1Z0-811 Java Language Fundamentals 3

Question 1

What is the range of a Java 'byte' data type?

Accepted Answer

-128 to 127

Answer

The byte type is an 8-bit signed integer with a range of -128 to 127.

Question 2

What is the output of the following?

int a = 10;
int b = 3;
System.out.println(a % b);

Accepted Answer

1

Answer

The % operator returns the remainder; 10 divided by 3 is 3 with a remainder of 1.

Question 3

Which statement about 'var' in Java 11 is correct?

Accepted Answer

var can be used for local variable type inference

Answer

In Java 10+, 'var' enables local variable type inference, allowing the compiler to infer the type from the initializer.

Question 4

What happens when you compare two String objects using == in Java?

Accepted Answer

It compares their memory references

Answer

The == operator on objects compares references, not content; use .equals() to compare String content.

Question 5

What is the result of the expression: (int) 9.99?

Accepted Answer

9

Answer

Casting a double to int truncates (not rounds) the decimal part, so (int)9.99 yields 9.

(1Z0-811) Oracle Java SE11 Programmer Practice Test