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package _class; import _interfaces.*; public class InterfaceDemoImpl implements InterfaceDemo{ public void testA(){ System.out.println("testA()"); } public String testB(){ return "testB()"; } public static void main(String [] args){ InterfaceDemoImpl i=new InterfaceDemoImpl(); i.testA(); System.out.println(i.testB()); //InterfaceDemoImpl.a=10000; //以上註解拿掉就會過不了 } }