Best practice to find Duplicate Character from a String in java

This program could be the best way to find the number of duplicate characters from the given String. Here we are using Map and Set from java.util.Collections package. In the below program we are using Set to collect different characters from the given String. One boolean variable and one method named as findDuplicateChar(String myString) to find the duplicates. Also some known methods like toCharArray() to convert String to character array and for-each loop to iterate Set and Array. Better you can go through the given program to find duplicate characters from the given String.

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What are Generics in Java

In common term Generic means a common type of things or relating to a class or group of things not specific.

In Java Generics are introduced in 2004 within Java 5.0 features along with Enum, autoboxing and varargs , to provide compile time type-safety.Java Generic methods and generic classes enable programmers to specify, with a single method declaration, a set of related methods or, with a single class declaration, a set of related types, respectively.
What is type-safety?
It is just a check by compiler that correct Type(datatype) is used in correct place and there should not be any ClassCastException.

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Static Import in Java with an Example

What is Static Import:
Static Import is a feature added in Java 1.5(released in Sep 30 2004 almost 10 years back!) along with Var-args,Auto-Boxing and Auto-Unboxing, Generics, Enhanced for-loop,Enums,Scanner Class and Annotations. Using this Static Import feature we can import static members of a class and as well we can access all non-private static members without using class name from other classes.

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Core Java notes by Mr.Ratan from Durgasoft

Mr. Ratan is a faculty for Core Java from Durga Software Solutions. He covers all the topics in core java including AWT,Swings. He will give training for OCJP exam preparation tips in the Core Java class. This will be useful to write exam without preparing dumps. Mr.Ratan will explain the classes in slow manner to understand easily for beginners. You can watch a demo class of Mr.Ratan.

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Different type of Vararg rules in Java

While writing methods using variable arguments(var-args), we may confuse in different scenarios like where to put var-args in the parameters and how to place different type of arguments.Here we have given some rules with scenarios to understand easily. This will help you in the SCJP examination and as well, java interviews for freshers and experienced guys.

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OCJP and Core Java class notes by RamiReddy sir

RamiReddy sir is a Oracle Certified Professional and OCJP(SCJP) trainer. He is a good faculty in java for the beginners. He gives more example programs on core java to understand core java in depth.Before going to the Class notes he has given some interview tips and how to improve communication skills with real time java interview questions. His java class will start with basics and anyone can understand easily.

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