Write a program to display details of customers through default constructor

Hello guys, welcome to lingarajtechhub.com . Today we are going to discuss the display details of customers through default constructor.

Code:

package com.Customer_default.java;

public class Customer {
	String name,address;
	int DOB,salary;
	
	Customer(){
		name="Gyana ranjan Sahoo.";
		address="BBSR";
		DOB=22/05/1994;
		salary=25000;
	}
	
	void show() {
		System.out.println("Customer details are:");
		System.out.println("Name:"+name);
		System.out.println("Address:"+address);
		System.out.println("DOB:"+DOB);
		System.out.println("Salary:"+salary);
	}

	public static void main(String[] args) {
		Customer A=new Customer();
		A.show();
	}

}

Line-1:

package com.Customer_default.java;

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

Line-3:

public class Customer

“Customer” 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:

String name,address;

Here name,address are the variables and String is a class. It is not a data type.

Line-5:

int DOB,salary

DOB,salary are the variables and int is a data type of the variable.

Line-7:

Customer(){

name=”Gyana ranjan Sahoo.”;

address=”BBSR”;

DOB=22/05/1994;

salary=25000;

}

“Customer” is a constructor which is user defined.Constructor name is always same as class- name .Inside the constructor we assign value .

Line-14:

void show() {

System.out.println(“Customer details are:”);

System.out.println(“Name:”+name);

System.out.println(“Address:”+address);

System.out.println(“DOB:”+DOB);

System.out.println(“Salary:”+salary);

}

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

Line-22:

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-23: