How to remove the elements of an array which are equal in value?

Question

Using ArrayUtills in java code it is possible to remove an element from an java array. Below is the code which removes an element at a particlular index (in the code it is '2', which removes element value equalto '10'.

import java.util.Arrays;

import org.apache.commons.lang3.ArrayUtils;


public class RemoveObjectFromArray{

 public static void main(String args[]) {


     int[] test = new int[] { 10, 13, 10, 10, 105};

     System.out.println("Original Array : size : " + test.length );
     System.out.println("Contents : " + Arrays.toString(test));

     //let's remove or delete an element from Array using Apache Commons ArrayUtils
     test = ArrayUtils.remove(test, 2); //removing element at index 2

     //Size of array must be 1 less than original array after deleting an element
     System.out.println("Size of array after removing an element  : " + test.length);
     System.out.println("Content of Array after removing an object : "
                       + Arrays.toString(test));

 } }

It gives the output as:

run:
Original Array : size : 5
Contents : [10, 13, 10, 10, 105]
Size of array after removing an element  : 4
Content of Array after removing an object : [10, 13, 10, 105]

How the code can be amended to get the following output:

run:
Original Array : size : 5
Contents : [10, 13, 10, 10, 105]
Size of array after removing an element  : 2
Content of Array after removing an object : [ 13, 105]

Answer 1

Try this code

while (ArrayUtils.contains(test, 10))  {
  //let's remove or delete an element from Array using Apache Commons ArrayUtils
  test = ArrayUtils.removeElement(test, 10); //removing element with value 10
}

It should solve your problem.

Answer 2

I would use an ArrayList in your case but if you want to stick with your array you can do the following:

int count = 0;
for(int i = 0; i < test.length; i++){
  if (test[i] == 10) {
    count++;
  }
 }
 int[] newTest = new int[count];
 count = 0;
 for( int = 0; i < test.length; i++){
   if(test[i] != 10){
     newTest[count++] = test[i];
   }
  }

i didn't test it