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Referencing of Instances
class A { // some code here} class B { // some code here}class Ex {public static void main(string args[]) {A a=new B();B b=new A();a.add();b.add();}Will this program run? Explain the referencing the object instances. What is the result;
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If a variable is declared as private, where may the variable be accessed
A private variable may only be accessed within the class in which it is declared.
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Q: What is it reflection (introspection) ? Why is reflection possible in the Java language?
Reflection (introspection) is querying a class about its properties, and operating on methods and fields by the name for a given object instance. Reflection is possible in the Java language because of late binding.
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Immutable Strings Object
How String object is immutable and why?
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How does multithreading take place on a computer with a single CPU
The operating system's task scheduler allocates execution time to multiple tasks. Byquickly switching between executing tasks, it creates the impression that tasks executesequentially.
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Java Reflection
What is reflection and its use in java?
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What value does read() return when it has reached the end of a file
The read() method returns -1 when it has reached the end of a file.
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What is the difference between a Window and a Frame
The Frame class extends Window to define a main application window that can have amenu bar.
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Is the following Java program run? private static void main(String args[]) { class valan { //body of the class } }
No. Compilation error will occur.The error message is : main method should be public
Java Interview Questions
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