Oracle 1z0-808 Questions Answers

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Oracle 1z0-808 Sample Questions

Question # 1

Which two code fragments cause a compilation error? (Choose two.)

A. float flt = 100.00F;
B. float flt = (float) 1_11.00;
C. Float flt = 100.00;
D. double y1 = 203.22;float flt = y1;
E. int y2 = 100;float flt = (float) y2 ;

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Question # 2

Which two code fragments cause compilation errors? (Choose two.)

A. double y1 = 203.22; float fit = y1;
B. float fit = (float) 1_11.00;
C. Float fit = 100.00;
D. int y2 = 100;float fit = (float) y2;
E. float fit = 100.00F;

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Question # 3

Which three statements are true about the structure of a Java class? (Choose three.)

A. A class cannot have the same name as its field.
B. A public class must have a main method.
C. A class can have final static methods.
D. A class can have overloaded private constructors.
E. Fields need to be initialized before use.
F. Methods and fields are optional components of a class.

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Question # 4

Which three statements are true about exception handling? (Choose three.)

A. Only unchecked exceptions can be rethrown.
B. All subclasses of the RuntimeException class are not 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 RuntimeException class are unchecked exceptions.
F. All subclasses of the Error class are not recoverable.

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Question # 5

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.

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Question # 6

What is the name of the Java concept that uses access modifiers to protect variables andhide them within a class?

A. Encapsulation
B. Inheritance
C. Abstraction
D. Instantiation
E. Polymorphism

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Question # 7

Which two initialization statements are valid? (Choose two.)

A. Boolean available = “TRUE”:
B. String tmpAuthor = author, author =”Mc Donald”;
C. Double price = 200D;
D. Integer pages = 20;

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Question # 8

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 Environmentand a Java compiler.

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Question # 9

Which two statements are true about Java byte code? (Choose two.)

A. It can be serialized across network.
B. It can run on any platform that has a Java compiler.
C. It can run on any platform.
D. It has “.java” extension.
E. It can run on any platform that has the Java Runtime Environment.

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Question # 10

Which two statements are true? (Choose two.)

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.

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Question # 11

Which three are advantages of the Java exception mechanism? (Choose three.)

A. Improves the program structure because the error handling code is separated from thenormal program function
B. Provides a set of standard exceptions that covers all possible errors
C. Improves the program structure because the programmer can choose where to handleexceptions
D. Improves the program structure because exceptions must be handled in the method inwhich they occurred
E. Allows the creation of new exceptions that are customized to the particular programbeing created

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Question # 12

Which is true about the switch statement?

A. Its expression can evaluate to a collection of values.
B. The break statement, at the end of each case block, is optional.
C. Its case label literals can be changed at runtime.
D. It must contain the default section.

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Question # 13

Which three statements describe the object-oriented features of the Java language?(Choose three.)

A. Objects cannot be reused.
B. A subclass must override the methods from a superclass.
C. Objects can share behaviors with other objects.
D. A package must contain a main class.
E. Object is the root class of all other objects.
F. A main method must be declared in every class.

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Question # 14

Which statement best describes encapsulation?

A. Encapsulation ensures that classes can be designed so that only certain fields andmethods of an object are accessible from other objects.
B. Encapsulation ensures that classes can be designed so that their methods areinheritable.
C. Encapsulation ensures that classes can be designed with some fields and methodsdeclared as abstract.
D. Encapsulation ensures that classes can be designed so that if a method has anargument MyType x, any subclass of MyType can be passed to that method.

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Question # 15

Which statement is true about the main() method?

A. It is invoked by JRE
B. It is a final method
C. It returns true if it is executed successfully at run time
D. It must be defined within a public class

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