Below are the collection of java program. Hope this Java Program for interview help you to crack the interview of dream company
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Write a java program to Convert Binary to Decimal
package com.onurdesk.basic.interview.programs;
import java.io.*;
class BinaryToDecimal
{
public static void main(String[] args) throws Exception
{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter Binary no. to convert in Decimal : ");
String number = br.readLine();
/*
to convert Binary number to decimal number use,
int parseInt method of Integer wrapper class.
Pass 2 as redix second argument.
*/
int decimalNumber = Integer.parseInt(number, 2);
System.out.println("Binary number converted to decimal number");
System.out.println("Decimal number is : " + decimalNumber);
}
}
Write a java program to Convert Binary to Octal
import java.io.*;
class BinaryToOctal
{
public static void main(String[] args) throws Exception
{
String num = null;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter binary number : ");
num = br.readLine();
int dec = Integer.parseInt(num, 2);
String oct = Integer.toOctalString(dec);
System.out.println("Binary " + num + " in Octal is " + oct);
}
}
Write a java program to Convert Decimal to Binary
package com.onurdesk.basic.interview.programs;
import java.util.Scanner;
class DecimalToBinary {
public String toBinary(int n) {
if (n == 0) {
return "0";
}
String binary = "";
while (n > 0) {
int rem = n % 2;
binary = rem + binary;
n = n / 2;
}
return binary;
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int decimal = scanner.nextInt();
DecimalToBinary decimalToBinary = new DecimalToBinary();
String binary = decimalToBinary.toBinary(decimal);
System.out.println("The binary representation is " + binary);
}
}
Write a java program to Convert Decimal to Binary
import java.util.Scanner;
class DecimalToBinary
{
public String toBinary(int n)
{
if (n == 0)
{
return "0";
// Java Program for interview
}
String binary = "";
while (n > 0)
{
int rem = n % 2;
binary = rem + binary;
n = n / 2;
}
return binary;
}
public static void main(String[] args)
{
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int decimal = scanner.nextInt();
DecimalToBinary decimalToBinary = new DecimalToBinary();
String binary = decimalToBinary.toBinary(decimal);
System.out.println("The binary representation is " + binary);
}
}
Write a java program to Find Fraction Addition in java
package com.onurdesk.basic.interview.programs;
import java.util.*;
class FractionAdding {
public static void main(String args[]) {
float a, b, c, d;
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a : ");
a = scanner.nextFloat();
System.out.print("Enter b : ");
b = scanner.nextFloat();
System.out.print("Enter c : ");
c = scanner.nextFloat();
System.out.print("Enter d : ");
d = scanner.nextFloat();
// Java Program for interview
// fraction addition formula ((a*d)+(b*c))/(b*d)
System.out.print("Fraction Addition : [( " + a + " * " + d + " )+( " + b + " * " + c + " ) / ( " + b + " * " + d
+ " )] = " + (((a * d) + (b * c)) / (b * d)));
}
}
Write a java program to Find Fraction Subtraction
package com.onurdesk.basic.interview.programs;
import java.util.*;
class FractionSubtraction {
public static void main(String args[]) {
float a, b, c, d;
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a : ");
a = scanner.nextFloat();
System.out.print("Enter b : ");
b = scanner.nextFloat();
System.out.print("Enter c : ");
c = scanner.nextFloat();
System.out.print("Enter d : ");
d = scanner.nextFloat();
// fraction addition formula ((a*d)-(b*c))/(b*d)
System.out.print("Fraction subtraction : [( " + a + " * " + d + " )-( " + b + " * " + c + " ) / ( " + b + " * "
+ d + " )] = " + (((a * d) - (b * c)) / (b * d)));
// Java Program for interview
}
}
Write a java program to Find GCDLCM.
import java.util.Scanner;
class GCDLCM
{
public static void main(String args[])
{
int x, y;
Scanner sc = new Scanner(System.in);
System.out.println("Enter the two numbers: ");
x = sc.nextInt();
y = sc.nextInt();
System.out.println("GCD of two numbers is : " + gcd(x, y));
System.out.println("LCM of two numbers is : " + lcm(x, y));
}
static int gcd(int x, int y)
{
int r = 0, a, b;
a = (x > y) ? x : y; // a is greater number
b = (x < y) ? x : y; // b is smaller number
r = b;
while (a % b != 0)
{
r = a % b;
a = b;
b = r;
}
return r;
}
static int lcm(int x, int y)
{
int a;
a = (x > y) ? x : y; // a is greater number
while (true)
{
if (a % x == 0 && a % y == 0)
{
return a;
}
++a;
}
}
}
Write a java program to Find Harmonic Series.
class HarmonicSeries
{
public static void main(String args[])
{
int num, i = 1;
double rst = 0.0;
Scanner in = new Scanner(System.in);
System.out.println("Enter the number for length of series");
num = in.nextInt();
// Java Program for interview
while (i <= num)
{
System.out.print("1/" + i + " +");
rst = rst + (double) 1 / i;
i++;
}
System.out.println("\n\nSum of Harmonic Series is " + rst);
}
}
Write a java program to Create a Multiplication Table
package com.onurdesk.basic.interview.programs;
import java.util.Scanner;
class MultiplicationTable {
public static void main(String args[]) {
int n, c;
System.out.println("Enter an integer to print it's multiplication table");
Scanner in = new Scanner(System.in);
n = in.nextInt();
System.out.println("Multiplication table of " + n + " is :-");
for (c = 1; c <= 10; c++) {
System.out.println(n + "*" + c + " = " + (n * c));
}
}
}
Write java program for Alphabet Pattern in Java
package com.onurdesk.basic.interview.programs;
import java.util.*;
class AlphabetPattern
{
public static void main(String[] arg)
{
int line, row, col;
char ch = 'A';
Scanner scanner = new Scanner(System.in);
System.out.print("Enter number of lines : ");
line = scanner.nextInt();
for (row = 1; row <= line; row++)
{
for (col = 1; col <= row; col++)
{
System.out.print("" + ch);
}
System.out.println();
ch++;
}
}
}Write a java program Binary Pattern
class BinaryPattern
{
public static void main(String s[])
{
int i, j;
int count = 1;
for (i = 1; i <= 5; i++)
{
for (j = 1; j <= i; j++)
{
System.out.format("%d", count++ % 2);
if (j == i && i != 5)
System.out.println("");
}
if (i % 2 == 0)
count = 1;
else
count = 0;
}
}
}
Write a program for Christmas tree pattern java.
package com.onurdesk.basic.interview.programs;
class ChristmasTree {
public static final int segments = 4;
public static final int height = 4;
public static void main(String[] args) {
makeTree();
}
public static void makeTree() {
int maxStars = 2 * height + 2 * segments - 3;
String maxStr = "";
for (int l = 0; l < maxStars; l++) {
maxStr += " ";
}
for (int i = 1; i <= segments; i++) {
for (int line = 1; line <= height; line++) {
String starStr = "";
for (int j = 1; j <= 2 * line + 2 * i - 3; j++) {
starStr += "*";
}
for (int space = 0; space <= maxStars - (height + line + i); space++) {
starStr = " " + starStr;
}
System.out.println(starStr);
}
}
for (int i = 0; i <= maxStars / 2; i++) {
System.out.print(" ");
}
System.out.println(" " + "*" + " ");
for (int i = 0; i <= maxStars / 2; i++) {
System.out.print(" ");
}
System.out.println(" " + "*" + " ");
for (int i = 0; i <= maxStars / 2 - 3; i++) {
System.out.print(" ");
}
System.out.println(" " + "*******");
}
}
Write a program Christmas tree pattern in Java
class ChristmasTreePattern
{
public static void main(String[] arg)
{
drawChristmasTree(4);
}
private static void drawChristmasTree(int n)
{
for (int i = 0; i < n; i++)
{
triangle(i + 1, n);
}
}
private static void triangle(int n, int max)
{
for (int i = 0; i < n; i++)
{
for (int j = 0; j < max - i - 1; j++)
{
System.out.print(" ");
}
for (int j = 0; j < i * 2 + 1; j++)
{
System.out.print("X");
}
System.out.println("");
}
}
}
Write a program for Floyd Triangle in java
import java.util.Scanner;
class FloydTriangle
{
public static void main(String args[])
{
int n, num = 1, c, d;
Scanner in = new Scanner(System.in);
System.out.print("Enter the number of rows of floyd's triangle : ");
n = in.nextInt();
System.out.println("Floyd's triangle :-");
for (c = 1; c <= n; c++)
{
for (d = 1; d <= c; d++)
{
System.out.print(num + " ");
num++;
}
System.out.println();
}
}
}
Write a program for the below number pattern in java
1
12
123
1234
12345package com.onurdesk.basic.interview.programs;
class NumberPat1 {
public static void main(String arg[]) {
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(j);
}
System.out.println();
}
}
}
Write a program for the below number pattern in java
54321
5432
543
54
5class NumberPat2
{
public static void main(String arg[])
{
for (int i = 1; i <= 5; i++)
{
for (int j = 5; j >= i; j--)
{
System.out.print(j);
}
System.out.println();
}
}
}
Write a program for the below number pattern in java
12345
1234
123
12
1
package com.onurdesk.numberpattern.program;
class NumberPat3 {
public static void main(String arg[]) {
for (int i = 1, r = 5; i <= 5; i++, r--) {
for (int j = 1; j <= r; j++) {
System.out.print(j);
}
System.out.println();
}
System.out.println("Thanks for visiting https://onurdesk.com");
}
}
Write a program for the below number pattern in java
1
12
123
1234
12345
1234
123
12
1package com.onurdesk.numberpattern.program;
/**
* @author Onurdesk
*
* Thanks for visiting https://onurdesk.com like us on facebook :
* https://facebook.com/onurdesk
*/
class NumberPat4 {
public static void main(String arg[]) {
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(j);
}
System.out.println();
}
for (int i = 1, r = 5 - 1; i <= 5 - 1; i++, r--) {
for (int j = 1; j <= r; j++) {
System.out.print(j);
}
System.out.println();
}
System.out.println("Thanks for visiting https://onurdesk.com");
}
}
Write a program for the below number pattern in java.
12345
1234
123
12
1
12
123
1234
12345package com.onurdesk.numberpattern.program;
class NumberPat5
{
/**
* @author Onurdesk
*
* Thanks for visiting https://onurdesk.com like us on facebook :
* https://facebook.com/onurdesk
*/
public static void main(String arg[])
{
for (int i = 1, r = 5; i <= 5; i++, r--)
{
for (int j = 1; j <= r; j++)
{
System.out.print(j);
}
System.out.println();
}
for (int i = 1; i <= 5; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print(j);
}
System.out.println();
}
System.out.println("Thanks for visiting https://onurdesk.com");
}
}
.
Write a program for the below number pattern in java.
1
22
333
4444
55555package com.onurdesk.numberpattern.program;
class NumberPat6
{
/**
* @author Onurdesk
*
* Thanks for visiting https://onurdesk.com like us on facebook :
* https://facebook.com/onurdesk
*/
public static void main(String arg[])
{
for(int i=1;i<=5;i++)
{
for(int j=1;j<=i;j++)
{
System.out.print(i);
}
System.out.println();
}
System.out.println("Thanks for visiting https://onurdesk.com");
}
}Write a program for the below number pattern in java.
1
23
456
7890
12345package com.onurdesk.numberpattern.program;
class NumberPat7
{
/**
* @author Onurdesk
*
* Thanks for visiting https://onurdesk.com like us on facebook :
* https://facebook.com/onurdesk
*/
public static void main(String arg[])
{
int t = 1;
for (int i = 1; i <= 5; i++)
{
for (int j = 1; j <= i; j++)
{
if (t == 10) {
t = 0;
}
System.out.print(t++);
}
System.out.println();
}
System.out.println("Thanks for visiting https://onurdesk.com");
}
}
Write a program for the below number pattern in java.
5
11111
0000
111
00
1package com.onurdesk.numberpattern.program;
import java.util.Scanner;
class Pattern
{
/**
* @author Onurdesk
*
* Thanks for visiting https://onurdesk.com like us on facebook :
* https://facebook.com/onurdesk
*/
public static void main(String args[])
{
int n, i, j;
Scanner sc = new Scanner(System.in);
System.out.println("Enter the number of rows ");
n = sc.nextInt();
for (i = 1; i <= n; i++)
{
for (j = i; j <= n; j++)
{
if (i % 2 == 0)
System.out.print("0");
else
System.out.print("1");
}
System.out.println();
}
System.out.println("Thanks for visiting https://onurdesk.com");
}
}
Write a program for the below number pattern in java.
1
1 2 1
1 2 3 2 1
1 2 3 4 3 2 1
1 2 3 4 5 4 3 2 1package com.onurdesk.numberpattern.program;
class PrintPattern
{
/**
* @author Onurdesk
*
* Thanks for visiting https://onurdesk.com like us on facebook :
* https://facebook.com/onurdesk
*/
public static void main(String args[])
{
int n = 5;
for (int i = 1; i <= n; i++)
{
int j = n - i;
while (j > 0)
{
System.out.print(" ");
j--;
}
j = 1;
while (j <= i)
{
System.out.print(" " + j);
j++;
}
j = i - 1;
while (j > 0)
{
System.out.print(" " + j);
j--;
}
System.out.println( );
j = n - i;
while (j > 0)
{
System.out.print(" ");
j--;
}
System.out.println();
}
System.out.println("Thanks for visiting https://onurdesk.com");
}
}
Write a program for the below number pattern in java.
1
121
12321
1234321
123454321
12345654321
1234567654321
package com.onurdesk.numberpattern.program;
import java.util.*;
class Patternpat2
/**
* @author Onurdesk
*
* Thanks for visiting https://onurdesk.com like us on facebook :
* https://facebook.com/onurdesk
*/
{ public static void main(String[] args){
int i, j, k = 1, l, n;
Scanner sc = new Scanner(System.in);
System.out.println("Enter the number of levels of pattern");
n = sc.nextInt();
System.out.println("\nPattern is : \n");
for (i = 1; i <= n; i++)
{
l = i;
for (j = 1; j <= k; j++)
{
if (j >= i + 1)
{
System.out.print(--l);
}
else
{
System.out.print(j);
}
}
k = k + 2;
System.out.println(" ");
}
System.out.println("Thanks for visiting https://onurdesk.com");
}
}Write a program for the below star pattern in java.
****
***
**
*package com.onurdesk.numberpattern.program;
class StarPattern1
{
/**
* @author Onurdesk
*
* Thanks for visiting https://onurdesk.com like us on facebook :
* https://facebook.com/onurdesk
*/
public static void main(String arg[])
{
for (int i = 1; i <= 5; i++)
{
for (int j = i; j <= 5; j++)
{
System.out.print("*");
}
System.out.println();
}
System.out.println("Thanks for visiting https://onurdesk.com");
}
}
Write a program for the below star pattern in java.
*
**
***
****
*****package com.onurdesk.numberpattern.program;
class StarPattern2
{
/**
* @author Onurdesk
*
* Thanks for visiting https://onurdesk.com like us on facebook :
* https://facebook.com/onurdesk
*/
public static void main(String arg[])
{
for (int i = 1; i <= 5; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print("*");
}
System.out.println();
}
System.out.println("Thanks for visiting https://onurdesk.com");
}
}
Write a program for the below star pattern in java.
*****
****
***
**
*
*
**
***
****
*****package com.onurdesk.numberpattern.program;
class StarPattern3
{
/**
* @author Onurdesk
*
* Thanks for visiting https://onurdesk.com like us on facebook :
* https://facebook.com/onurdesk
*/
public static void main(String arg[])
{
for (int i = 1; i <= 5; i++)
{
for (int j = i; j <= 5; j++)
{
System.out.print("*");
}
System.out.println();
}
for (int i = 1; i <= 5; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print("*");
}
System.out.println();
}
System.out.println("Thanks for visiting https://onurdesk.com");
}
}
Write a program for the below star pattern in java.
* *
** **
*** ***
**** ****
***** *****
************package com.onurdesk.numberpattern.program;
class StarPattern4
{
public static void main(String arg[])
{
int num = 12;
int f = 2;
int g = num - 1;
for (int i = 1; i <= (num / 2); i++)
{
for (int j = 1; j <= num; j++)
{
if (j >= f && j <= g)
{
System.out.print(" ");
}
else
{
System.out.print("*");
}
}
f = f + 1;
g = g - 1;
System.out.println();
}
}
}
Write a program for the below star pattern in java.
*
**
***
****
*****
*****
****
***
**
*package com.onurdesk.numberpattern.program;
class StarPattern5
{
public static void main(String arg[])
{
for (int i = 1; i <= 5; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print("*");
}
System.out.println();
}
for (int i = 1; i <= 5; i++)
{
for (int j = i; j <= 5; j++)
{
System.out.print("*");
}
System.out.println();
}
}
}
Write a program for the below star pattern in java.
6
*
***
*****
*******
*********
***********
package com.onurdesk.numberpattern.program;
import java.io.*;
class Triangle
{
public static void main(String arg[])
{
InputStreamReader istream = new InputStreamReader(System.in);
BufferedReader read = new BufferedReader(istream);
System.out.println("Enter Triangle Size : ");
int num = 0;
try
{
num = Integer.parseInt(read.readLine());
}
catch (Exception Number)
{
System.out.println("Invalid Number!");
}
for (int i = 1; i <= num; i++)
{
for (int j = 1; j < num - (i - 1); j++)
{
System.out.print(" ");
}
for (int k = 1; k <= i; k++)
{
System.out.print("*");
for (int k1 = 1; k1 < k; k1 += k)
{
System.out.print("*");
}
}
System.out.println();
}
}
}
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