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Free 1z0-819: Java SE 11 Developer Exam Questions and Answers
Last updated: January 14, 2025
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340-1z0-819: Java SE 11 Developer
#Question
How would you declare a constant in Java?
A.None of the above
B.Both A and B
C.static final int CONSTANT_VALUE = 10;
D.final int CONSTANT_VALUE = 10;
Correct Answer:
B
Both options A and B are valid ways to declare a constant in Java.
#Question
Which of the following is a valid synchronized method?
A.None of the above
B.Both A and B
C.private synchronized void doTask() {}
D.public synchronized void doTask() {}
Correct Answer:
B
Both public and private synchronized methods are valid in Java; synchronization restricts access to code by multiple threads.
#Question
Which of the following represents a valid Java lambda expression?
A.Both A and B
B.() -> x + y
C.(int x, int y) -> x + y
D.(x, y) -> x + y
Correct Answer:
A
Both A and B are valid lambda expressions, while C is invalid due to incorrect syntax.
#Question
Which of the following is the correct syntax for a constructor in Java?
A.class className()
B.void className()
C.int className()
D.className()
Correct Answer:
D
The correct syntax for declaring a constructor is the same as the class name followed by parentheses.
#Question
Which of the following is not a valid way to create a Java array?
A.double[] arr = new double[10];
B.int arr = new int[];
C.int[] arr = {1, 2};
D.int arr[] = new int[5];
Correct Answer:
B
An array cannot be declared without specifying its size or initialization values.
#Question
How do you create a thread by implementing the Runnable interface?
A.None of the above
B.Both A and B
C.Extend the Thread class
D.Implement the method run
Correct Answer:
B
You can create a thread by either implementing the Runnable interface or extending the Thread class.
#Question
Which of the following is true about Collections in Java?
A.It has non-generic types
B.It allows duplicates
C.It cannot store null
D.It is synchronized by default
Correct Answer:
B
Java Collections allow for duplicate entries in many types of collections such as List.
340-1z0-819: Java SE 11 Developer
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