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Learn some Java and Middleware 1Z0-808 exam questions and answers below.
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
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 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 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
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