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What kinds of certifications are available for Java professionals?

Asked by Abhishek 10/03/2016 Last Modified 10/03/2016

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What is Constructor in Java?

A constructor in is a block of code similar to a method that's called when an instance of an object is created.

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public class X { public static void main(String [] args) { X x = new X(); X x2 = m1(x); /* Line 6 */ X x4 = new X(); x2 = x4; /* Line 8 */ doComplexStuff(); } static X m1(X mx) { mx = new X(); return mx; } } After line 8 runs. how many objects are eligible for garbage collection?

Only one. After line 8 the original object referred to by x2 is dereferenced and ready for garbage collection. In m1(), mx ignores the object passed as argument and refers to a new object which is returned.

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How do apprach to an unknown problem to construct its solution? Especially when do you face any programming challenge.

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How does Java implement polymorphism?

Java implements polymorphism in two ways: 1. Static or compile-time polymorphism is done by method overloading (more then one methods sharing the same name but different number/types/order of parameters) 2....

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