Oracle 1Z0-819 Online Practice Questions and Exam Preparation

Oracle 1Z0-819 Online Questions & Answers

• Question 311:

  Given:

  

  You want to calculate the average of the Player's score. Which statement inserted on line 1 will accomplish this?

  A. players.stream().average().orElse(0.0);
  B. players.stream().mapToInt(a -> a.score).average().orElse(0.0);
  C. players.stream().mapToDouble(a -> a.score).average();
  D. players.stream().map(a -> a.score).average();
  B. players.stream().mapToInt(a -> a.score).average().orElse(0.0);

• Question 312:

  Given:

  

  and

  

  What is the result?

  A. ADBC
  B. ACB
  C. ACBD
  D. ACD
  E. ACDB
  C. ACBD

• Question 313:

  Given:

  

  What is the result?

  A. Take extra care
  B. The program prints nothing.
  C. Take extra care
  D. An exception is thrown at runtime
  D. An exception is thrown at runtime

• Question 314:

  Which two interfaces are considered to be functional interfaces? (Choose two.)

  A. @FunctionalInterface interface InterfaceC { public boolean equals(Object o); int breed(int x); int calculate(int x, int y); }
  F. @FunctionalInterface interface InterfaceD { int breed(int x); }
  G. @FunctionalInterface interface InterfaceE { public boolean equals(int i); int breed(int x); }
  H. interface InterfaceA { int GERM = 13; public default int getGERM() { return GERM; } }
  I. interface InterfaceB { int GERM = 13; public default int getGERM() { return get(); } private int get() { return GERM; } public boolean equals(Object o); int breed(int x); }
  BE

• Question 315:

  Which is a proper JDBC URL?

  A. jdbe.mysql.com://localhost:3306/database
  B. http://localhost.mysql.com:3306/database
  C. http://localhost mysql.jdbc:3306/database
  D. jdbc:mysql://localhost:3306/database
  D. jdbc:mysql://localhost:3306/database

• Question 316:

  Given:

  

  Which one is correct?

  A. An IllegalThreadStateException is thrown at run time.
  B. Three threads are created.
  C. The compilation fails.
  D. Four threads are created.
  A. An IllegalThreadStateException is thrown at run time.

• Question 317:

  Which describes a characteristic of setting up the Java development environment?

  A. Setting up the Java development environment requires that you also install the JRE.
  B. The Java development environment is set up for all operating systems by default.
  C. You set up the Java development environment for a specific operating system when you install the JDK.
  D. Setting up the Java development environment occurs when you install an IDE before the JDK.
  D. Setting up the Java development environment occurs when you install an IDE before the JDK.

• Question 318:

  Given:

  

  and

  

  Which code fragment on line 1 makes the s1 set contain the names of all employees born before January 1, 1989?

  

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

• Question 319:

  Given:

  

  and the code fragment:

  Which two Map objects group all employees with a salary greater than 30 by neighborhood? (Choose two.)

  

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

• Question 320:

  Which set of commands is necessary to create and run a custom runtime image from Java source files?

  A. java, jdeps
  B. javac, jlink
  C. jar, jlink
  D. javac, jar
  B. javac, jlink