🔰 Java final Variable : In Java, we can use final keyword with variables, methods, and classes. When the final keyword is used with a variable of primitive data types such as int, float, etc, the value of the variable cannot be changed.
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🔰 Can we inherit final method : Yes, final method is inherited but you cannot override it.
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🔰 Java Nested Classes : In Java, it is possible to define a class within another class, such classes are known as nested classes.
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🔰 Member inner class : A non-static class that is created inside a class but outside a method is called member inner class. It is also known as a regular inner class.
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🔰 Local Inner class : A method-local inner class can be instantiated only within the method where the inner class is defined.
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🔰 Static nested class : A static class is a class that is created inside a class, is called a static nested class in Java. It cannot access non-static data members and methods.
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🔰 Java Nested Interface : We can declare interfaces as members of a class or another interface. Such an interface is called a member interface or nested interface.
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🔰 What is API document in Java?
JavaDoc tool is a document generator tool in Java programming language for generating standard documentation in HTML format.
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🔰 What is multithreading in Java?
Multithreading is a Java feature that allows concurrent execution of two or more parts of a program for maximum utilization of CPU.
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🔰 What is thread life cycle in Java?
Java Life cycle of a thread or thread life cycle in java explains the five states new, runnable, running, blocked and dead.
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🔰 What is a Thread in Java?
A thread is a light-weight process in Java. It's a path of execution within a process.
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What is thread sleep method in Java?
The Java Thread. sleep() method can be used to pause the execution of the current thread for a specified time in milliseconds. The argument value for milliseconds cannot be negative. Otherwise, it throws IllegalArgumentException.…

🔰 Java Shutdown Hook : Shutdown Hooks are a special construct that allows developers to plug in a piece of code to be executed when the JVM is shutting down.
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🔰 What is ThreadGroups in Java?
A ThreadGroup represents a set of threads. A thread group can also include the other thread group. The thread group creates a tree in which every thread group except the initial thread group has a parent.
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🔰 Can we start a thread twice?
No. After starting a thread, it can never be started again. If you does so, an IllegalThreadStateException is thrown. In such case, thread will run once but for second time, it will throw exception.
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🔰 Can we call run method directly in Java?
Yes, we can call run method directly. Only difference is that when start method is called it creates a separate call stack for that thread but in case when run method is called directly from main method it will not…

🔰 Join Method in Java : Join method in Java allows one thread to wait until another thread completes its execution.

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