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 ...
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String comparisons in Java

Java’s String class encapsulates an array of bytes. A byte can be converted to a char, in which case, String becomes an array of characters used to compose words, sentences, or any other data you want ...