Sir tell me some tips to code in java?

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If you know C / C++ already, just try how will you able to achieve same examples in java. I prefer try to understand the fundamental of java and create small programs, then make the connectivity among them. Slowly build an application.
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MCA

Practising the examples is the best to get more knowledge in java. After you get some confidence then you can go for tips.
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AI & Data | Cyber | Data Analytics | BI | Programming

Buy a scjp book by Katty Sierra and do practise every day you will become master one day in java
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B.Tech CS working as Software Engineer in product based company

Go through Balaguruswamy and Oracle Java Specifications.
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Tutor taking Computer subjects Classes

First of all u need to get the concept of java. i.e. Identify the area of interest and the corresponding attributes. this is half way done. then step by step u learn what is constructor, method overloading, inheritance.
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Coaching

Better to start with some core JAVA programming.
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Java/J2EE, B.E./B.Tech/MCA SubjectsTraining

Start programming with basic core java programs with the help of Examples and then move to other tough programs step by step once all concepts of previous program is clear.
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IT Professional Trainer working with a reputed Institute. Headquarters: Hyderabad

Read from a standard book and practice
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Experience in Java and Android Trainer.

Should be sound knowledge in OOPs concept and then practice SCJP example programming.
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Mentor

serialVersionUID is a version control mechanism in a Serializable class. If you do not explicitly declare a serialVersionUID, JVM will do it for you automatically. This ID is used during deserialization to verify that the sender and receiver of a serialized object are compatible with respect to serialization....
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serialVersionUID is a version control mechanism in a Serializable class. If you do not explicitly declare a serialVersionUID, JVM will do it for you automatically. This ID is used during deserialization to verify that the sender and receiver of a serialized object are compatible with respect to serialization. If the receiver has loaded a class for the object that has a different serialVersionUID than that of the corresponding sender's class, then deserialization will result in an InvalidClassException. You can learn more about this here:http://docs.oracle.com/javase/1.5.0/docs/api/java/io/Serializable.html read less
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