This is a most frequently asked java interview question. The answer is No, interface cannot have constructors. In this post we will discuss why constructors… [Read More]
Java – Constructor Chaining with example
Calling a constructor from the another constructor of same class is known as Constructor chaining. The real purpose of Constructor Chaining is that you can… [Read More]
Java – private constructor example
The use of private constructor is to serve singleton classes. A singleton class is one which limits the number of objects creation to one. Using… [Read More]
Java ArrayList set() Method
Java ArrayList set() method is used to replace an existing element present in the ArrayList at the specified position with the new given element. The… [Read More]
Java ArrayList trimToSize() Method
The trimToSize() method of ArrayList class is used for memory optimization. It trims the capacity of ArrayList to the current list size. This method is… [Read More]
Java ArrayList remove(Object obj) Method example
In this guide, you will learn how to remove a specified element from an ArrayList using remove() method. The method remove(Object obj) removes the first… [Read More]
Java ArrayList remove(int index) Method example
Method remove(int index) is used for removing an element of the specified index from a list. It removes an element and returns the same. It… [Read More]
Java ArrayList lastIndexOf(Object 0bj) Method example
The method lastIndexOf(Object obj) returns the index of last occurrence of the specified element in the ArrayList. It returns -1 if the specified element does… [Read More]
Java ArrayList isEmpty() Method example
The isEmpty() method of java.util.ArrayList class is used to check whether the list is empty or not. This method returns a boolean value. It returns true if… [Read More]
Java ArrayList ensureCapacity() Method example
ArrayList internally implements growable dynamic array which means it can increase and decrease its size automatically. If we try to add an element to a… [Read More]
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