Sum of Digits
Logic: 513 -> 5+1+3=9
nresnsum
5130
513%1033
513/10513
51%1014
51/1054
5%1059
5/1009
ProgramOutput
//Note: Scanner class work with JDK1.5 or above
import java.util.*;
class SumDigits
{
public static void main(String args[])
{
int n, res;
Scanner scan= new Scanner(System.in);
System.out.println("Please Enter No.: ");
n1=scan.nextInt();
while(n>0)
...
Write a program to find whether no. is palindrome or not.
class Palindrome{ public static void main(String args[]){ int num = Integer.parseInt(args[0]); int n = num; //used at last time check int...
Write a program to find whether given no. is Armstrong or not.
/*
Example :
Input - 153
Output - 1^3 + 5^3 + 3^3 = 153, so it is Armstrong no. */
class Armstrong{ public static void main(String...
Write a program to Display Invert Triangle.
/*
Example:
Input - 5
Output :
5 5 5 5 5
4 4 4 4
3...
Write a program to generate a Triangle.
/*
eg:
1
2 2
3 3 3
4 4 4 4 and so on as per user given number */
class Triangle{
public static void main(String args[]){
int num = Integer.parseInt(args[0]);
for(int...
Biggest of 3 Numbers using Logical Operators
Program
Output
//Note: Scanner class work with JDK1.5 or aboveimport java.util.*;class Biggest3{ public static void main(String args[]) { int n1, n2, n3, big; Scanner scan= new Scanner(System.in); System.out.println("Please Enter No 1: "); n1=scan.nextInt(); System.out.println("Please Enter No 2: "); n2=scan.nextInt(); ...
Program For Factorial Numbers
Logic: Factorial of 5 = 5 x 4 x 3 x 2 x 1
prodnprod
prod*n
155
5420
20360
602120
1201120
ProgramOutput
//Note: Scanner class work with JDK1.5 or above
import java.util.*;
class Factorial
{
public static void main(String args[])
{
int n, i, prod=1;
Scanner scan= new Scanner(System.in);
System.out.println("Please Enter a No.");
...
Fibonacci Series ( 1 1 2 3 5 8 13...)
Logic: Sum of previous two numbers will give us next number.
prevnextsum
shifted to prevshifted to next
112
123
235
358
5813
813...
13......
prev will give you fibonacci series
ProgramOutput
class Fibonacci
{
public static void main(String args[])
{
int prev, next, sum, n;
prev=next=1
for(n=1;n<=10;n++)
...
Prime Number
Logic: Prime Number are divisible by itself only.
Not divisible by any NumberDivisible by 2 ...no need to check furtherDivisible by 3 ...no need to check further
7%2=17%3=17%4=37%5=27%6=18%2=08%3=8%4=8%5=8%6=8%7=9%2=19%3=09%49%59%69%79%8
Numbers are not divisible by more than half of the number
No need to check upto 6 check upto 3 only No need to check upto...
Difference between Post Increment (n++) and Pre Increment (++n)
Post Increment (n++): It increases the value of variable by 1 after execution of the statement.
Pre Increment (++n): It increases the value of variable by 1 before execution of the statement.
ProgramOutput
class Demo
{
public static void main(String args[])
{
int n=10;
System.out.println(n);
System.out.println(n++);
...
Difference between BufferedReader and Scanner class
Even though both BufferedReader and Scanner can read a file or user input from command prompt in Java, there some significant differences between them. One of the main difference between BufferedReader and Scanner class...
Setting of JAVA_HOME and PATH in Linux
The JAVA_HOME environment variable points to the JDK installation directory and used by many Java tools and applications like Eclipse, Maven, ANT, Tomcat etc. to figure out Java executables as they need Java for running. Unfortunately,...
