Oracle 1Z0-819 Online Practice Questions and Exam Preparation

Oracle 1Z0-819 Online Questions & Answers

• Question 151:

  Given:

  

  Which makes class A thread safe?

  A. Class A is thread safe.
  B. Make foo and setB synchronized.
  C. Make foo synchronized.
  D. Make A synchronized.
  E. Make setB synchronized.
  B. Make foo and setB synchronized.

• Question 152:

  Given:

  

  Which statement is true?

  A. The code prints 10.
  B. The code fails to compile at line n2.
  C. The code fails to compile at line n1.
  D. The code fails to compile at line n4.
  E. The code fails to compile at line n3.
  F. The code prints 100.
  C. The code fails to compile at line n1.

• Question 153:

  Given the code fragment:

  

  Which two statement inserted independently at line 1 enable this code to print PRRT?

  A. i--;
  B. continue b;
  C. break b;
  D. j--;
  E. continue a;
  F. break a ;
  C. break b;
  E. continue a;

• Question 154:

  Given:

  

  Which two are correct? (Choose two.)

  A. The output will be exactly 2 1 3 4 5.
  B. The program prints 1 4 2 3, but the order is unpredictable.
  C. Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5, but the order is unpredictable.
  D. Replacing forEach() with forEachOrdered(), the program prints 1 2 3 4 5.
  E. Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5.
  B. The program prints 1 4 2 3, but the order is unpredictable.
  D. Replacing forEach() with forEachOrdered(), the program prints 1 2 3 4 5.

• Question 155:

  Which two modules include APIs in the Java SE Specification? (Choose two.)

  A. java.logging
  B. java.desktop
  C. javafx
  D. jdk.httpserver
  E. jdk.jartool
  A. java.logging
  D. jdk.httpserver

• Question 156:

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

  A. Modular jars loaded from --module-path are automatic modules.
  B. Any named module can directly access all classes in an automatic module.
  C. Classes found in -classpath are part of an unnamed module.
  D. Modular jars loaded from -classpath are automatic modules.
  E. If a package is defined in both the named module and the unnamed module, then the package in the unnamed module is ignored.
  A. Modular jars loaded from --module-path are automatic modules.
  C. Classes found in -classpath are part of an unnamed module.

• Question 157:

  Given:

  

  executed with this command: java Main one two three What is the result?

  A. 0). one
  B. 0). one1). two2). three
  C. The compilation fails.
  D. It creates an infinite loop printing:0). one1). two1). two...
  E. A java.lang.NullPointerException is thrown.
  D. It creates an infinite loop printing:0). one1). two1). two...

• Question 158:

  Which module defines the foundational APIs of the Java SE Platform?

  A. java.base
  B. java.se
  C. java.lang
  D. java.object
  A. java.base

• Question 159:

  Given: What is the result?

  

  A. 2.0
  B. 1.0
  C. 3.0
  D. The program pints nothing.
  E. An exception is thrown at runtime.
  C. 3.0

• Question 160:

  Your organization makes mlib.jar available to your cloud customers. While working on a new feature for mlib.jar, you see that the customer visible method public void enableService(String hostName, String portNumber) executes this code fragment

  

  and you see this grant is in the security policy file:

  

  What security vulnerability does this expose to your cloud customer's code?

  A. privilege escalation attack against the OS running the customer code
  B. SQL injection attack against the specified host and port
  C. XML injection attack against any mlib server
  D. none because the customer code base must also be granted SocketPermission
  E. denial of service attack against any reachable machine
  E. denial of service attack against any reachable machine