Core Java Program Set 1
Program 1: First.java
public class First {
public static void main(String[] args) {
System.out.println("Welcome To Java!!!");
}
}
Program 2: Pyramid1.java
/*
Java Pyramid 1 Example
This Java Pyramid example shows how to generate pyramid or triangle like
given below using for loop.
*
**
***
****
*****
*/
public class Pyramid1 {
public static void main(String[] args) {
for(int i=1; i<= 5 ;i++){
for(int j=0; j < i;
j++){
System.out.print("*");
}
//generate a new line
System.out.println("");
}
}
}
Program 3: Pyramid2.java
/*
Java Pyramid 3 Example
This Java Pyramid example shows how to generate pyramid or triangle like
given below using for loop.
1
12
123
1234
12345
*/
public class JavaPyramid4 {
public static void main(String[] args) {
for(int i=1; i<= 5 ;i++){
for(int j=0; j < i;
j++){
System.out.print(j+1);
}
System.out.println("");
}
}
}
Program 4: Factorial.java
//Factorial Program using loop in java
class Factorial{
public static void main(String args[])
{
int i,
fact=1;
int number=5;//It is the number to calculate factorial
for(i=1;
i<=number; i++){
fact=fact*i;
}
System.out.println("Factorial of "+number+" is: "+fact);
}
}
Program 5: StringExample.java
//String Example in Java
public class StringExample
{
public
static void main(String[] args)
{
String s1 = "Computer Science";
int
x = 307;
String
s2 = s1 + " " + x;
String
s3 = s2.substring(10,17);
String
s4 = "is fun";
String
s5 = s2 + s4;
System.out.println("s1:
" + s1);
System.out.println("s2:
" + s2);
System.out.println("s3:
" + s3);
System.out.println("s4:
" + s4);
System.out.println("s5:
" + s5);
//showing
effect of precedence
x
= 3;
int
y = 5;
String
s6 = x + y + "total";
String
s7 = "total " + x + y;
String
s8 = " " + x + y + "total";
System.out.println("s6:
" + s6);
System.out.println("s7:
" + s7);
System.out.println("s8:
" + s8);
}
}
Program 6: AreaOfCircle.java
//WAP to calculate Area of Circle
import java.util.Scanner;
class AreaOfCircle
{
public static void main(String
args[])
{
Scanner s= new Scanner(System.in);
System.out.println("Enter the radius:");
double r= s.nextDouble();
double area=(22*r*r)/7 ;
//double area=3.14*r*r ;
System.out.println("Area of Circle is: " +
area);
}
}
Program 7: ElectricityBill.java
//Electricity Bill Program using class
import java.util.*;
class ElectricityBill
{
double
billpay;
CalculateElectricityBill(long
units)
{
if(units<100)
billpay=units*1.20;
else
if(units<=300)
billpay=100*1.20+(units-100)*2;
else
if(units>300)
billpay=100*1.20+ 200*2 +
(units-300)*3;
}
}
class ComputeElectricityBill
{
public
static void main(String args[])
{
long units;
Scanner sc=new Scanner(System.in);
System.out.println("enter number
of units");
units=sc.nextLong();
CalculateElectricityBill b=new
CalculateElectricityBill(units);
System.out.println("Bill to pay :
" + b.billpay);
}
}
Program 8: Vowel.java
//Java Program to Print Whether the Given
Alphabet is Vowel or Consonant
import java.util.Scanner;
class Vowel
{
public
static void main(String[ ] arg)
{
int i=0;
Scanner sc=new Scanner(System.in);
System.out.println("Enter a
character : ");
char ch=sc.next( ).charAt(0);
//char ch=sc.nextChar();
switch(ch)
{
case
'a' :
case 'e'
:
case 'i'
:
case 'o'
:
case 'u'
:
case
'A' :
case 'E'
:
case 'I'
:
case 'O'
:
case 'U'
:i++;
}
if(i==1)
System.out.println("Entered
character "+ch+" is
Vowel");
else if((ch>='a'&&ch<='z')||(ch>='A'&&ch<='Z'))
System.out.println("Entered
character "+ch+" is Consonent");
else
System.out.println("Not
an alphabet");
}
}
Program 9: Sum.java
//Calculate Sum of N Numbers Using While Loop
import java.util.Scanner;
class Sum
{
public
static void main(String arg[])
{
int
n,sum=0,i=0;
Scanner sc=new Scanner(System.in);
System.out.println("Enter how many
numbers you want sum");
n=sc.nextInt();
int a[]=new int[n];
System.out.println("Enter the
"+n+" numbers ");
while (i<n)
{
System.out.println("Enter number "+(i+1)+":");
a[i]=sc.nextInt();
sum+=a[i];
i++;
}
System.out.println("sum
is
="+sum);
}
}
Program 10: StudentInfo.java
//Display Student information using class
class Student
{
int
rno;
string
name;
double
per;
public
void getData()
{
rno=1;
name=”Piyush”;
per=82.67;
}
public
void dispData()
{
System.out.println(“ Student Information ”);
System.out.println(“----------------------------------”);
System.out.println(“Roll Number:” +
rno);
System.out.println(“Name :” + name);
System.out.println(“Percentage :” + per);
}
}
class StudentInfo
{
public
static void main(String arg[])
{
Student
s1 = new Student();
s1.getData();
s1.dispData();
}
}
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