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Why when i use this:
int a = 1;
methodWithParamString(a + "");
a is cast to String, bu i can’t use toString() on integer?
int a = 1;
methodWithParamString(a.toString());
Doesn’t this: a+"" works like: a.toString() + "" ?
No, it works like
String.valueOf( a ) + "", which in turn behaves likenew StringBuilder( String.valueOf( a ) ).append( "" ).toString().The important thing to know is that it’s all just done by the compiler, in other words it’s syntactic sugar. This is why adding strings together in a loop isn’t a good idea for example. (Although modern VMs might have some mechanism to reduce the performance overhead.)