Java Example Program to Remove element from specified index ArrayList

 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