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 1.Basic java Example program to remove an element from specified index ArrayList.

  1. package com.instanceofjavaforus;
  2. import java.util.ArrayList;
  3.  
  4. public class RemoveElementArrayList{
  5.  
  6. public static void main(String[] args) {
  7.  
  8.    //create an ArrayList object
  9.         ArrayList<String> arrayList = new ArrayList<String>();
  10.        
  11.         //Add elements to Arraylist
  12.         arrayList.add("A");
  13.         arrayList.add("B");
  14.         arrayList.add("C"); 
  15.         arrayList.add("A");
  16.        
  17.   /*
  18.    To remove an element from the specified index of ArrayList use
  19.     Object remove(int index) method.
  20.     It returns the element that was removed from the ArrayList. */
  21.  
  22.     Object obj = arrayList.remove(1);
  23.      System.out.println(obj + " is removed from ArrayList");
  24.        
  25.   System.out.println("ArrayList contains...");
  26.   //display ArrayList elements using for loop
  27.     for(int index=0; index < arrayList.size(); index++)
  28.     System.out.println(arrayList.get(index));
  29.   
  30.  
  31.  }
  32. }
     


Output:

  1. B is removed from ArrayList
  2. ArrayList contains...
  3. A
  4. C
  5. A

     
 2.Basic java Example program to remove all elements from ArrayList.

  1. package com.instanceofjavaforus;
  2. import java.util.ArrayList;
  3.  
  4. public class RemoveAllElementArrayList{
  5.  
  6. public static void main(String[] args) {
  7.  
  8.    //create an ArrayList object
  9.         ArrayList<String> arrayList = new ArrayList<String>();
  10.        
  11.         //Add elements to Arraylist
  12.         arrayList.add("A");
  13.         arrayList.add("B");
  14.         arrayList.add("C"); 
  15.         arrayList.add("A");
  16.        
  17.  
  18. System.out.println("Size of ArrayList before removing elements : "+ arrayList.size());
  19.  
  20. /*
  21. To remove all elements from the ArrayList we need to use
  22. void clear() method.
  23. */
  24. arrayList.clear();
  25. System.out.println("Size of ArrayList after removing elements : "+ arrayList.size());  
  26.  
  27.  }
  28. }
     
Output:

     
  1. B is removed from ArrayList
  2. ArrayList contains...
  3. A
  4. C
  5. A

Instance Of Java

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