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Check all valid methods of creation of an Exception class.
Just declare a new class (which will inherit from Object)
Implement the Throwable interface
Extend the Throwable class
Extend the Catchable class
Extend the Exception class
Explanation
Exceptions must extend the
Throwable
class (which is not an interface). The
Throwable
class is a superclass (parent) of the
Exception
class, hence inheriting from any of them is a valid way of creating an exception class.
exceptions
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What will be the result of the compilation and execution of the following code? 01. class A { 02. public void process() { System.out.print("A,"); } 03. } 04. public class B extends A { 05. public void process() throws IOException { 06. super.process(); 07. System.out.print("B,"); 08. throw new IOException(); 09. } 10. 11. public static void main(String[] args) { 12. try { new B().process(); } 13. catch (IOException e) { System.out.println("Exception"); } 14. } 15. }
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What will be the result of the following code execution? class A { public void process() { System.out.print("A "); } } class B extends A { public void process() throws RuntimeException { super.process(); if (true) throw new RuntimeException(); System.out.print("B "); } public static void main(String[] args) { try { ((A)new B()).process(); } catch (Exception e) { System.out.print("Exception "); } } }
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What will be printed out as a result of the following code execution / compilation? class A { public A() { System.out.print("A"); } } class B { public B() { System.out.print("B"); } } class C { public C() { System.out.print("C"); } } public class D extends C { private A objA = new A(); private static B objB = new B(); public D() { System.out.print("D"); } public static void main(String[] args){ new D(); } }
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