Compilation of the first Java program

Import java.io.*;

public class employeetest{

public static void Main (String args[]) {
/* Create two objects using a constructor */
Employee Empone = new Employee ("RUNOOB1");
Employee Emptwo = new Employee ("RUNOOB2");

Call the member methods of both objects
Empone.empage (26);
Empone.empdesignation ("Senior Programmer");
Empone.empsalary (1000);
Empone.printemployee ();

Emptwo.empage (21);
Emptwo.empdesignation ("rookie programmer");
Emptwo.empsalary (500);
Emptwo.printemployee ();
}
}
Class employee{
String name;
int age;
String designation;
Double salary;
Constructor for Employee class
Public Employee (String name) {
THIS.name = name;
}
Set the value of age
public void empage (int empage) {
age = Empage;
}
/* Set the value of designation */
public void Empdesignation (String empdesig) {
designation = Empdesig;
}
/* Set the value of salary */
public void Empsalary (double empsalary) {
salary = Empsalary;
}
/* Print information */
public void Printemployee () {
System.out.println ("Name:" + name);
System.out.println ("Age:" + ages);
System.out.println ("Position:" + designation);
System.out.println ("Salary:" + salary);
}
}

Results:

Name: RUNOOB1
Age: 26
Position: Senior Programmer
Salary: 1000.0
Name: RUNOOB2
Age: 21
Position: Rookie Programmer
Salary: 500.0

The main function is placed first, and a file contains at most one public, which is the class where the main function resides. This is a compilation method in a file, if the two classes are compiled separately to compile is the following look and method.

2.

A simple example

In this example, we create two classes:Employee and employeetest.

First, open the text editor and paste the following code in. Note Save the file as Employee.java.

The employee class has four member variables: name, age, designation, and salary. The class explicitly declares a constructor method that has only one parameter.

Employee.java File Code:Import Java.Io.*;Public Class Employee{ String Name;Int Age;String Designation;Double Salary;//Constructor for Employee class Public Employee(String Name){ This.Name=Name;} //Set the value of age Public void Empage(Int Empage){ Age=Empage;} /*Set the value of the designation*/ Public void Empdesignation(String Empdesig){ Designation=Empdesig;} /*Set the value of the salary*/ Public void Empsalary(Double Empsalary){ Salary=Empsalary;} /*Printing information*/ Public void Printemployee(){ System.Out.println("Name:"+Name );System.Out.println("Age:"+Age );Systemout. Println ( " jobs: " + designation ) system. Out. Println ( " Salary: " + salary) } } /span>

The program starts with the main method. In order to run this program, you must include the main method and create an instance object.

The following is a employeetest class that instantiates an instance of 2 Employee classes and invokes a method to set the value of a variable.

Save the following code in the Employeetest.java file.

Employeetest.java File Code:Import Java.Io.*;Public Class Employeetest{ Public Static void Main(String Args[]){ /*Create two objects using the constructor*/ Employee Empone=New Employee("RUNOOB1");Employee Emptwo=New Employee("RUNOOB2");//Call the member methods of both objects Empone.Empage(26);Empone.Empdesignation("Senior Programmer");Empone.Empsalary(1000);Empone.Printemployee();Emptwo.Empage(21) emptwo. Empdesignation ( " rookie programmer ") emptwo. Empsalary (500) emptwo. Printemployee} } /span>

Compiling these two files and running the Employeetest class, you can see the following results:

Employeetest.  employeetest  name:RUNOOB1 Age:  jobs: Senior programmer  Salary:1000.0  Name: RUNOOB2 Age:+  job: Rookie programmer  Salary:500.0

Compilation of the first Java program