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Java / Instance Variables (Non Static Variables)

1. Define Instance variables. 2. How the object references are initialized when it is a instance variable? 3. Is Instance variables thread safe in Java?

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1. Define Instance variables.

Posted on Apr 1, 2016 by Senthil Kumar.

Instance variables are variables that are defined at the class level. Instance variables need not have to be initialized since they are automatically initialized to its default value during object creation.

2. How the object references are initialized when it is a instance variable?

Object references are initialized to null in case of instance variables.

3. Is Instance variables thread safe in Java?

No.

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OOPS Concepts and its implementation in Java 18 Inheritance 29 Java Identifiers 4 JDK, JRE, JVM, JIT 69 Object, Class and Package 44 Variable 9 Class Variables (Static Variables) 13 Local Variables 6 Instance Variables (Non Static Variables) 3 Operators 9 Package 10 Methods 39 Data types 10 Modifiers 29 Access Modifiers 5 Control Statements 14 Constructor 38 Interface 46 Abstract Class 19 Enum 20 Arrays 20 Strings 32 Using String 29 Exception 55 Collections 56 List and its implementations 22 Set and its implementations 23 Map and its implementations 39 Queue and its implementations 4 Regular expressions 3 Design Patterns 75 Generics 20 Casting 5 volatile 13 Java ThreadLocal 10 Java Multithreading 113 Java Multithreading part II 18 final keyword 13 static keyword 16 Java Transactions (JTA) 21 Concurrent collections 55 Java Serialization 36 JDBC 53 JNDI 17 RMI 6 JAXB 10 Servlet Interview Questions 16 JMS 45 JMX 9 log4j 18 Annotations 10 XML 14 Garbage collection 31 Programs 8 JVM 4 Java8 streams 32 JavaFX 6 Autosys Interview questions 21 The Java Virtual Machine: How and What Is It Used For? Java 11 10 Java 12 5 Top Errors You Should Avoid when Studying Programming Java 17 1

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