Oracle 1Z0-815 Online Practice Questions and Exam Preparation

Oracle 1Z0-815 Online Questions & Answers

• Question 21:

  Given:

  

  What is the result?

  A. is it 1
  B. An IndexOutOfBoundsException is thrown at runtime.
  C. is it 0
  D. this is it 2
  E. this is it 3
  D. this is it 2

  ---

  

• Question 22:

  Given:

  

  Which two lines cause compilation errors? (Choose two.)

  A. line 12
  B. line 6
  C. line 9
  D. line 8
  E. line 7
  A. line 12
  E. line 7

• Question 23:

  Given: Which would cause s to be AQCD?

  

  A. s.replace(s.indexOf("A"), s.indexOf("C"), "Q");
  B. s.replace(s.indexOf("B"), s.indexOf("C"), "Q");
  C. s.replace(s.indexOf("B"), s.indexOf("B"), "Q");
  D. s.replace(s.indexOf("A"), s.indexOf("B"), "Q");
  C. s.replace(s.indexOf("B"), s.indexOf("B"), "Q");

• Question 24:

  Which two describe reasons to modularize the JDK? (Choose two.)

  A. easier to understand the Java language
  B. improves security and maintainability
  C. easier to expose implementation details
  D. improves application robustness
  E. easier to build a custom runtime linking application modules and JDK modules
  B. improves security and maintainability
  D. improves application robustness

• Question 25:

  Which is the correct order of possible statements in the structure of a Java class file?

  A. class, package, import
  B. package, import, class
  C. import, package, class
  D. package, class, import
  E. import, class, package
  D. package, class, import

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  Reference: https://www.studytonight.com/java/package-in-java.php

• Question 26:

  Given:

  

  executed using command: java Hello "Hello World" Hello World What is the output?

  A. An exception is thrown at runtime.
  B. Hello WorldHello World
  C. Hello World Hello World
  D. Hello WorldHelloWorld
  E. HelloHello WorldHelloWorld
  C. Hello World Hello World

• Question 27:

  Given the code fragment:

  

  Which "for" loop produces the same output?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  A. Option A

• Question 28:

  Given: What must be added in line 1 to compile this class?

  

  A. catch(IOException e) { }
  B. catch(FileNotFoundException | IndexOutOfBoundsException e) { }
  C. catch(FileNotFoundException | IOException e) { }
  D. catch(IndexOutOfBoundsException e) { } catch(FileNotFoundException e) { }
  E. catch(FileNotFoundException e) { } catch(IndexOutOfBoundsException e) { }
  C. catch(FileNotFoundException | IOException e) { }

• Question 29:

  Given:

  

  Why does D cause a compilation error?

  A. D inherits a() only from C.
  B. D inherits a() from B and C but the return types are incompatible.
  C. D extends more than one interface.
  D. D does not define any method.
  D. D does not define any method.

• Question 30:

  Given:

  

  Which two lines can replace line 1 so that the Y class compiles? (Choose two.)

  A. map.forEach((k, v) -> set(v)));
  B. set(map.values());
  C. super.set(List map)
  D. super.set(map.values());
  E. set(map)
  B. set(map.values());
  D. super.set(map.values());