Is it wrong to use the == operator when comparing float in Java?

Here java.According to the sun page, == is an equivalent comparison operator for floating point number in Java.

However, write these codes in the editor:

if(sectionID == currentSectionID)

When I run Static analysis, the message "JAVA0078 Floating point values combined with ==" appears.

What is wrong with using the == operator to compare floating point values? What is the right way?

2022-09-22 22:01

1 Answers

This is the correct way to test float for 'equal' :

if(Math.abs(sectionID - currentSectionID) < epsilon)

epsilon is as small as 0.00000001. Depending on the accuracy you want, it can be smaller or larger.

2022-09-22 22:01

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