Java obtains the display screen size

Dimension screensize = toolkit. getdefatooltoolkit (). getscreensize (); int width = (INT) screensize. getwidth (); int Height = (INT) screensize. getheight (); // the physical size of the screen. You also need to know the DPI of the screen, which means how many 1 inch pixels int DPI = toolkit. getdefatooltoolkit (). getscreenresolution (); // The number of inches that can be obtained by dividing the pixel by DPI. If you don't know how to convert the inch to the centimeter, I don't know how to help.