JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS


Program: Write a program to check the given number is a prime number or not?


Description:

A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. A natural number greater than 1 that is not a prime number is called a composite number. For example, 5 is prime, as only 1 and 5 divide it, whereas 6 is composite, since it has the divisors 2 and 3 in addition to 1 and 6. The fundamental theorem of arithmetic establishes the central role of primes in number theory: any integer greater than 1 can be expressed as a product of primes that is unique up to ordering. This theorem requires excluding 1 as a prime.


Code:
package com.java2novice.algos;

public class MyPrimeNumCheck {

	public boolean isPrimeNumber(int number){
		
		for(int i=2; i<=number/2; i++){
			if(number % i == 0){
				return false;
			}
		}
		return true;
	}
	
	public static void main(String a[]){
		MyPrimeNumCheck mpc = new MyPrimeNumCheck();
		System.out.println("Is 17 prime number? "+mpc.isPrimeNumber(17));
		System.out.println("Is 19 prime number? "+mpc.isPrimeNumber(19));
		System.out.println("Is 15 prime number? "+mpc.isPrimeNumber(15));
	}
}

Output:
Is 17 prime number? true
Is 19 prime number? true
Is 15 prime number? false
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List Of All Interview Programs:

  1. Find out duplicate number between 1 to N numbers.
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  8. Write a program to find perfect number or not.
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  11. Wrie a program to find out duplicate characters in a string.
  12. Write a program to find top two maximum numbers in a array.
  13. Write a program to sort a map by value.
  14. Write a program to find common elements between two arrays.
  15. How to swap two numbers without using temporary variable?
  16. Write a program to print fibonacci series.
  17. Write a program to find sum of each digit in the given number using recursion.
  18. Write a program to check the given number is a prime number or not?
  19. Write a program to find the given number is Armstrong number or not?
  20. Write a program to convert binary to decimal number.
  21. Write a program to check the given number is binary number or not?
  22. Write a program for Bubble Sort in java.
  23. Write a program for Insertion Sort in java.
  24. Write a program to implement hashcode and equals.
  25. How to get distinct elements from an array by avoiding duplicate elements?
  26. Write a program to get distinct word list from the given file.
  27. Write a program to get a line with max word count from the given file.
  28. Write a program to convert string to number without using Integer.parseInt() method.
  29. Write a program to find two lines with max characters in descending order.
  30. Write a program to find the sum of the first 1000 prime numbers.
  31. Find longest substring without repeating characters.
  32. Write a program to remove duplicates from sorted array.
Knowledge Centre
What is OOPs?
Object oriented programming organizes a program around its data, i.e. , objects and a set of well defined interfaces to that data. An object-oriented program can be characterized as data controlling access to code.

About Author

My name is Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me at java2novice@gmail.com or you can comment on the page.

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Reference: Java™ Platform Standard Ed. 6 - API Specification | Java is registered trademark of Oracle.
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