Oracle 1Z0-808 Online Practice Questions and Exam Preparation

Oracle 1Z0-808 Online Questions & Answers

• Question 151:

  Given the code snippet from a compiled Java source file:

  

  Which command-line arguments should you pass to the program to obtain the following output?

  Arg is 2

  A. java MyFile 1 3 2 2
  B. java MyFile 2 2 2
  C. java MyFile 1 2 2 3 4
  D. java MyFile 0 1 2 3
  A. java MyFile 1 3 2 2

• Question 152:

  Given:

  

  What would be the output, if it is executed as a program?

  A. name =, pass =
  B. name = null, pass = null
  C. name = null, pass = false
  D. name = null pass = true
  E. Compile error.
  C. name = null, pass = false

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  Explanation/Reference:

  Both name and pass variables are instance variables, and we haven't given them any values, so they take their default values. For Boolean default value is false and for string which is not a primitive type default is null So at line 7, null will

  printed as the value of the variable name, and at line 8 false will be printed. Hence Option C is correct. As explained above options A, B and D are incorrect.

  Code compiles fine so option E is incorrect.

  Reference:

  https://docs.oracle.com/javaseAutorial/java/javaOOAariables.html

• Question 153:

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

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  Explanation/Reference:

• Question 154:

  Given the code fragment:

  

  What is the result?

  A. A B C Work done
  B. A B C D Work done
  C. A Work done
  D. Compilation fails
  C. A Work done

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  Explanation/Reference:

• Question 155:

  Given the code fragments:

  

  And,

  

  Which statement is true?

  A. After line 11, three objects are eligible for garbage collection.
  B. After line 11, two objects are eligible for garbage collection.
  C. After line 11, one object is eligible for garbage collection.
  D. After line 11, none of the objects are eligible for garbage collection.
  C. After line 11, one object is eligible for garbage collection.

• Question 156:

  Given the code fragment:

  

  What is the result?

  A. EN FR JP
  B. EN FR
  C. CH
  D. EN FR CH
  B. EN FR

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  Explanation/Reference:

  

• Question 157:

  Given:

  

  What is the result?

  A. The sum is 2
  B. The sum is 14
  C. The sum is 15
  D. The loop executes infinite times
  E. Compilation fails
  E. Compilation fails

• Question 158:

  Given:

  

  What is the result?

  A. 10 20 30 40
  B. 0 0 30 40
  C. Compilation fails
  D. An exception is thrown at runtime
  B. 0 0 30 40

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  Explanation/Reference:

• Question 159:

  Given:

  

  What is the result?

  A. true, false
  B. false, true
  C. true, true
  D. false, false
  A. true, false

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  Explanation/Reference:

• Question 160:

  Which usage represents a valid way of compiling java source file with the name "Main"?

  A. javac Main.java
  B. java Main.class
  C. java Main.java
  D. javac Main
  E. java Main
  A. javac Main.java

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  Explanation/Reference:

  The compiler is invoked by the javac command. When compiling a Java class, you must include the file name, which houses the main classes including the Java extension. So to run Main.java file we have to use command in option A. TO execute Java program we can use Java command but can't use it for compiling. https://docs.oracle.com/javase/tutorial/getStarted/application/index.html