if(!list2.contains(list1.get(i))){
                       list2.add(list1.get(i));
                   }
               }
          
       System.out.println(list1);
       System.out.println("ArrayList with no duplicates: ");
       System.out.println(list2);
   }

}

Output:

Enter words on one line, end with -1:
java c pascel ada java java ada c++ -1
[java, c, pascel, ada, java, java, ada, c++]
ArrayList with no duplicates:
[java, c, pascel, ada, c++]

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