java basic programs list
This article learn today java basic programs list. this article provides a java program that included hello java addition two number programs. included basic java programs list
1. Hello Word Program java program:
public class Main
{
public static void main(String[] args) {
System.out.println("Hello
World");
}
}
2. Area Calculate Program :
import java.util.Scanner;
class AreaOfRectangle {
public static void main (String[] args)
{
Scanner
scanner = new Scanner(System.in);
System.out.println("Enter the length of Rectangle:");
double
length = scanner.nextDouble();
System.out.println("Enter the width of Rectangle:");
double
width = scanner.nextDouble();
//Area =
length*width;
double
area = length*width;
System.out.println("Area of Rectangle is:"+area);
}
}
3. Add Two Number java program :
import java.util.Scanner;
class AddNumbers
{
public static void main(String args[])
{
int x, y, z;
System.out.println("Enter two integers to calculate their
sum");
Scanner in = new Scanner(System.in);
x = in.nextInt();
y = in.nextInt();
z = x + y;
System.out.println("Sum of the
integers = " + z);
}
}
4. Java Array java program:
import java.util.Scanner;
class ArmstrongNumber
{
public static void main(String args[])
{
int n, sum = 0, temp, remainder, digits =
0;
Scanner in = new Scanner(System.in);
System.out.println("Input a number
to check if it is an Armstrong number");
n = in.nextInt();
temp = n;
// Count number of digits
while (temp != 0) {
digits++;
temp = temp/10;
}
temp = n;
while (temp != 0) {
remainder = temp%10;
sum = sum + power(remainder, digits);
temp = temp/10;
}
if (n == sum)
System.out.println(n + " is an
Armstrong number.");
else
System.out.println(n + " isn't an
Armstrong number.");
}
static int power(int n, int r) {
int c, p = 1;
for (c = 1; c <= r; c++)
p = p*n;
return p;
}
}
5. Java Array java program:
class Testarray{
public static void
main(String args[]){
int a[]=new
int[5];//declaration and instantiation
a[0]=10;//initialization
a[1]=20;
a[2]=70;
a[3]=40;
a[4]=50;
//traversing array
for(int
i=0;i<="" pre="">
6.Date Time java program:
import java.util.*;
import java.text.*;
public class DateDemo {
public static void main(String args[]) {
Date dNow = new Date( );
SimpleDateFormat ft =
new SimpleDateFormat ("E yyyy.MM.dd
'at' hh:mm:ss a zzz");
System.out.println("Current Date:
" + ft.format(dNow));
}
}
7. Demonstration access control in java :
class Test
{
int a; // default access
public int b; // public
access
private int c; // private
access
// methods to access c
void setc(int i) // set c's value
{
c = i;
}
int getc() // get c's value
{
return c;
}
}
class assgn6
{
public static void
main(String args[])
{
Test ob = new Test();
// These are OK, a and b
may be accessed directly
ob.a = 10;
ob.b = 20;
// This is not OK and will
cause an error
// ob.c = 100; // Error!
// You must access c
through its methods
ob.setc(100); // OK
System.out.println("a,
b, and c: " + ob.a + " " +
ob.b + " " +
ob.getc());
}
8. Demonstration of classes and objects and method in java :
class Dog
{
// Instance Variables
String name;
String breed;
int age;
String color;
// Constructor Declaration
of Class
public Dog(String name,
String breed,
int age, String color)
{
this.name = name;
this.breed = breed;
this.age = age;
this.color = color;
}
// method 1
public String getName()
{
return name;
}
// method 2
public String getBreed()
{
return breed;
}
// method 3
public int getAge()
{
return age;
}
// method 4
public String getColor()
{
return color;
}
}
public class assgn3
{
public static void
main(String[] args)
{
Dog tuffy = new
Dog("tommy","labrador", 5, "white");
System.out.println("Hi
my name is "+ tuffy.getName()+
".\nMy breed,age and
color are " +
tuffy.getBreed()+","
+ tuffy.getAge()+
","+
tuffy.getColor());
}
}
9. Demonstration of inheritance using java (member access) java program:
class Vehicle
{
String vehicleType;
}
public class assgn10
extends Vehicle {
String modelType;
public void showDetail()
{
vehicleType = "Car"; //accessing Vehicle class member
modelType = "sports";
System.out.println(modelType+"
"+vehicleType);
}
public static void main(String[] args)
{
assgn10 car =new assgn10();
car.showDetail();
}
}
10.Even Or Odd Number java program:
import java.util.Scanner;
class OddOrEven
{
public static void main(String args[])
{
int x;
System.out.println("Enter an integer
to check if it is odd or even");
Scanner in = new Scanner(System.in);
x = in.nextInt();
if (x % 2 == 0)
System.out.println("The number is
even.");
else
System.out.println("The number is
odd.");
}
}
11. Factorial Number java program:
import java.util.Scanner;
class Factorial
{
public static void main(String[] args)
{
int no, fect=1;
Scanner s=new Scanner(System.in);
System.out.println("Enter any number
:");
no=s.nextInt();
for(int i=1; i<=no; i++)
{
fect=fect*i;
}
System.out.println("Factorial is :"
+fect);
}
}
12. Prime Number java program:
import java.util.*;
class PrimeNumbers
{
public static void main(String args[])
{
int n, status = 1, num = 3, count, j;
Scanner in = new Scanner(System.in);
System.out.println("Enter the number
of prime numbers you want");
n = in.nextInt();
if (n >= 1)
{
System.out.println("First
"+n+" prime numbers are:");
System.out.println(2);
}
for (count = 2; count <=n;)
{
for (j = 2; j <= Math.sqrt(num);
j++)
{
if (num%j == 0)
{
status = 0;
break;
}
}
if (status != 0)
{
System.out.println(num);
count++;
}
status = 1;
num++;
}
}
}
13. Palindrome java program:
import java.util.*;
class Palindrome
{
public static void main(String args[])
{
String original, reverse = "";
// Objects of String class
Scanner in = new Scanner(System.in);
System.out.println("Enter a string
to check if it is a palindrome");
original = in.nextLine();
int length = original.length();
for (int i = length - 1; i >= 0; i--)
reverse = reverse +
original.charAt(i);
if (original.equals(reverse))
System.out.println("The string is
a palindrome.");
else
System.out.println("The string
isn't a palindrome.");
}
}
14. Reverse String java program:
import java.util.*;
class ReverseString
{
public static void main(String args[])
{
String original, reverse = "";
Scanner in = new Scanner(System.in);
System.out.println("Enter a string
to reverse");
original = in.nextLine();
int length = original.length();
for (int i = length - 1 ; i >= 0 ;
i--)
reverse = reverse +
original.charAt(i);
System.out.println("Reverse of the
string: " + reverse);
}
}
15. Try Catch java program:
import java.util.Scanner;
class Excp
{
public static void main(String args[])
{
int a,b,c;
try
{
a=0;
b=10;
c=b/a;
System.out.println("This line will not
be executed");
}
catch(ArithmeticException e)
{
System.out.println("Divided by
zero");
}
System.out.println("After exception is
handled");
}
}
16. If else java program:
import java.util.Scanner;
class IfElse {
public static void main(String[] args) {
int marksObtained, passingMarks;
passingMarks = 40;
Scanner input = new Scanner(System.in);
System.out.println("Input marks scored
by you");
marksObtained = input.nextInt();
if (marksObtained >= passingMarks) {
System.out.println("You passed the
exam.");
}
else {
System.out.println("Unfortunately,
you failed to pass the exam.");
}
}
}
17. If else java program:
import java.util.Scanner;
class IfElse {
public static void main(String[] args) {
int marksObtained, passingMarks;
passingMarks = 40;
Scanner input = new Scanner(System.in);
System.out.println("Input marks scored
by you");
marksObtained = input.nextInt();
if (marksObtained >= passingMarks) {
System.out.println("You passed the
exam.");
}
else {
System.out.println("Unfortunately,
you failed to pass the exam.");
}
}
}
18. Do Loop java program:
package
com.journaldev.javadowhileloop;
public class
JavaDoWhileLoop {
public static void main(String[] args) {
int i = 5;
do {
System.out.println(i);
i++;
} while (i <= 10);
}
}
19. Do while Loop java program:
package
com.journaldev.javadowhileloop;
public class
DoWhileLoopExample {
public static void main(String args[]){
int i=10;
do{
System.out.println(i);
i--;
}while(i>1);
}
}
20. While Loop java program:
package
com.journaldev.javadowhileloop;
public class
WhileLoopExample {
public static void main(String args[]){
int i=10;
while(i>1){
System.out.println(i);
i--;
}
}
}
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