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Commit 2a4daaa

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author
deeper
committed
add state mode
1 parent e83e9dc commit 2a4daaa

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6 files changed

+121
-3
lines changed

6 files changed

+121
-3
lines changed

‎src/com/ruoxu/pattern/state/Demo.java

Lines changed: 16 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -5,9 +5,22 @@
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* 策略模式的行为是彼此独立,可相互替换的。
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* 状态模式的行为是平行,不可替换的。
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*
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*
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*
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* 使用场景:
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* 一个对象的行为取决于它的状态,并且它必须在运行时根据状态改变它的行为。
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* 代码中有大量if-else或者switch,且这些分支依赖于该对象的状态
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*/
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public class Demo {
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public static void main(String[] args) {
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TvController tvController = new TvController();
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tvController.powerOn();
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tvController.prevChannel();
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tvController.nextChannel();
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tvController.turnUp();
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tvController.turnDown();
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tvController.powerOff();
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tvController.prevChannel();
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tvController.nextChannel();
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}
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}
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package com.ruoxu.pattern.state;
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public interface PowerController {
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void powerOn();
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void powerOff();
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}
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package com.ruoxu.pattern.state;
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/**
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* 关机状态,什么都不做
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*/
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public class PowerOffState implements TvState{
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@Override
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public void prevChannel() {
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// nothing to do
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}
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@Override
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public void nextChannel() {
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// nothing to do
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}
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@Override
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public void turnUp() {
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// nothing to do
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}
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@Override
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public void turnDown() {
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// nothing to do
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}
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}
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package com.ruoxu.pattern.state;
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/**
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* 开机状态
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*/
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public class PowerOnState implements TvState{
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@Override
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public void prevChannel() {
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System.out.println("上一频道");
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}
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@Override
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public void nextChannel() {
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System.out.println("下一频道");
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}
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@Override
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public void turnUp() {
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System.out.println("调高音量");
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}
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@Override
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public void turnDown() {
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System.out.println("调低音量");
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}
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}
Lines changed: 37 additions & 0 deletions
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package com.ruoxu.pattern.state;
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public class TvController implements PowerController{
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private TvState mTvState;
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@Override
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public void powerOn() {
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setTvState(new PowerOnState());
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System.out.println("==== 开机了 ====");
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}
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@Override
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public void powerOff() {
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setTvState(new PowerOffState());
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System.out.println("==== 关机了 ====");
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}
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public void prevChannel() {
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mTvState.prevChannel();
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}
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public void nextChannel() {
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mTvState.nextChannel();
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}
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public void turnUp() {
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mTvState.turnUp();
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}
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public void turnDown() {
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mTvState.turnDown();
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}
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private void setTvState(TvState tvState){
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this.mTvState = tvState;
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}
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}
Lines changed: 8 additions & 0 deletions
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package com.ruoxu.pattern.state;
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public interface TvState {
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void prevChannel();// 上一频道
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void nextChannel();// 下一频道
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void turnUp();// 调高音量
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void turnDown();// 调低音量
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}

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