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Share some Java and Middleware 1Z0-808 exam questions and answers below.
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 statement is true about the switch statement?
A. It must contain the default section.
B. The break statement, at the end of each case block, is mandatory.
C. Its case label literals can be changed at runtime.
D. Its expression must evaluate to a single value.
Answer: 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
What is the name of the Java concept that uses access modifiers to protect variables and hide them within a class?
A. Encapsulation
B. Inheritance
C. Abstraction
D. Instantiation
E. Polymorphism
Answer: A
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 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
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