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.javaFor execute, the program runs this command
java SimpleOUTPUT
Hello Java Programmer
The flow of the program compilation
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
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