Java 简单工厂设计模式示例：水果类

public class Test { public static void main(String[] args) { Fruit apple = Factory.getInstance('apple'); apple.eat(); // 输出：吃苹果

    Fruit orange = Factory.getInstance('orange');
    orange.eat(); // 输出：吃橘子
}

}

interface Fruit { void eat(); }

class Apple implements Fruit { @Override public void eat() { System.out.println('吃苹果'); } }

class Orange implements Fruit { @Override public void eat() { System.out.println('吃橘子'); } }

class Factory { public static Fruit getInstance(String className) { Fruit f = null; if ('apple'.equals(className)) { f = new Apple(); } if ('orange'.equals(className)) { f = new Orange(); } return f; } }