Wrapper Class In Java

-
Wraper classes in java
-----------------------------------------
There is a wrapper class for every primitive in Java. The wrapper class for int is Integer and the class for float is Float and so on. Wrapper classes also provide many utility functions for primitives like Integer.parseInt().
Ex: Write a method which will accept anything. We can write the method as
 public method(Object obj)
{
}
Now as all classes are children of Object class, their objects can be passed in the above program. However primitive types(like int,float...etc) are not children of Object and hence cannot be passed. We can wrap the primitives inside corresponding wrapper classes(like Integer,Float....etc) and then can pass to the function.

Comments

Post a Comment

Popular posts from this blog

Git Commands With Output Log

-
Step by step command only Guide where command starts with symbol $ ----------------------------- git config -- global user . name "your username"   git config -- global user . password "your password" Track file : This means the file is added to the git repository in your local machine. Also called added to the stage area. Untracked File : Code is still in your local folder not added to git repository ----------------------------------------------- Commands --------------------------- checking current working directory  rssan@DESKTOP-QA9A7TD MINGW64 ~ $ pwd /c/Users/rssan creating a new directory rssan@DESKTOP-QA9A7TD MINGW64 ~ $ mkdir test getting inside that newly created directory rssan@DESKTOP-QA9A7TD MINGW64 ~ $ cd test creating a new directory inside for git repository rssan@DESKTOP-QA9A7TD MINGW64 ~/test $ mkdir repo getting inside the newly created repo directory rssan@DESKTOP-QA9A7TD MINGW64 ~/test $ cd repo/ Again created a mygitrepo directory inside rss...
Read more

Java Interview Preparation (conceptual)

-
Image
 All Concepts sumerized .... ------------------------------------------------------------- *** Java is partially Object-oriented as it has primitive types. (Primitive i.e. int, float are not the objects, to convert them to use as Object, we use wrapper class) ***Java is platform-independent but JVM dependent. And JVM is platform dependent because for Linux there is a different JVM whereas for windows it's different. _-_____-----___--___--____--- Oo ps Conc ept  _-_____-----___--___--____--- abstraction ,  encapsulation ,  inheritance ,  polymorphism .  Inheritance : Real-World Example : Children have some of the qualities of their parents and grandparents or their ancestors. Java Example: There is a method in the parent class and you want the same method to create in a child class. Why create a new one if it already exists. As a child, you can inherit the method. There are a few variables in a class and you need them .So why to create new variables. We can ...
Read more

Java 8 Function Interface

-
Java.Util.Function ------------------------ Java.Util.Function added in java 8. So let's have a closer look into it. To go through the documentation click the below link. https://docs.oracle.com/javase/8/docs/api/java/util/function/package-summary.html The 4 important topics are , 1. Predicate 2. Consumer   3. Function 4. Supplier A youtube example for better understanding is :  https://www.youtube.com/watch?v=Tapz6_T5oHY Consumer :  --  two methods, accept(T t) and andThen() ** accept(T t) , returns void means no thing returned. It accepts only input. **andThen executes two consumers one after another. #java #java8 #java 8 #java.util.function #javaFunction #java function #java consumer #java predicate #java supplier #java lambda expression
Read more