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Java remove()
In this section, you will get the detailed explanation about the remove() method of interface Iterator.

Java remove()

In this section, you will get the detailed explanation about the remove() method of interface Iterator. We are going to use remove() method of interface Iterator in Java. The description of the code is given below for the usage of the method.

Description of the code:

Here, you will get to know about the remove() method through the following java program. This method removes the last element returned by the iterator (optional operation) from the collection. As per every call to next, this method can only be called once. However, the iteration will continue other than by calling this method. This method will throw UnsupportedOperationException if the iterator doesn't support the remove operation and will throw IllegalStateException if after the last call to the next method, the remove method has already been called.

In the program code given below, we have taken a list of array that contains 0- 10 elements. Then with the help of hasNext() method we will get next elements as output. And to remove any element from the loop, we have applied remove() method which will remove that element which gives 0 remainder in this iteration. Hence we get the following output.

Here is the code of program:


import java.util.*;



public class remove{

    public static void main (String args[]){

      ArrayList arr = new ArrayList();

      System.out.println("Total elements of iterator: ");

      for (int i = 1; i < 10; i++) arr.add(i);

      int count = 0;

      for (Iterator i = arr.iterator(); i.hasNext();){

          System.out.println ("element is " + i.next());

          }

          System.out.println("After removing : ");

      for (Iterator i = arr.iterator(); i.hasNext();){

        count++;

        i.next();

        if (count%4 == 0) i.remove();

        }

        for (Iterator i = arr.iterator(); i.hasNext();){

          System.out.println ("element is " + i.next());

          }

          }

  }

Output of the program:

C:\>cd unique

C:\unique>javac remove.java

C:\unique>java remove
Total elements of iterator:
element is 1
element is 2
element is 3
element is 4
element is 5
element is 6
element is 7
element is 8
element is 9
After removing :
element is 1
element is 2
element is 3
element is 5
element is 6
element is 7
element is 9

C:\unique>

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Current Comments

2 comments so far (post your own) View All Comments Latest 10 Comments:

Yes there is a compiling problem caused by the add method and the int data type. I looked up the add method, apparently it takes a boolean argument. Would like to see this code if I could get it to work.

Posted by Carter on Tuesday, 10.14.08 @ 04:18am | #81062

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Dear sir in this program you are creating object of ArrayList class and through you are adding items or values using add method. While add() method do not get integer type arguments so this program generating error: at arr.add(i);
add(int ,object);
add(object);

Posted by ayaz on Wednesday, 06.11.08 @ 00:53am | #62979

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