Java Foundations

Here you have the best Oracle 1z0-811 practice exam questions

You have 58 total questions to study from
Each page has 5 questions, making a total of 12 pages
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This questions were last updated on December 12, 2024

Question 1 of 58

Which statement is true about primitive variables?

They can be compared with the == operator.

They can be compared with the equals method only.

They cannot be compared.

They can be compared with the compareTo method only.

Correct Answer: A

Primitive variables can be compared using the == operator. This is because the == operator checks for value equality, which is applicable to primitive data types. The equals method and compareTo method are used for objects, not primitives, which makes them unsuitable for primitive comparison.

Question 2 of 58

Given the code fragment:

What is the result?

The program executes an infinite number of times.

Correct Answer: B

The code initializes a boolean variable 'checkOut' to true and an integer variable 'days' to 0. It then enters a while loop that continues as long as 'checkOut' is true. Inside the loop, 'days' is incremented by 1 on each iteration. When 'days' becomes greater than 3, 'checkOut' is set to false, ending the loop. At this point, 'days' is 4, so 'System.out.print(days);' will output 4.

Question 3 of 58

Identify two Java reserved words.

array

true

this

exception

string

Correct Answer: B, C

Java reserved words are keywords that are reserved by the language and cannot be used as identifiers (names) for variables, methods, classes, or other user-defined entities. 'true' is a reserved word in Java as it is a boolean literal. 'this' is also a reserved word in Java as it is used to refer to the current object instance. Therefore, the correct answers are 'true' and 'this'.

Question 4 of 58

Which statement is true about a Java method?

It must be declared with an access modifier.

It cannot be defined within another method.

It must accept a parameter and return a value.

It cannot be defined as static final.

Correct Answer: B

A Java method cannot be defined within another method. Methods are defined within a class, but not inside each other. This is a fundamental aspect of the structure of Java code. Therefore, the statement that a Java method cannot be defined within another method is true.

Question 5 of 58

Given:

And the code fragment:

Which code fragment can be inserted at line n1 to enable the code to print All the best?

void writeMsg();

Messenger.writeMsg();

writeMsg();

m.writeMsg();

Correct Answer: C

To enable the code to print 'All the best,' the method 'writeMsg()' should be called within the 'readMsg()' method. In Java, methods within the same class can be directly invoked using their names. Since 'writeMsg()' is an instance method and not a static method, calling 'writeMsg()' directly within 'readMsg()' is the correct approach. Therefore, the correct code fragment to be inserted at line n1 is 'writeMsg();'.