[LD] Java - Fun Facts - String Equality | Let's Developer With

I thought I know how Strings and == behave. I was wrong...

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[inventitech]

Hi Sven,

The reason for this behaviour is that in all the cases where the assertion works javac is able to statically compute the contents of the string. Hence, the same reference from the string pool can be used. If you look into the byte code, you'll see that there is never a call to NEW java/lang/String. In fact, even a statement like "ab" + "c" is resolved to LDC "abc". If you explicitly invoke the constructor of String, the comparison will fail: assertTrue("abc" == new String("abc")); String interning works on a per-JVM basis, not per class basis (otherwise it would be quite useless).

HTH
Moritz