Java – can there be any hint that I object to type Equals (incompatible type)?

Is there any tool to remind me not to use the following code:

if ( someClass.equals( someString ))

For example:

if ( myObject.getClass().equals( myClassName ))

Such a thing is legal Java (equal to taking an object), but it will never be evaluated as true (a class will never be equal to a string), so it is almost certainly an error

I've checked eclipse, findbugs and PMD, but it doesn't seem to support this function?

Solution

Yes, IntelliJ idea has such a check. I believe it is enabled by default It is marked as follows:

Class<?> clazz = String.class;
if (clazz.equals("foo")) {
   //...
}

Warning:

You can enable / disable checking by setting – > project settings – > checking, and then check / uncheck the equal sign () between objects of non convertible type under suspicious errors

Findbugs should also use "EC: call to equals() comparing different types" error checking It can integrate with eclipse because it's what you know

Not a silver bullet; They can't understand your mind What you want most is that it will prefer false masks to false negatives