JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: Write a program to find the sum of the first 1000 prime numbers.


Description:

Write a program to find the sum of the first 1000 prime numbers.


Code:
package com.primesum;

public class Main {

	public static void main(String args[]){
		
		int number = 2;
		int count = 0;
		long sum = 0;
		while(count < 1000){
			if(isPrimeNumber(number)){
				sum += number;
				count++;
			}
			number++;
		}
		System.out.println(sum);
	}
	
	private static boolean isPrimeNumber(int number){
		
		for(int i=2; i<=number/2; i++){
            if(number % i == 0){
                return false;
            }
        }
        return true;
	}
}

Output:
3682913
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  20. Write a program to convert binary to decimal number.
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  22. Write a program for Bubble Sort in java.
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  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.
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Knowledge Centre
Inner class and Anonymous class
Inner class: classes defined in other classes, including those defined in methods are called inner classes. An inner class can have any accessibility including private.

Anonymous class: Anonymous class is a class defined inside a method without a name and is instantiated and declared in the same place and cannot have explicit constructors.

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