[Java Silver SE 17] Organizing the differences between classes and instances | A story about stumbling over reference variables

While studying for the Java Silver exam, I learned about "classes and instances" this time.Since this content also appeared ...

Why doesn't 0.1 + 0.2 equal 0.3 in Java? Trying BigDecimal for monetary calculations

I added 0.1 and 0.2 to check if they equal 0.3, but it returned false. The formula should be correct, so why?This is a ...