Download Upgrade to Java SE 8 OCP.1z0-813.PrepAway.2019-01-16.30q.tqb

Vendor: Oracle
Exam Code: 1z0-813
Exam Name: Upgrade to Java SE 8 OCP
Date: Jan 16, 2019
File Size: 2 MB
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Demo Questions

Question 1
Given the code fragment:
  
What is the result? 
  1. invalid
  2. An exception is thrown at runtime. 
  3. NULL
  4. Compilation fails. 
  5. blank
Correct answer: B
Explanation:
A java.lang.NullPointerException is through at line switch(str) {. 
A java.lang.NullPointerException is through at line switch(str) {. 
Question 2
Given:
  
Which result is possible? 
  1. Compilation fails.
  2. L1 L2 L3
  3. L2 L3
  4. L1 L3 
  5. L3
Correct answer: B
Explanation:
The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread. The class must define a method of no arguments called run. This interface is designed to provide a common protocol for objects that wish to execute code while they are active. Reference: http://docs.oracle.com/javase/7/docs/api/java/lang/Runnable.html
The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread. The class must define a method of no arguments called run. 
This interface is designed to provide a common protocol for objects that wish to execute code while they are active. 
Reference: http://docs.oracle.com/javase/7/docs/api/java/lang/Runnable.html
Question 3
Given the code fragment:
  
What is the result?
  1. [x, x] 
    [x, x, x, x]
  2. [x, x]
  3. [x] 
    [x, x] 
    [x, x, x]
  4. [x] 
    [x, x] 
    [x, x, x] 
    [x, x, x, x]
Correct answer: D
Explanation:
CyclicBarrier is a synchronization aid that allows a set of threads to all wait for each other to reach a common barrier point. CyclicBarriers are useful in programs involving a fixed sized party of threads that must occasionally wait for each other. The barrier is called cyclic because it can be re-used after the waiting threads are released. Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/CyclicBarrier.html
CyclicBarrier is a synchronization aid that allows a set of threads to all wait for each other to reach a common barrier point. CyclicBarriers are useful in programs involving a fixed sized party of threads that must occasionally wait for each other. The barrier is called cyclic because it can be re-used after the waiting threads are released. 
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/CyclicBarrier.html
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