Is it a Bug of JDK?

Question

JSlider m_Slider = new JSlider();
m_Slider.setMajorTickSpacing( 10 );
m_Slider.setSnapToTicks( true );
when the system use windows lookandfeel,it works properly,but if the system use
MetalLookAndFeel, the last sentense doesn't work,I use jdk1.4.1
is it a bug? how can I get it work properly?

Answer 1

I have sympathy with the OP. It strikes me as
unreasonable that the compiler cannot detect this
obvious bad cast. I guess whoever wrote the compiler made a point about not trying to backtrack the latest write access to a variable to check a cast, just to see whether it is followed by a "new X" and to check whether X is legal for the cast. Unnecessary complication, especially considered that an assignment from another reference or even another cast blow that out of proportion, and totally leads to a dead end if it's the return value of some factory method or worse, Class.forName() call. The compiler will spend 3 seconds compiling and 5 minutes checking the casts.