Oracle certification 1Z0-808 study guide

January 15 [Mon], 2018, 14:25
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Share some Java and Middleware 1Z0-808 exam questions and answers below.
Which statement will empty the contents of a StringBuilder variable named sb?
A. sb. deleteAll ();
B. sb. delete (0, sb. size () );
C. sb. delete (0, sb. length () );
D. sb. removeAll ();
Answer: C

Which three are advantages of the Java exception mechanism?
A. Improves the program structure because the error handling code is separated from the normal program function
B. Provides a set of standard exceptions that covers all the possible errors
C. Improves the program structure because the programmer can choose where to handle exceptions
D. Improves the program structure because exceptions must be handled in the method in which they occurred
E. Allows the creation of new exceptions that are tailored to the particular program being created
Answer: A,C,D

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

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 three statements are true about the structure of a Java class?
A. A public class must have a main method.
B. A class can have only one private constructor.
C. A method can have the same name as a field.
D. A class can have overloaded static methods.
E. The methods are mandatory components of a class.
F. The fields need not be initialized before use.
Answer: A,C,E

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

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