Arraylist Union and Intersection using iterator my union and intersection is wei

Question

Arraylist Union and Intersection using iterator

my union and intersection is weird... it is sorted arraylist but what i expected was for union:{1 2 3 4 5 6} and inetersection:{4 5} but it seems union just prints out everything iguess and the intersection printsout nothing

below is teh code

public static void getUnion(){
   System.out.print("A Union B is:{");
   Iterator<Integer> itr = m1.iterator();
   while(itr.hasNext())
   {
   System.out.print(itr.next());
   if(itr.hasNext())
   {
   System.out.print(" ");
   }
   }
   itr = m2.iterator();
   while(itr.hasNext())
   {
   Integer temp = itr.next();
   if(!m1.contains(temp))
   {
   System.out.print(temp);
   }
     
   if(itr.hasNext())
   {
   System.out.print(" ");
   }
   }
     
     
   System.out.println("}");
   }

      
       public static void getIntersection(){
           ArrayList<Integer> in= new ArrayList<Integer>();
           Iterator<Integer> itr =m1.iterator();
           Iterator<Integer> itr2 = m2.iterator();
           System.out.print("A Intersect B is: {");
       itr = m2.iterator();
       while(itr.hasNext())
       {
       Integer temp = itr.next();
       if(m1.contains(temp))
       {
       System.out.print(temp);
       if(itr.hasNext())
       {
       System.out.print(", ");
       }
       }
       }
       System.out.println("}");
       }

Console union ava cation] C:Pro am Files Java 1.8.0 Abiniavaw.exe (Mar 21, 2017, 10:28:07 PM 1. Add element in A 2.Add element in B 3.Get union 4.Get Intersection S.Display current A and B 6. exit A Elements are: 1 2 3 4 5 B Elements are: 4 5 6 Please select the menu 1.Add element in A 2.Add element in B 3. Get union 4.Get Intersection 5.Display current A and B 6 exit A Union B is {1 2 3 4 54 5 61 Please select the menu: 1.Add element in A 2.Add element in B 3 Get union 4 Get Intersection s Display current A and B 6. exit A Intersect B is Please select the menu 1.Add element in A 2.Add element in B Get union 4. Get Intersection 5. Display current A and B 6 exit

Explanation / Answer

import java.util.*;

class SetOperations
{
   public static void main (String[] args)
   {
        Scanner scan = new Scanner(System.in);
        int element;
      
        ArrayList<Integer>m1 = new ArrayList<Integer>();
        ArrayList<Integer>m2 = new ArrayList<Integer>();
      
        System.out.println(" Enter the number of elements in m1 : ");
        int size1 = scan.nextInt();
      
        System.out.println(" Enter the elements of m1 : ");
        for(int i=0;i<size1;i++)
        {
            element = scan.nextInt();
            m1.add(element);
          
        }
      
        System.out.println(" Enter the number of elements in m2 : ");
        int size2 = scan.nextInt();
      
        System.out.println(" Enter the elements of m2 : ");
        for(int i=0;i<size2;i++)
        {
            element = scan.nextInt();
            m2.add(element);
          
        }
      
        System.out.println(" Union : ");
        getUnion(m1,m2);
      
        System.out.println(" Intersection : ");
        getIntersection(m1,m2);
      
      
   }
   public static void getUnion(ArrayList<Integer>m1,ArrayList<Integer>m2)
   {
           System.out.print("A Union B is:{");
           Iterator<Integer> itr = m1.iterator();
           while(itr.hasNext())
           {
               System.out.print(itr.next());
               if(itr.hasNext())
               {
                   System.out.print(" ");
               }
           }
           System.out.print(" ");
           for (Integer t : m2) {
            if(!m1.contains(t)) {     //print the elements which do not match in m2
              System.out.print(t+ " ");
            }
        }
         
         
           System.out.println("}");
      }

      
         public static void getIntersection(ArrayList<Integer>m1,ArrayList<Integer>m2)
         {
             ArrayList<Integer> in= new ArrayList<Integer>();
             Iterator<Integer> itr =m1.iterator();
             Iterator<Integer> itr2 = m2.iterator();
             System.out.print("A Intersect B is: {");
               itr = m2.iterator();
               while(itr.hasNext())
               {
                  Integer temp = itr.next();
                   if(m1.contains(temp))
                   {
                       System.out.print(temp);
                       if(itr.hasNext())
                       {
                           System.out.print(" ");
                       }
                   }
               }
               System.out.println("}");
         }
}

Output:

Enter the number of elements in m1 : 3
Enter the elements of m1 :

45

67

34

Enter the number of elements in m2 : 4
Enter the elements of m2 :

45

78

66

23

Union :

A Union B is : {45 67 34 78 66 23 }

Intersection :

A Intersection B is : {45 }

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