simple java program

simple java program

In this post, we write simple java programs. We learn How to write the simple java program after installing the JDK in your system. For executing any java program you have to install JDK. If you have not installed then read this guide. and set path of the jdk/bin directory and then create a java program, run and execute.

simple java program

class example{  
    public static void main(String args[]){  
     System.out.println("Hello Java Programmer");  
    }  
}  

saves this file as example.java

For compile, the program run this command

javac example.java

For execute, the program runs this command

java Simple

OUTPUT

Hello Java Programmer

The flow of the program compilation

simple java program

Some other java programs are as follows.

Calculate develop code in a simple java program

* Java Program Example - Make Calculator */
		
import java.util.Scanner;

public class JavaProgram
{
    public static void main(String args[])
    {
        float a, b, res;
        char choice, ch;
        Scanner scan = new Scanner(System.in);
		
        do
        {
            System.out.print("1. Addition\n");
            System.out.print("2. Subtraction\n");
            System.out.print("3. Multiplication\n");
            System.out.print("4. Division\n");
            System.out.print("5. Exit\n\n");
            System.out.print("Enter Your Choice : ");
            choice = scan.next().charAt(0);
            switch(choice)
            {
                case '1' : System.out.print("Enter Two Number : ");
                    a = scan.nextFloat();
                    b = scan.nextFloat();
                    res = a + b;
                    System.out.print("Result = " + res);
                    break;
                case '2' : System.out.print("Enter Two Number : ");
                    a = scan.nextFloat();
                    b = scan.nextFloat();
                    res = a - b;
                    System.out.print("Result = " + res);
                    break;
                case '3' : System.out.print("Enter Two Number : ");
                    a = scan.nextFloat();
                    b = scan.nextFloat();
                    res = a * b;
                    System.out.print("Result = " + res);
                    break;
                case '4' : System.out.print("Enter Two Number : ");
                    a = scan.nextFloat();
                    b = scan.nextFloat();
                    res = a / b;
                    System.out.print("Result = " + res);
                    break;
                case '5' : System.exit(0);
                    break;
                default : System.out.print("Wrong Choice!!!");
                    break;
            }
            System.out.print("\n---------------------------------------\n");
        }while(choice != 5);       
    }
}

Add Two Integers in Java Program(simple java program)

ublic class AddTwoIntegers {

    public static void main(String[] args) {
        
        int first = 10;
        int second = 20;

        int sum = first + second;

        System.out.println("The sum is: " + sum);
    }
}

Multiply Two Floating-Point Numbers(simple java program)

public class MultiplyTwoNumbers {

    public static void main(String[] args) {

        float first = 1.5f;
        float second = 2.0f;

        float product = first * second;

        System.out.println("The product is: " + product);
    }
}

Find the ASCII value of a character(simple java program)

public class AsciiValue {

    public static void main(String[] args) {

        char ch = 'a';
        int ascii = ch;
        // You can also cast char to int
        int castAscii = (int) ch;

        System.out.println("The ASCII value of " + ch + " is: " + ascii);
        System.out.println("The ASCII value of " + ch + " is: " + castAscii);
    }
}

Compute Quotient and Remainder

public class QuotientRemainder {

    public static void main(String[] args) {

        int dividend = 25, divisor = 4;

        int quotient = dividend / divisor;
        int remainder = dividend % divisor;

        System.out.println("Quotient = " + quotient);
        System.out.println("Remainder = " + remainder);
    }
}

Swap two numbers using the temporary variable

public class SwapNumbers {

    public static void main(String[] args) {

        float first = 1.20f, second = 2.45f;

        System.out.println("--Before swap--");
        System.out.println("First number = " + first);
        System.out.println("Second number = " + second);

        // Value of first is assigned to temporary
        float temporary = first;

        // Value of second is assigned to first
        first = second;

        // Value of temporary (which contains the initial value of first) is assigned to second
        second = temporary;

        System.out.println("--After swap--");
        System.out.println("First number = " + first);
        System.out.println("Second number = " + second);
    }
}

Check whether a number is even or odd using if…else statement

import java.util.Scanner;

public class EvenOdd {

    public static void main(String[] args) {

        Scanner reader = new Scanner(System.in);

        System.out.print("Enter a number: ");
        int num = reader.nextInt();

        if(num % 2 == 0)
            System.out.println(num + " is even");
        else
            System.out.println(num + " is odd");
    }
}

Find Largest Among three numbers using if..else statement

public class Largest {

    public static void main(String[] args) {

        double n1 = -4.5, n2 = 3.9, n3 = 2.5;

        if( n1 >= n2 && n1 >= n3)
            System.out.println(n1 + " is the largest number.");

        else if (n2 >= n1 && n2 >= n3)
            System.out.println(n2 + " is the largest number.");

        else
            System.out.println(n3 + " is the largest number.");
    }
}

simple Java Program to Check a Leap Year

public class LeapYear {

    public static void main(String[] args) {

        int year = 1900;
        boolean leap = false;

        if(year % 4 == 0)
        {
            if( year % 100 == 0)
            {
                // year is divisible by 400, hence the year is a leap year
                if ( year % 400 == 0)
                    leap = true;
                else
                    leap = false;
            }
            else
                leap = true;
        }
        else
            leap = false;

        if(leap)
            System.out.println(year + " is a leap year.");
        else
            System.out.println(year + " is not a leap year.");
    }
}

Visit the java website for more information. Visit

visit the java tutorial list. And make strong your java concept. Click here. wuschools.com is always written about the CSS concept for the java lover. And writes about how java makes your life easy if you are a web site developer. We help you to continue your learning.

Leave a Reply

Close Menu