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Java / static keyword

Explain illegal forward reference error in static block.

Forward reference error is a Java compile time error that occurs when a variable is referenced before it is declared.

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What is static keyword in Java? can the static keyword be applied on outer class? What is a static variable in Java? The advantage of using static variable. Are static local variables allowed in Java? What is a static block? Can we have multiple static blocks in a Java class? Why can abstract method not be static in Java? What is a static method? What is nested static class in Java? When nested static class is required? Can a static nested class access instance members of enclosing class? Difference between static nested class and inner class. Explain illegal forward reference error in static block. Order of execution of static block, initializer block and constructor during inheritance. How are static variables treated in clustered environment?

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Concurrent collections

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OOPS Concepts and its implementation in Java 18 Inheritance 29 JDK, JRE, JVM, JIT 69 Java Identifiers 4 Object, Class and Package 44 Variable 9 Local Variables 6 Class Variables (Static Variables) 13 Instance Variables (Non Static Variables) 3 Package 10 Operators 9 Data types 10 Methods 38 Modifiers 29 Control Statements 12 Access Modifiers 5 Constructor 38 Interface 46 Abstract Class 19 Enum 20 Arrays 11 Strings 32 Using String 29 Exception 55 Collections 56 List and its implementations 22 Map and its implementations 36 Set and its implementations 23 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 17 final keyword 13 static keyword 16 Concurrent collections 55 Java Serialization 36 JDBC 53 JNDI 17 RMI 6 JAXB 10 JMX 9 log4j 18 Annotations 10 XML 14 Garbage collection 31 Programs 8 JVM 4 Java8 streams 25 JavaFX 6 Autosys 9 The Java Virtual Machine: How and What Is It Used For?

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