Write a program using the Outer class and Inner class

Hello guys, Welcome to lingarajtechhub.com . Today we are going to discuss outer class and inner class. Now, let’s see code

Code :

 package com.InnerClass.java;
  public class OuterClass {
	
	class InnerClass{
		int x = 89;
		
		void m1()
		{
			System.out.println("Inner Class Method.");
		}
	}

	public static void main(String[] args) {
		OuterClass ot = new OuterClass();
		InnerClass in = ot.new InnerClass();
		System.out.println(in.x);
		in.m1();
	}
}

Line-1:

package com.InnerClass.java

It is a java package , this package is created in a java project and it contains classes & interfaces inside the package.

Line-2:

public class OuterClass

OuterClass is the class name. class is a template used to create objects & class-name first letters must be capital. It is public means we can use this outside of the package.

Line-4:

class InnerClass

InnerClass is the class name. class is a template used to create objects. Inside the outer class we create the inner class.

Line-5:

int x = 89

Here x is a variable. int(integer) is a data type of the variable. Here assign x value.

Line-7:

void m1()

{

System.out.println(“Inner Class Method.”);

}

In this line create a method whose name takes m1().system is a predefined class .Out is a static variable of type printstream present in system class. Println shows the result.

Line-13:

public static void main(String[] args)

It is a main method in which we can execute a program.

public : It is an access modifier. The main() is public because we can access main() outside of the class , if main() can’t be public then JVM(Java Virtual Machine) can’t be called main() & code can’t be executed.
Static : static is a keyword in which the main method has to be static in which JVM can load the class into memory and call the main method without creating an instance.
Void : Void is a data type. It means no return type.
main(): Main is a function.
String [] args : string means collection of characters ,String[] args represents a collection of Strings that are separated by a space and can be typed into the program on the terminal directly.

Line-14: