Download Oracle.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 |
Demo Questions
Question 1
Given the code fragment:
What is the result?
- invalid
- An exception is thrown at runtime.
- NULL
- Compilation fails.
- 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?
- Compilation fails.
- L1 L2 L3
- L2 L3
- L1 L3
- 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?
- [x, x][x, x, x, x]
- [x, x]
- [x][x, x][x, x, x]
- [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
