java幾種簡單的設計模式

單例設計模式

//單例public class Student {    private Student(){}    private static Student instance = new Student();    public Student getInstance() {        return instance;    }}

組合設計模式

//組合public class Coder {    private Computer com;    public Coder(Computer com) {        this.com = com;    }}public class Computer {}

模版方法設計模式

public class Test {    /**     *模板方法     */    public static void main(String[] args) {        AbstractPrinter printer = new MyPrinter();        printer.run();    }}abstract class AbstractPrinter {    public final void run() {            open();        close();    }    abstract void open();    abstract void close();}class MyPrinter extends AbstractPrinter{    @Override    void close() {        System.out.println("close");    }    @Override    void open() {        System.out.println("open");    }    }

裝飾設計模式

public class Test {    /**     * @param args     */    public static void main(String[] args) {        Man man = new Man();        SuperMan sm = new SuperMan(man);        sm.eat();    }}class Man {    public void eat() {        System.out.println("eating!!!!");    }        public void run() {        System.out.println("running!!!!");    }}class SuperMan {    private Man man;    public SuperMan(Man man) {        this.man = man;    }        public void eat() {        System.out.println("lai yi bei");        man.eat();        System.out.println("lai yi gen");    }        public void run() {        man.run();    }        public void fly() {        System.out.println("fly");    }}