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I am a fresher and I want to become a Java developer, so what is necessary to crack the Java interview ? 

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IT Courses/Java/Core Java IT Courses/Java

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IT Professional Trainer with 4 years of experience in Computer and IT Engineering .

For an interview, you should prepare all the basic questions of Java , class, function and OOP concepts.
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Professional Language & IT Skills Trainer

Hi Dipesh, understand that Java is a kind of ocean. It is vast. For interview preparation, you can brush up your Core Java Concepts and OOPs concepts and understand how JAVA works and learn the java features and how Java achieves it. Understand JVM, JDK, JRE, Bytecode, Java program life cycle, Classes,... read more

Hi Dipesh, understand that Java is a kind of ocean. It is vast. For interview preparation, you can brush up your Core Java Concepts and OOPs concepts and understand how JAVA works and learn the java features and how Java achieves it. Understand JVM, JDK, JRE, Bytecode, Java program life cycle, Classes, Objects, Overloading/Overriding concepts, String, Multi-Threading concepts, etc.

Do a lot of coding in Java, do more projects using Java, participate in coding challenges on Hacker Rank, Code chef, Code raunch etc. This will enhance your java skills, and you will get a good grip on programming in Java. You can see yourself that Java can be learnt very quickly just by doing it more and giving time for it every day. Once you try and experience your coding and outputs, you will have a fair idea and confidence in front of the interviewer to tell about your java skills.

Just give time and learn. Nowadays, so many platforms are available online, for learning Java.
I wish you all the best, and I am sure you can do well. I hope this answers your confusions.

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Trainer

Learn core Java and advanced Java, get in touch with senior Java developers and ask them about the issues they have faced in their experience and also Google it for interview questions and answers.
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Interviewers prefer your problem-solving skills. If you are better at C++, you can go ahead.
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IT Professional Trainer with 15 years of experience in IT Industry

You need to focus more on Core Java, Java objects, access modifiers,Oops in java,JDBC, Java collection objects and basics of web prgramming through Java with JSP.
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Hi Dipesh,If you want to become a Java developer, prepare the basic Object-Oriented Programming Concepts. Once you get proficiency in this OOPs concept, everything will be easy (It will not take much time understanding) for you. Practice with different programs (basic).
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Hi Dipesh, You need to prepare Core Java, JSP and servlet at least to crack Java developer interview. You will require a lot of practical knowledge to break it.
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Fore backend:First, you have to complete core Java with Collection, Multithreading, JDBC and OOPS especially.Then prepare Advance java (Servlet & JSP) after that Prepare any database like MySQL.For Front End:HTML, CSS, Javascript and BootstrapAny IDE like- Netbeans, Eclipse read more

Fore backend:
First, you have to complete core Java with Collection, Multithreading, JDBC and OOPS especially.
Then prepare Advance java (Servlet & JSP) after that Prepare any database like MySQL.
For Front End:
HTML, CSS, Javascript and Bootstrap
Any IDE like- Netbeans, Eclipse

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The only thing is to build several projects which will give you a deep understanding of the various critical underlying concepts, and you will be easily able to crack any related interviews. Continuous practice is a must.
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I can train you online.
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