Tag: java

Autoboxing and Unboxing in Java

Post author By Okay
Post date May 7, 2017

In java, we often need to convert primitive types to their object(boxed wrappers) counterparts or vice versa. Unfortunately, doing these conversions all the time is tedious and make code verbose. For this reason, Java 1.5 introduced two concepts, autoboxing and unboxing, that automate these conversions.

Autoboxing: It is the process of converting primitives to their corresponding object type automatically.

Unboxing:It is the process of converting object types to their corresponding primitives automatically.

Tags autoboxing, java, unboxing

Software

Understanding equals and hashcode in Java

Post author By Okay
Post date January 29, 2016

In Java, Object class has two identity methods called equals and hashcode. We usually override them in our classes to achieve equality. Understanding the underlying mechanism of equals and hashcode can be crucial in some cases. Let’s take a brief look at what they are used for.

Tags equals, hashcode, java

Software

Argument passing in Java

Post author By Okay
Post date February 26, 2015

Argument passing in Java is simple but sometimes confusing. Let’s go over some concepts briefly before diving into it.

If you come from a C/C++ programming background, you’ve probably heard of the “Call By Value” and “Call By Reference” argument passing concepts.

Briefly,

Call by Value : A copy of the object instance is passed to called method. Any modifications made on the object inside the method will not be reflected back to the original object.
Call by Reference : A reference to the original object is passed to called function. This reference may be thought as an alias for the original object and any modification done on the alias object inside the method actually done on the original object.

Tags call by value, java