= and == difference in If statement Java

Question

I am facing something strange here. Please help me understand if I am missing something. My if condition was supposed to be:

if(configuredPdf == true)
         


        

Answer 1

An assignment is an expression which returns the value you assigned. e.g. a = b = true will assign true to a and b.

The reason boolean type was added was to avoid this sort of bug. In C for example you can write

if (a = 1)

and anything non-negative is true.

While you can still make a mistake with boolean types, instead of writing

if (a == true)
if (b == false)

you can write

if (a)
if (!b)

A more common example is

for(String line; ((line = br.readLine()) != null;) {
    // process the line.
}