1) Prints the Welcome
public class simple
{
public static void main(String args[])
{
System.out.println(“Welcome!”);
}
}
Output:
Welcome
2) Calling the greet method from another class
public class Greeting
{
/* Defining Methods*/
public void greet()
{
System.out.println(“Hi! Welcome”);
}
}
public class TestGreeting
{
public static void main(String args[])
{
/* Creating objects */
Greeting hello = new Greeting();
/* Calling the method using objects from another class*/
hello.greet();
}
}
Output:
Hi! Welcome
3)Compute the biggest number among three numbers
class biggestnumber
{
public static void main(String args[])
{
int a = Integer.parseInt(args[0]);
int b = Integer.parseInt(args[1]);
int c = Integer.parseInt(args[2]);
if((a>b)&&(a>c))
System.out.println(“The biggest among the three numbers is:” +a);
else if((b>a)&&(b>c))
System.out.println(“The biggest among the three numbers is:” +b);
else
System.out.println(“The biggest among the three numbers is:” +c);
}
}
Output:
java biggestnumber 23 30 20
The biggest among the three numbers is:30
4) Prints the values stored in the primitive types and string
public class sample
{
public static void main(String args[])
{
int a=10;
float b=10000.0F;
String name= “Vignesh karthick”;
System.out.println(“Integer a:” +a);
System.out.println(“Float b:” +b);
System.out.println(“String name:” + name);
}
}
Output:
Integer a:10
Float b:10000.0
String name:Vignesh karthick
5) Computation distance light travels using long variables.
class Light
{
public static void main(String args[])
{
int lightspeed;
long days;
long seconds;
long distance;
// approximate speed of light in miles per second
lightspeed = 186000;
days = 1000; // specify number of days here
seconds = days * 24 * 60 * 60; // convert to seconds
distance = lightspeed * seconds; // compute distance
System.out.print(“In ” + days);
System.out.print(” days light will travel about “);
System.out.println(distance + ” miles.”);
}
}
Output:
In 1000 days light will travel about 16070400000000 miles.
6) Factorial of a given number
import java.io.*;
class factorial
{
public static void main(String args[])throws IOException
{
int i,n,f=1;
DataInputStream in=new DataInputStream(System.in);
System.out.println(“Enter the number:”);
n=Integer.parseInt(in.readLine());
System.out.println(“The factorial of” +n+ “is” );
for(i=1;i<=n;i++)
{
f=f*i;
}
System.out.println(f);
}
}
Output:
Enter the number:
5
The factorial of 5 is
120
7) Swapping of 2 numbers with third variable
class SwappingWithThirdVariable
{
public static void main(String args[])
{
int num1=50;
int num2=20;
System.out.println(“Before Swapping”);
System.out.println(“num1:” + num1);
System.out.println(“num2:” + num2);
swap(num1,num2);
}
public static void swap(int num1,int num2)
{
int temp;
temp=num1;
num1=num2;
num2=temp;
System.out.println(“After Swapping”);
System.out.println(“num1:” + num1);
System.out.println(“num2:” + num2);
}
}
Output:
Before Swapping
num1:50
num2:20
After Swapping
num1:20
num2:50
8) Swapping of 2 numbers without third variable
class SwappingWithOutThirdVariable
{
public static void main(String args[])
{
int num1=10;
int num2=20;
System.out.println(“Before Swapping”);
System.out.println(“num1:” + num1);
System.out.println(“num2:” + num2);
swap(num1,num2);
}
public static void swap(int num1,int num2)
{
num1=num1+num2;
num2=num1-num2;
num1=num1-num2;
System.out.println(“After Swapping”);
System.out.println(“num1:” + num1);
System.out.println(“num2:” + num2);
}
}
Output:
Before Swapping
num1:10
num2:20
After Swapping
num1:20
num2:10
9) Fibonnaci Series for a given number of times
import java.io.*;
class fibonacci
{
public static void main(String args[])throws IOException
{
int f1=-1,f2=1,f3,i,n;
DataInputStream in = new DataInputStream(System.in);
System.out.println(“Enter the limit:”);
n=Integer.parseInt(in.readLine());
System.out.println(“Fibonacci Series are:”);
for(i=1;i<=n;i++)
{
f3=f1+f2;
f1=f2;
f2=f3;
System.out.println(f3);
}
}
}
Output:
Enter the limit:
7
Fibonacci Series are:
0
1
1
2
3
5
8
10) Calculation of Simple Interest
import java.io.*;
class simpleinterest
{
public static void main(String args[])throws IOException
{
int p,n;
float r,si,amt;
DataInputStream in = new DataInputStream(System.in);
System.out.println(“Enter the principle amount:”);
p=Integer.parseInt(in.readLine());
System.out.println(“Enter the no. of years:”);
n=Integer.parseInt(in.readLine());
System.out.println(“Enter the rate of interest:”);
r=Float.parseFloat(in.readLine());
si=(p*n*r)/100;
amt=p+si;
System.out.println(“Simple Interest:” +si);
System.out.println(“Amount:” +amt);
}
}
Output:
Enter the principle amount:
1000
Enter the no. of years:
2
Enter the rate of interest:
2.5
Simple Interest:50.0
Amount:1050.0
11) Computation for Area of a Circle
class DoubleDemo
{
public static void main(String args[]) {
double pi, r, a;
r = 10.8; // radius of circle
pi = 3.1416; // pi, approximately
a = pi * r * r; // compute area
System.out.println(“Area of circle is ” + a);
}
}
Output:
Area of circle is 366.436224
12) Check whether the given number is prime or not
public static void main(String args[])throws IOException
{
int i,num,remainder;
DataInputStream in = new DataInputStream(System.in);
System.out.println(“Enter the number:”);
num=Integer.parseInt(in.readLine());
for(i=2;i<num;i++)
{
remainder=num%i;
if(remainder==0)
{
System.out.println(num + ” is not prime”);
break;
}
}
if(i==num)
{
System.out.println(num + ” is prime”);
}
}
}
Output:
Enter the number:
12
12 is not prime
13) Compute rightangledtriangle
import java.io.*;
public class rightangledtriangle
{
public static void main(String[] args) throws IOException
{
DataInputStream in = new DataInputStream(System.in);
int n;
System.out.println(“Enter the no. of rows:”);
n=Integer.parseInt(in.readLine());
for(int i=1;i<=n;i++)
{
for(int j=1;j<=i;j++)
{
System.out.print(” “+i+” “);
}
System.out.print(“\n”);
}
}
}
Output:
Enter the no. of rows:
5
The right angled triangle:
1
2 2
3 3 3
4 4 4 4
5 5 5 5 5
