世界上并没有完美的程序，但是我们并不因此而沮丧，因为写程序就是一个不断追求完美的过程。
意图 提供一个创建一系列相关或有依赖关系的对象的接口，而不用指定具体的类。类图 实例 interface Factory { Type1 getType1(String type1); Type2 getType2(String type2); } abstract class AbstractFactory implements Factory { @Override public Type1 getType1(String type1) { throw new UnsupportedOperationException(); } @Override public Type2 getType2(String type2) { throw new UnsupportedOperationException(); } } class Type1Factory extends AbstractFactory { @Override public Type1 getType1(String type1) { Type1 type11 = null; switch (type1) { case "impl1": type11 = new Type1Impl1(); break; case "impl2": type11 = new Type1Impl2(); break; case "impl3": type11 = new Type1Impl3(); break; } return type11; } } class Type2Factory extends AbstractFactory { @Override public Type2 getType2(String type2) { Type2 type21 = null; switch (type2) { case "impl1": type21 = new Type2Impl1(); break; case "impl2": type21 = new Type2Impl2(); break; case "impl3": type21 = new Type2Impl3(); break; } return type21; } } interface Type1 { } class Type1Impl1 implements Type1 {} class Type1Impl2 implements Type1 {} class Type1Impl3 implements Type1 {} interface Type2 { } class Type2Impl1 implements Type2 {} class Type2Impl2 implements Type2 {} class Type2Impl3 implements Type2 {} class FactoryImpl implements Factory { private Type1Factory type1Factory; private Type2Factory type2Factory; public FactoryImpl () { type1Factory = new Type1Factory(); type2Factory = new Type2Factory(); } @Override public Type1 getType1(String type1) { return type1Factory.getType1(type1); } @Override public Type2 getType2(String type2) { return type2Factory.getType2(type2); } } 测试 class FactoryTest { public static void main(String[] args) { Factory factory = new FactoryImpl(); System.out.println(factory.getType1("impl1")); System.out.println(factory.getType1("impl2")); System.out.println(factory.getType1("impl3")); System.out.println(); System.out.println(factory.getType2("impl1")); System.out.println(factory.getType2("impl2")); System.out.println(factory.getType2("impl3")); } }运行结果：
designpattern.abstractfactory.Type1Impl1@6adca536 designpattern.abstractfactory.Type1Impl2@28f67ac7 designpattern.abstractfactory.Type1Impl3@2a18f23c designpattern.abstractfactory.Type2Impl1@23223dd8 designpattern.abstractfactory.Type2Impl2@1b40d5f0 designpattern.abstractfactory.Type2Impl3@3c5a99da