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Category: Java

Java ArrayList

In this post we will learn about Java Array List. Java ArrayList class uses a dynamic array for storing the elements i.e. we don’t need to specify size as in case of traditional Array we used to do. It extends AbstractList class and implements List interface. ArrayList class can contain duplicate elements. ArrayList class can […]

Finalize method in java

In this post we will learn about finalize() method. Few facts about finalize() method that we should be aware of are listed below: It is a method of object() class and we can override and overload this method. This method is called by garbage collector whenever object is removing from the memory by the garbage […]

Java Assertion

Assertion in Java was introduced in JDK 1.4. Assert is a keyword. There are two types of assert statements : very simple assert statement. assert <boolean_result>; (After assert there should be a space ) simple assert statement. assert< boolean_result> :some literal By default assert statements will not execute because they are disabled. In order to […]

Scanner Class in Java

Scanner is a concrete class in Java. Hence, we can create object of Scanner class using new operator. Scanner sc= new Scanner (System.in); It is developed inside java.util package and was introduced in JDK 1.5 . It is having one constructor which required input stream through System.in .   Let us take a simple example […]

Wrapper Classes in Java

For every primitive data, there are corresponding wrapper classes.┬áThere are total eight primitive data type and eight corresponding wrapper classes which are listed below: byte : Byte short: Short int : Integer long : Long float: Float double : Double char : Character boolean: Boolean All these Wrapper classes are available in java.lang package developed […]

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