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Share some Java and Middleware 1Z0-808 exam questions and answers below.
Which two are benefits of polymorphism?
A. Faster code at runtime
B. More efficient code at runtime
C. More dynamic code at runtime
D. More flexible and reusable code
E. Code that is protected from extension by other classes
Answer: B,D
Which two statements are true?
A. Error class is unextendable.
B. Error class is extendable.
C. Error is a RuntimeException.
D. Error is an Exception.
E. Error is a Throwable.
Answer: B,C
Which three statements are true about exception handling?
A. Only unchecked exceptions can be rethrown.
B. All subclasses of the RuntimeException class are recoverable.
C. The parameter in a catch block is of Throwable type.
D. All subclasses of the RuntimeException class must be caught or declared to be thrown.
E. All subclasses of the Exception class except the RuntimeException class are checked exceptions.
F. All subclasses of the Error class are checked exceptions and are recoverable.
Answer: C,E,F
Which two class definitions fail to compile?
A. abstract class A3 {private static int i;public void doStuff(){}public A3(){}}
B. final class A1 {public A1(){}}
C. public class A2 {private static int i;private A2(){}}
D. class A4 {protected static final int i;private void doStuff(){}}
E. final abstract class A5 {protected static int i;void doStuff(){}abstract void doIt();}
Answer: C,E
Which statement is true about Java byte code?
A. It can run on any platform.
B. It can run on any platform only if it was compiled for that platform.
C. It can run on any platform that has the Java Runtime Environment.
D. It can run on any platform that has a Java compiler.
E. It can run on any platform only if that platform has both the Java Runtime Environment and a Java compiler.
Answer: D
Which three statements describe the object-oriented features of the Java language?
A. Objects cannot be reused.
B. A subclass can inherit from a superclass.
C. Objects can share behaviors with other objects.
D. A package must contain more than one class.
E. Object is the root class of all other objects.
F. A main method must be declared in every class.
Answer: B,C,F
Which statement best describes encapsulation?
A. Encapsulation ensures that classes can be designed so that only certain fields and methods of an object are accessible from other objects.
B. Encapsulation ensures that classes can be designed so that their methods are inheritable.
C. Encapsulation ensures that classes can be designed with some fields and methods declared as abstract.
D. Encapsulation ensures that classes can be designed so that if a method has an argument MyType x, any subclass of MyType can be passed to that method.
Answer: A
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