Update

demos/demo9/command/Client.java

@@ -0,0 +1,37 @@
+
+public class Client {
+
+    private String helloMessage = "Hello!" ;
+    private Menu appMenu = new Menu() ;
+
+    public Menu getMenu() {
+        return appMenu ;
+    }
+
+    public void runSetup() {
+        String helloMessage = "Ciao!" ;
+        MenuItem hello = new MenuItem() ;
+        Command sayHello = new ConcreteCommand();
+        sayHello.setReceiver(
+                new Receiver() {
+                    public void doAction() {
+                        System.out.println( helloMessage );    
+                    }
+                }
+        );
+        hello.setCommand( sayHello );
+        appMenu.addMenuItem(hello, "hello");
+    }
+
+    public static void main( String [] args )
+    {
+        String helloMessage = "Bonjour!" ;
+        Client c = new Client() ;
+        c.runSetup() ;
+        Menu m = c.getMenu() ;
+        m.selectMenuItem("hello") ;
+    }
+
+
+}
+

demos/demo9/command/Command.java

@@ -0,0 +1,7 @@
+
+public interface Command {
+
+	public abstract void execute();
+	public abstract void setReceiver(Receiver target);
+}
+

demos/demo9/command/ConcreteCommand.java

@@ -0,0 +1,15 @@
+
+public class ConcreteCommand implements Command {
+
+    private Receiver theReceiver ;
+
+	public void execute() {
+	    theReceiver.doAction();
+	}
+
+	public void setReceiver(Receiver target) {
+	    theReceiver = target ;
+	}
+
+}
+

demos/demo9/command/Invoker.java

@@ -0,0 +1,7 @@
+
+public interface Invoker {
+
+	public abstract void setCommand(Command cmd);
+	public abstract void invoke();
+}
+

demos/demo9/lambda/8.higher-order/Makefile → demos/demo9/command/Makefile

@@ -3,9 +3,7 @@ all: clean
 clean: 
 	find . -name "*.class" -exec rm -rf {} \;
 
-compile:
-	javac *.java
-
 run:
-	java -cp . Main
+	javac *.java
+	java  Client
 

demos/demo9/command/Menu.java

@@ -0,0 +1,21 @@
+
+import java.util.HashMap;
+
+public class Menu {
+
+	private HashMap<String, MenuItem> menuItems = new HashMap<String, MenuItem>() ;
+
+    public void addMenuItem( MenuItem item, String key ) {
+        menuItems.put( key, item ) ;
+    }
+
+    public void selectMenuItem( String key ) {
+        MenuItem item = menuItems.get(key) ;
+        if ( item != null )
+            item.invoke();
+        else
+            System.out.println( "Menu Item Not Found: " + key );
+    }
+
+}
+

demos/demo9/command/MenuItem.java

@@ -0,0 +1,15 @@
+
+public class MenuItem implements Invoker {
+
+    private Command theCommand ;
+
+	public void setCommand(Command cmd) {
+	    theCommand = cmd ;
+	}
+
+	public void invoke() {
+	    theCommand.execute();
+	}
+
+}
+

demos/demo9/command/Receiver.java

@@ -0,0 +1,7 @@
+
+public interface Receiver {
+
+	public void doAction() ;
+
+}
+

demos/gaspump/Makefile

@@ -0,0 +1,25 @@
+all: clean
+
+clean: 
+	find . -name "*.class" -exec rm -rf {} \;
+	rm -rf build/*
+	rm -f *.log
+
+init:
+	gradle init
+	mkdir -p libs
+	mkdir -p src/main/java
+	mkdir -p src/test/java
+
+compile:
+	gradle build -x test --warning-mode all
+
+test:
+	gradle test
+
+jar: compile
+	gradle shadowJar
+
+run: jar
+	java -cp build/libs/gaspump-all.jar Main 2>debug.log
+

demos/gaspump/build.gradle

@@ -0,0 +1,65 @@
+/*
+ * This build file was auto generated by running the Gradle 'init' task
+ * by 'pnguyen' at '7/30/18 6:20 PM' with Gradle 3.2.1
+ *
+ * This generated file contains a commented-out sample Java project to get you started.
+ * For more details take a look at the Java Quickstart chapter in the Gradle
+ * user guide available at https://docs.gradle.org/3.2.1/userguide/tutorial_java_projects.html
+ */
+
+/*
+// Apply the java plugin to add support for Java
+apply plugin: 'java'
+
+// In this section you declare where to find the dependencies of your project
+repositories {
+    // Use 'jcenter' for resolving your dependencies.
+    // You can declare any Maven/Ivy/file repository here.
+    jcenter()
+}
+
+// In this section you declare the dependencies for your production and test code
+dependencies {
+    // The production code uses the SLF4J logging API at compile time
+    compile 'org.slf4j:slf4j-api:1.7.21'
+
+    // Declare the dependency for your favourite test framework you want to use in your tests.
+    // TestNG is also supported by the Gradle Test task. Just change the
+    // testCompile dependency to testCompile 'org.testng:testng:6.8.1' and add
+    // 'test.useTestNG()' to your build script.
+    testCompile 'junit:junit:4.12'
+}
+*/
+
+
+buildscript {
+    dependencies {
+        classpath fileTree(dir: 'libs', include: '*.jar')
+    }
+}
+
+plugins {
+    id 'java'
+    id 'com.github.johnrengelman.shadow' version '2.0.4'
+}
+
+repositories {
+    jcenter()
+}
+
+dependencies {
+    runtime fileTree(dir: 'libs', include: '*.jar')
+    compile fileTree(dir: 'libs', include: '*.jar')
+    compile group: 'junit', name: 'junit', version: '4.+'
+    compile group: 'org.slf4j', name: 'slf4j-api', version: '1.7.21'
+    testCompile group: 'junit', name: 'junit', version: '4.+'
+}
+
+shadowJar {
+    baseName = 'gaspump'
+}
+
+
+
+
+

demos/gaspump/debug.log

@@ -0,0 +1,21 @@
+# lines: 1
+line # 01
+line len: 23
+pad size: 9
+new line:          Do you want a Car Wash?
+new message:          Do you want a Car Wash?
+
+# lines: 1
+line # 01
+line len: 23
+pad size: 9
+new line:          Select Car Wash Package
+new message:          Select Car Wash Package
+
+# lines: 1
+line # 01
+line len: 16
+pad size: 12
+new line:             Credit or Debit?
+new message:             Credit or Debit?
+