java memento_java设计模式进阶_memento

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#java memento

// Generated by StarUML(tm) Java Add-In

// @ Project : Untitled

// @ File Name : StarMemento.java

// @ Date : 2016/8/30

// @ Author :

public interface StarMemento {

}

// Generated by StarUML(tm) Java Add-In

// @ Project : Untitled

// @ File Name : StarMementoInternal.java

// @ Date : 2016/8/30

// @ Author :

public class StarMementoInternal implements StarMemento {

private StarType type;

private int ageYears;

private int massTons;

public StarType getType() {

return type;

}

public void setType(StarType type) {

this.type = type;

}

public int getAgeYears() {

return ageYears;

}

public void setAgeYears(int year) {

this.ageYears = year;

}

public int getMassTons() {

return massTons;

}

public void setMassTons(int massTons) {

this.massTons = massTons;

}

// Generated by StarUML(tm) Java Add-In

// @ Project : Untitled

// @ File Name : Star.java

// @ Date : 2016/8/30

// @ Author :

public class Star {

private StarType type;

private int ageYears;

private int massTons;

public Star(StarType type, int startAge, int startMass) {

this.type = type;

this.ageYears = startAge;

this.massTons = startMass;

}

public void timePasses() {

ageYears *= 2;

massTons *= 8;

switch(type)

{

case RED_GIANT:

type = StarType.WHITE_DWARF;

break;

case SUN:

type = StarType.RED_GIANT;

break;

case SUPERNOVA:

type = StarType.DEAD;

break;

case WHITE_DWARF:

type = StarType.SUPERNOVA;

break;

case DEAD:

ageYears *= 2;

massTons = 0;

break;

default:

break;

}

public StarMemento getMemento() {

StarMementoInternal state = new StarMementoInternal();

state.setAgeYears(ageYears);

state.setMassTons(massTons);

state.setType(type);

return state;

}

public void setMemento(StarMemento memento) {

StarMementoInternal state = (StarMementoInternal)memento;

this.type = state.getType();

this.ageYears = state.getAgeYears();

this.massTons = state.getMassTons();

}

public String toString() {

return String.format("%s age: %d years mass: %d tons", type.toString(),ageYears,massTons);

}

public enum StarType {

SUN("sun"),//太阳

RED_GIANT("red giant"),//巨人

WHITE_DWARF("white dwarf"),//白色-矮人

SUPERNOVA("supernova"),//超新星

DEAD("dead star"),//废星

UNDEFINED("")//未命名

;

private String title;

StarType(String title){

this.title = title;

}

public String toString()

{

return title;

}

import java.util.Stack;

public class App {

public static void main(String[] args) {

Stack states = new Stack<>();

Star star = new Star(StarType.SUN,10000000,500000);

System.out.println(star);

states.add(star.getMemento());

star.timePasses();

System.out.println(star);

states.add(star.getMemento());

star.timePasses();

System.out.println(star);

states.add(star.getMemento());

star.timePasses();

System.out.println(star);

states.add(star.getMemento());

star.timePasses();

System.out.println(star);

while(states.size() > 0)

{

star.setMemento(states.pop());

System.out.println(star);

}

/*sun age: 10000000 years mass: 500000 tons red giant age: 20000000 years mass: 4000000 tons white dwarf age: 40000000 years mass: 32000000 tons supernova age: 80000000 years mass: 256000000 tons dead star age: 160000000 years mass: 2048000000 tons supernova age: 80000000 years mass: 256000000 tons white dwarf age: 40000000 years mass: 32000000 tons red giant age: 20000000 years mass: 4000000 tons sun age: 10000000 years mass: 500000 tons */