Multiline comments (/* */) are used to comment multiple lines in the source code. Example Live Demo public class CommentsExample { /* Following is the main method here, We create a variable named num. And, print its value * */ public static void main(String args[]) { //Declaring a variable named num int num = 1; ... Read More

To comment a particular line just place ‘double back slash (//)’ before the line as shown below. // Hello this line is commented Example Following example demonstrates the usage of single line comments in Java. Live Demo public class CommentsExample { public static void main(String args[]) { //Declaring a variable named num int num = 1; //Printing the value of the variable num System.out.println("value if the variable num: "+num); } } Output value if the variable num: 1

The java.lang package is the default package in Java, by default, it will be imported. Therefore, there is no need to import this package explicitly. i.e. without importing you can access the classes of this package. Example If you observe the following example here we haven’t imported the lang package explicitly but, still, we are able to calculate the square root of a number using the sqrt() method of the java.lang.Math class. Live Demo public class LangTest { public static void main(String args[]) { int num = 100; ... Read More

Before running Java programs on your machine you need to set two environment variables namely, PATH − The path environment variable is used to specify the set of directories which contains execution programs.When you try to execute a program from command line, the operating system searches for the specified program in the current directly, if available, executes it.In case the programs are not available in the current directory, operating system verifies in the set of directories specified in the ‘PATH’ environment variable.CLASSPATH − The classpath environment variable is used to specify the location of the classes and packages.When we try ... Read More

Java provides two types of branching/control statements namely, break and continue.The break statementThis statement terminates the loop or switch statement and transfers execution to the statement immediately following the loop or switch.ExampleFollowing is the example of the break statement. Here we are trying to print elements up to 10 and, using break statement we are terminating the loop when the value in the loop reaches 8.Live Demopublic class BreakExample {    public static void main(String args[]){       for(int i=0; i

The static keyword is used to create methods that will exist independently of any instances created for the class. Static methods do not use any instance variables of any object of the class they are defined in. Static methods take all the data from parameters and compute something from those parameters, with no reference to variables. We can inherit static methods in Java. Example In the example we are creating a class named Demo and, declared a static method named display(). We created another class Sample, extended the Demo class and tried to access the display() method using the sub ... Read More

To generate Java docs for your project you need to write the required information about the field, method or class as./**    *    * The method prints a simple message on the Console.    * */Then to generate the document follow the steps given below −Step 1 − Open eclipse, select the option Project →Generate Javadoc.Step 2 − Select the javadoc.exe file from the bin folder of java installation directory, select the destination folder for the generated java doc and select Next.Step 3 − Type the title of the documentation in the Document title and select thefinish button.Step 4 ... Read More

A static inner class is a nested class which is a static member of the outer class. It can be accessed without instantiating the outer class, using other static members. Just like static members, a static nested class does not have access to the instance variables and methods of the outer class. You can extend static inner class with another inner class. Example Live Demo public class SampleClass { static abstract class Test{ int num = 300; public abstract void display(); ... Read More

Javadocs is the documentation file for a particular library/project these documents provide information about the classes and methods of that library/project. Javadoc is a tool to generate documentation for a project. It will be found in the bin folder of the Java installation folder. Using this tool you can generate documentation for your Java code.

Anonymous Classes in Java are classes that do not have a name. They are typically used to extend a class or implement an interface without the need for a separate named class. The following are the common uses of anonymous classes:Implementing event listeners.Creating Runnable objects for threads.Providing custom implementations for abstract methods of an abstract class. Constructors in an Anonymous class Anonymous classes cannot have a constructor, but the compiler provides a default constructor for them. This means that when you create an instance of an anonymous class, it will call the constructor of the superclass or the interface it ... Read More