Core java

In this post, we will about Objects class’s isNull method. Objects’s isNull() method is used to check if object is null or not. java.util.Objects class was introduced in java 7. Here is simple example for Object's isNull method. [crayon-6a295a5f81118472343723/] Output: Is str1 null: false Is str2 null: true Let’s look at source code Object’s isNull() […]

In this post, we will see about Java 8 PriorityQueue. When the objects are supposed to be processed on the basis of their priority, in that scenario we use PriorityQueue. It’s a special type of queue (also, unbound queues) where the elements can be ordered either as per their natural ordering or based on a […]

In this post, we will see about new line character in java and how to add new line character to a String in different operating systems. Operating systems have different characters to denote the end of the line. Linux and new mac: In Linux, the end line is denoted by \n, also known as line […]

In this post, we will see how to solve Unable to execute jar- file: “no main manifest attribute”. Problem When you have a self-executable jar and trying to execute it. You might get this error. Unable to execute jar- file: “no main manifest attribute” Solution Maven You might get this error when Main-Class entry is […]

In this post, we will see different ways to read file line by line in java. Sometimes, we need to read file line by line to a String, and process it. Here are different ways to read file line by line in java. Java 8 Streams Java 8 has introduced a new method called lines() […]

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