java Archives - Page 9 of 12

Exception Handling in Java with Examples

January 12, 2023 by manish

To learn about exception handling first you must know what is an exception What is an Exception in Java An exception is run time error that can occur due to wrong user input or due to logical error in programming. Arithmetic Exception Example Consider a simple example. Take two integer number from command prompt and … Read more

How to get the length of the 2D array in Java

January 12, 2023 by manish

Two dimensional array in java To declare an 2D array in java we use the following syntax Datatype [][] arrayName=new Datatype[rows][cols] If you want to declare any primitive 2D array. int [][] ages=new int[3][4]; double [][] prices=new double[4][4] Array ages is a two-dimensional int array, it can store 3 rows and each row can contain … Read more

Print prime numbers from 1 to n in java

January 12, 2023January 11, 2023 by manish

Print prime numbers from 1 to n in java using while loop

import java.util.Scanner;
 
public class PrimeNumberChecker {
 
    public static void main(String[] args) {
        System.out.println("Enter a  number n");
        Scanner scanner = new Scanner(System.in);
        int number1 = 1;
        int number2 = scanner.nextInt();
 
        if (number1 >= number2) {
            System.out.println("Number2 must be greater then number1");
            System.exit(0);
        }
        while (number1 <= number2) {
            int i = 2, count = 0;
            while (i <= number1 / 2) {
                if (number1 % i == 0) {
                    count++;
                    break;
                }
                i++;
 
            }
            if (count == 0) {
                System.out.println(number1 + " is prime number");
            }
            number1++;
        }
    }
}

import java.util.Scanner;

public class PrimeNumberChecker {

public static void main(String[] args) {

System.out.println("Enter a number n");

Scanner scanner = new Scanner(System.in);

int number1 = 1;

int number2 = scanner.nextInt();

if (number1 >= number2) {

System.out.println("Number2 must be greater then number1");

System.exit(0);

}

while (number1 <= number2) {

int i = 2, count = 0;

while (i <= number1 / 2) {

if (number1 % i == 0) {

count++;

break;

}

i++;

}

if (count == 0) {

System.out.println(number1 + " is prime number");

}

number1++;

}

Enter a  number n
100
1 is prime number
2 is prime number
3 is prime number
5 is prime number
7 is prime number
11 is prime number
13 is prime number
17 is prime number
19 is prime number
23 is prime number
29 is prime number
31 is prime number
37 is prime number
41 is prime number
43 is prime number
47 is prime number
53 is prime number
59 is prime number
61 is prime number
67 is prime number
71 is prime number
73 is prime number
79 is prime number
83 is prime number
89 is prime number
97 is prime number

Enter a number n

100

1 is prime number

2 is prime number

3 is prime number

5 is prime number

7 is prime number

11 is prime number

13 is prime number

17 is prime number

19 is prime number

23 is prime number

29 is prime number

31 is prime number

37 is prime number

41 is prime number

43 is prime number

47 is prime number

53 is prime number

59 is prime number

61 is prime number

67 is prime number

71 is prime number

73 is prime number

79 is prime number

83 is prime number

89 is prime number

97 is prime number

Read More Prime Number Program In Java Using While Loop

Exception Handling try catch finally blocks in Java

January 12, 2023January 11, 2023 by manish

What is try block A try block is used to surround a set of statements where exceptions may occur. A try block used with catch and finally block Also Read Exception Handling in Java: Hierarchy Example and Types What is a catch block A catch block is created followed by a try block. Whenever an … Read more

Throw and Throws Keywords in Java

January 12, 2023January 11, 2023 by manish

In java programming, If the exception occurs within the try block it is thrown. Throw and Throws Keywords in Java is very important to throw exceptions. a throw keyword is used to throw an exception A system-generated exception is automatically thrown by the java run time system but if we want to manually throw an … Read more

Java Scanner Class Getting Input from user and file

January 12, 2023January 11, 2023 by Manish Sahu

Java Scanner class is used to take input from users and file. Scanner class is defined as java.util.Scanner It is defined as a final class and extends the Object class and implements Iterator<String> and Closeable interface.

public final class Scanner
extends Object
implements Iterator<String>, Closeable

public final class Scanner

extends Object

implements Iterator<String>, Closeable

Scanner class reads data in form of tokens and break token based on the delimiter the default delimiter … Read more

Methods in Java-how to call a method in java

January 12, 2023January 11, 2023 by manish

Introducing Method In java programming language classes usually consist of two things instance variable and methods. What is a method in java A method is the block of statements that performs a special task. Using methods we can avoid rewriting the same code over and over in a sane program. The method increases the … Read more

Checking whether a file or directory in Java

February 2, 2023January 2, 2023 by Manish Sahu

Checking whether the File object exists if exists then check whether it is file of directory to check file existance exists() method of File class is used if it returns true means file or directory exists, at this point we are not confirm existing File object is file or directory. To check file object isDirectory() … Read more

Harshad numbers

September 13, 2022June 23, 2022 by manish

In this universe, we know that the number system is the base of every mathematical model. When we talk about programming, we do deal with numbers and a way to manipulate the data variables through in-built functions and modules. Lots of concepts are there from which one is a Harshad Number. Another name of Harshad … Read more

Thread Life Cycle in Java

April 30, 2021April 30, 2021 by manish

Thread Life Cycle in Java tells the various information of thread form born to terminate. Thread life cycle contains the several stages and at a time any thread can be present in a single state. States of Thread life cycle Born Ready Running Blocked Sleep Wait Dead Ready: In this state thread is ready to … Read more