状态模式

Folgerjun · web-flow · commit 67c209b7aa98 · 2018-03-12T10:49:34.000+08:00
状态模式
diff --git a/java-des/src/com/java/design/state/Context.java b/java-des/src/com/java/design/state/Context.java
@@ -0,0 +1,25 @@
+package com.java.design.state;
+
+/**
+ * 定义状态
+ * 
+ * @author Administrator
+ *
+ */
+public class Context {
+
+	private State state;
+
+	public State getState() {
+		return state;
+	}
+
+	public void setState(State state) {
+		this.state = state;
+	}
+
+	public String stateMessage() {
+		return state.getState();
+	}
+
+}
diff --git a/java-des/src/com/java/design/state/Rain.java b/java-des/src/com/java/design/state/Rain.java
@@ -0,0 +1,10 @@
+package com.java.design.state;
+
+public class Rain implements State {
+
+	@Override
+	public String getState() {
+
+		return "Rain";
+	}
+}
diff --git a/java-des/src/com/java/design/state/State.java b/java-des/src/com/java/design/state/State.java
@@ -0,0 +1,17 @@
+package com.java.design.state;
+
+/**
+ * 状态接口
+ * 
+ * @author Administrator
+ *
+ */
+public interface State {
+
+	/**
+	 * 获取状态
+	 * 
+	 * @return
+	 */
+	String getState();
+}
diff --git a/java-des/src/com/java/design/state/StatePattern.java b/java-des/src/com/java/design/state/StatePattern.java
@@ -0,0 +1,27 @@
+package com.java.design.state;
+
+/**
+ * 状态模式 ----->
+ * 定义对象间的一种一对多的依赖关系,当一个对象的状态发生改变时,所有依赖于它的对象都得到通知并被自动更新。允许一个对象在其内部状态改变时改变它的行为
+ * 对象看起来似乎修改了它的类
+ * 
+ * @author Administrator
+ *
+ */
+public class StatePattern {
+
+	public static void main(String[] args) {
+
+		Context context = new Context();
+		context.setState(new SunShine());
+		String messageSun = context.stateMessage();
+		System.out.println(messageSun);
+
+		System.out.println("----------------");
+
+		context.setState(new Rain());
+		String messageRain = context.stateMessage();
+		System.out.println(messageRain);
+	}
+
+}
diff --git a/java-des/src/com/java/design/state/SunShine.java b/java-des/src/com/java/design/state/SunShine.java
@@ -0,0 +1,10 @@
+package com.java.design.state;
+
+public class SunShine implements State {
+
+	@Override
+	public String getState() {
+
+		return "SunShine";
+	}
+}
