摘要：
import java.io.*; public class TestFactory{ public static void main(String[] args){ Animal a = Factory.createAnimal(); } } abstract class Animal{} cla 阅读全文
摘要：
public class TestSingleton{ public static void main(String[] args){ MyClass mc = MyClass.newInstance(); } } class MyClass { private static final MyCla 阅读全文