我要评论单例模式根据实例化对象时机的不同分为两种：一种是饿汉式单例，一种是懒汉式单例。
私有的构造方法
指向自己实例的私有静态引用
以自己实例为返回值的静态的公有的方法
饿汉式单例
public class singleton {
private static singleton singleton = new singleton();
private singleton(){}
public static singleton getinstance(){
return singleton;
}
}
懒汉式单例
public class singleton {
private static singleton singleton;
private singleton(){}
public static synchronized singleton getinstance(){
if(singleton==null){
singleton = new singleton();
}
return singleton;
}
}
工厂方法模式代码
interface iproduct {
public void productmethod();
}
class product implements iproduct {
public void productmethod() {
system.out.println("产品");
}
}
interface ifactory {
public iproduct createproduct();
}
class factory implements ifactory {
public iproduct createproduct() {
return new product();
}
}
public class client {
public static void main(string[] args) {
ifactory factory = new factory();
iproduct prodect = factory.createproduct();
prodect.productmethod();
}
}
抽象工厂模式代码
interface iproduct1 {
public void show();
}
interface iproduct2 {
public void show();
}
class product1 implements iproduct1 {
public void show() {
system.out.println("这是1型产品");
}
}
class product2 implements iproduct2 {
public void show() {
system.out.println("这是2型产品");
}
}
interface ifactory {
public iproduct1 createproduct1();
public iproduct2 createproduct2();
}
class factory implements ifactory{
public iproduct1 createproduct1() {
return new product1();
}
public iproduct2 createproduct2() {
return new product2();
}
}
public class client {
public static void main(string[] args){
ifactory factory = new factory();
factory.createproduct1().show();
factory.createproduct2().show();
}
}
希望本文对各位朋友有所帮助
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