设计模式

sjms/src/main/java/com/quinn/sjms/explan/AbstractExpression.java

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+package com.quinn.sjms.explan;
+
+/**
+ * 具体的解释任务由各个实现类完成，具体的解释器分别由TerminalExpression和Non- terminalExpression完成
+ */
+public abstract class AbstractExpression {
+
+    abstract Object interpret();
+
+}

sjms/src/main/java/com/quinn/sjms/explan/Context.java

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+package com.quinn.sjms.explan;
+
+public class Context {
+}

sjms/src/main/java/com/quinn/sjms/explan/ExplanClient.java

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+package com.quinn.sjms.explan;
+
+import java.util.Stack;
+
+public class ExplanClient {
+    public static void main(String[] args) {
+        Context ctx = new Context();
+        Stack<AbstractExpression> stack = null;
+        // add some Expression
+
+        AbstractExpression exp = stack.pop();
+        exp.interpret();
+    }
+}

sjms/src/main/java/com/quinn/sjms/explan/NonTerminalExpression.java

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+package com.quinn.sjms.explan;
+
+public class NonTerminalExpression extends AbstractExpression {
+
+    public NonTerminalExpression(AbstractExpression ... expressions) {
+    }
+
+    @Override
+    public Object interpret() {
+        return null;
+    }
+}

sjms/src/main/java/com/quinn/sjms/explan/TerminalExpression.java

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+package com.quinn.sjms.explan;
+
+public class TerminalExpression extends AbstractExpression {
+    @Override
+    public Object interpret() {
+        return null;
+    }
+}

sjms/src/main/java/com/quinn/sjms/flyweight/FlyWeightFactory.java

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+package com.quinn.sjms.flyweight;
+
+import java.util.HashMap;
+
+public class FlyWeightFactory {
+
+    private static HashMap<String,Flyweight> fPool = new HashMap();
+
+    //享元工厂
+    public static Flyweight getFlyweight(String Extrinsic){
+        //需要返回的对象
+        Flyweight flyweight = null;
+        //在池中没有该对象
+        if(fPool.containsKey(Extrinsic)){
+            flyweight = fPool.get(Extrinsic);
+        }else{
+            //根据外部状态创建享元对象
+            flyweight = new FlyweightImpl(Extrinsic);
+            //放置到池中
+            fPool.put(Extrinsic, flyweight);
+        }
+        return flyweight;
+    }
+
+
+}

sjms/src/main/java/com/quinn/sjms/flyweight/Flyweight.java

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+package com.quinn.sjms.flyweight;
+
+import lombok.Data;
+
+@Data
+public abstract class Flyweight {
+
+    //内部状态
+    private String intrinsic;
+    //外部状态
+    protected final String Extrinsic;
+
+    //要求享元角色必须接受外部状态
+    public Flyweight(String _Extrinsic){
+        this.Extrinsic = _Extrinsic;
+    }
+    //定义业务操作
+    public abstract void operate();
+
+}

sjms/src/main/java/com/quinn/sjms/flyweight/FlyweightImpl.java

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+package com.quinn.sjms.flyweight;
+
+public class FlyweightImpl extends Flyweight {
+
+    public FlyweightImpl(String _Extrinsic) {
+        super(_Extrinsic);
+    }
+
+    @Override
+    public void operate() {
+        System.out.println("Do 业务逻辑");
+    }
+}

sjms/src/main/java/com/quinn/sjms/status/Context.java

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+package com.quinn.sjms.status;
+
+public class Context {
+
+    //定义状态
+    public final static State STATE1 = new StateImpl();
+    public final static State STATE2 = new StateImpl2();
+
+    //当前状态
+    private State currentState;
+    //获得当前状态
+    public State getCurrentState() {
+        return currentState;
+    }
+    //设置当前状态
+    public void setCurrentState(State currentState) {
+        this.currentState = currentState;
+        //切换状态
+        this.currentState.setContext(this);
+    }
+
+    public void handle1(){
+        this.currentState.handle1();
+    }
+
+    public void handle2(){
+        this.currentState.handle2();
+    }
+
+}

sjms/src/main/java/com/quinn/sjms/status/State.java

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+package com.quinn.sjms.status;
+
+import lombok.Data;
+
+@Data
+public abstract class State {
+
+    Context context;
+
+    public abstract void handle1();
+
+    public abstract void handle2();
+
+}

sjms/src/main/java/com/quinn/sjms/status/StateImpl.java

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+package com.quinn.sjms.status;
+
+public class StateImpl extends State {
+    @Override
+    public void handle1() {
+        System.out.println("111我需要处理");
+    }
+
+    @Override
+    public void handle2() {
+        // 我不处理
+        this.context.setCurrentState(Context.STATE2);
+        this.context.handle2();
+    }
+}

sjms/src/main/java/com/quinn/sjms/status/StateImpl2.java

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+package com.quinn.sjms.status;
+
+public class StateImpl2 extends State {
+    @Override
+    public void handle1() {
+        // 我不处理
+        this.context.setCurrentState(Context.STATE1);
+        this.context.handle1();
+    }
+
+    @Override
+    public void handle2() {
+        System.out.println("222我需要处理");
+    }
+}

sjms/src/main/java/com/quinn/sjms/status/StatusClient.java

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+package com.quinn.sjms.status;
+
+public class StatusClient {
+
+    public static void main(String[] args) {
+        Context context = new Context();
+        context.setCurrentState(new StateImpl());
+        context.handle1();
+        context.handle2();
+    }
+
+}