# Can be used in one category to another category of Public variables! Give one small example : Test00 located in the same package with Test0 Test00 : Import javax.swing.*; Public class (JFrame extends Test00         Test0 test0; Public Test00 () ( Test0 test0 = new (); //test0.i JOptionPane.showMessageDialog (null. String.valueOf (test0.i)); [color=red]------->; why not here i values [/color]     }     Public static void mian () ( Test00 test00 = new Test00 (); Test00.setSize (200, 300); Test00.show (); Test00.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);     } } Test0 : Public class (Test0 Public int i; Public Test0 () ( I = 1;     } } Gloomy! Expert guidance! Em14 : : # Can be used in one category to another category of Public variables! Have Exception? This procedure is very good in the operation of the machine. # Can be used in one category to another category of Public variables! I could not do in the loom above ah! Is the Japanese version of the sdk Do not know what kind of abnormal! Gloomy try # Can be used in one category to another category of Public variables! Sakulagi : I was able to conduct this operation : test0.i= test0.i +163;? # Can be used in one category to another category of Public variables! Public static void mian () This should : Public static void main (String[] args[]) [ Closed window ]