Question 1: What is the difference between an Interface and an Abstract class? Answer:An abstract class can have instance methods that implement a default behavior.An Interface can only declare constants and instance methods, but cannot implement default behavior and all methods are implicitly abstract. An interface has all public members and no implementation. An abstract class is a class which may have the usual flavors of class members (private, protected, etc.), but has some abstract [...]

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Java Interview Questions * Q1. How could Java classes direct program messages to the system console, but error messages, say to a file? A. The class System has a variable out that represents the standard output, and the variable err that represents the standard error device. By default, they both point at the system console. This how the standard output could be re-directed: Stream st = new Stream(new FileOutputStream(“output.txt”)); System.setErr(st); System.setOut(st); * Q2. What’s the [...]