Java Foundations Exam 1Z0-811 Practice Test 5

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5 Questions

What data type should be used for the variable newFee to enable the Course class to compile?

double newFee;

What is the value of newFee if the code compiles and runs successfully?

$5000.00

Which data type has a higher precision in Java?

double

What happens if the variable percentage is declared as double instead of float?

There will be no impact on the result.

Which of the following statements about floating-point numbers in Java is true?

-1.0*Double.POSITIVE_INFINITY results in -Infinity.

Study Notes

Data Type for newFee

  • The variable newFee should be declared as a double to enable the Course class to compile.

Value of newFee

  • The value of newFee depends on the calculation and values used in the code, but if the code compiles and runs successfully, it will hold a decimal value.

Precision in Java

  • double data type has a higher precision than float in Java.

Declaring percentage as double

  • If the variable percentage is declared as double instead of float, it will be able to hold more precise decimal values and reduce the risk of precision loss.

Floating-point Numbers in Java

  • In Java, floating-point numbers are represented as binary fractions, which can lead to slight precision errors due to the conversion from decimal to binary.

Test your knowledge with this practice set for the Java Foundations Exam 1Z0-811. There are 65 questions to answer within a limited time. Get your final score and see how well you performed.

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