Core java

In this tutorial, we will learn about single responsibility principle in java.It is one of SOLID principles and simplest design principle as well. Single responsibility principle dictates that there should be only one reason to change the class.If you have more than one reason to change the class then refactor the class into multiple classes according […]

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In this post, we will see how to reverse a number in java. Here is simple program to reverse a number. package org.arpit.java2blog; import java.util.Scanner; public class ReverseNumberMain { public static void main(String[] args) { int number, reversedNumber=0, remainder; Scanner scan = new Scanner(System.in); System.out.print("Enter a Number : "); number = scan.nextInt(); while(number != 0) […]

Runnable and Callable interface both are used in the multithreading environment.Callable is available in java.util.concurrent.Callable package and Runnable in java.lang.Thread. Difference between Runnable and Callable interface in java Runnable was introduced in java 1.0 version While Callable is an extended version of Runnable and introduced in java 1.5 to address the limitation of Runnable. Runnable […]

In this tutorial, we will see how to convert BigInteger to String in java. There are many ways to convert BigInteger to String in java.Some of them are: Using toString() Using String.valueOf() toString method We can simply use BigInteger’s toString method to convert BigInteger to String. package org.arpit.java2blog; import java.math.BigInteger; public class BigIntegerToStringMain { public […]

In this tutorial, we will see how to convert String to BigInteger in java. It is simple to convert String to BigInteger in java.We can simply use BigInteger’s constructor to convert String to BigInteger. BigInteger(String val) Above constructor convert String representation of BigInteger to BigInteger Let’s see this with the help of example: package org.arpit.java2blog; […]

In this tutorial we will see about BigDecimal‘s divide method. BigDecimal’s divide method is used to divide one BigDecimal by another. You can specify scale and rounding mode to get the output according to your need. There are 6 overloaded versions of divide method. Syntax BigDecimal divide ( BigDecimal divisor) BigDecimal divide ( BigDecimal divisor, […]

In this tutorial, we will see about BigDecimal‘s round method. BigDecimal’s round method is used to round the BigDecimal based on MathContext setting. Syntax public BigDecimal round ( MathContext mc) Return type returns BigDecimal rounded with MathContext setting BigDecimal round example Let’s understand BigDecimal method with the help of example import java.math.*; package org.arpit.java2blog; import […]

In this tutorial, we will see Java Random nextDouble method.It is used to generate random double. It returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator’s sequence. Syntax random.nextDouble() Here random is object of the java.util.Random class. Return returns random double. Example Let’s understand with the help […]