Core java

In this post, we will see how to count number of decimal places in java. A Double can not have exact representation, you need to convert it to String to count number of decimal places in Java. There are multiple ways to count number of decimal places in java. Let’s go through them. Using String’s […]

[toc] TL;DR To return empty Array in Java, you can use curly braces. public static String[] returnEmptyStringArray() { String[] emptyArray = {}; return emptyArray; } or public static String[] returnEmptyStringArray() { return new String[]{}; } 1. Introduction In this article, we will take a look on to How to return Empty array in java. We […]

In this post, we will see how to fix IllegalArgumentException: Bound must be positive in java. You will generally get this exception while generating random numbers using Random.nextInt() method. If you pass bound as 0 or less than 0, then you will get the exception. Let’s understand with the help of example: package org.arpit.java2blog; import […]

In this post, we will see how to create List with One Element in java.. Using Collections.singletonList() This is best way to create List with single element if you need an immutable List. package org.arpit.java2blog; import java.util.Collections; import java.util.List; public class CreateListWithSingleElementJavaCollections { public static void main(String[] args) { List list = Collections.singletonList("India"); System.out.println("List: "+list); […]

1. Introduction to the Problem Statement In Java development, handling null values effectively is crucial, especially when dealing with strings. A common requirement is to replace null strings with empty strings to avoid NullPointerException and maintain the flow of the application. If the given string is null, the output should be an empty string; otherwise, the […]

In this post, we will see How to get String between two characters in java. Ways to get String between two characters in java. There are multiple ways to How to get String between two characters in java Using String’s substring() method To get String between two characters in java, use String’s substring() method. Find […]

In this post, we will see how to check if Date is weekend or weekday in Java. Please note that we will consider Saturaday/Sunday as weekend and rest five days of week as weekdays. Using LocalDate’s getDayOfWeek() method We can use LocalDate’s getDayOfWeek() method to check if given date is weekend or weekday in Java. […]

In this post, we will see how to remove extension from filename in java. Ways to Remove extension from filename in java There are multiple ways to remove extension from filename in java. Let’s go through them. Using substring() and lastIndexOf() methods You can first find last index of dot(.) using String’s lastIndexOf() method and […]

In this post, we will see how to write array to file in java. Ways to Write Array to File in Java There are different ways to write array to file in java. Let’s go through them. Using BufferWriter Here are steps to write array to file in java: Create new FileWriter and wrap it […]