52 lines
1.0 KiB
Java
52 lines
1.0 KiB
Java
//: patterns/CommandPattern.java
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// ©2015 MindView LLC: see Copyright.txt
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import java.util.*;
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interface Command {
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void execute();
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}
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class Hello implements Command {
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@Override
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public void execute() {
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System.out.print("Hello ");
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}
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}
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class World implements Command {
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@Override
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public void execute() {
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System.out.print("World! ");
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}
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}
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class IAm implements Command {
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@Override
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public void execute() {
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System.out.print("I'm the command pattern!");
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}
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}
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// A Command object that holds commands:
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class Macro implements Command {
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private ArrayList<Command> commands =
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new ArrayList<>();
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public void add(Command c) { commands.add(c); }
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@Override
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public void execute() {
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commands.forEach(Command::execute);
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}
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}
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public class CommandPattern {
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public static void main(String args[]) {
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Macro macro = new Macro();
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macro.add(new Hello());
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macro.add(new World());
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macro.add(new IAm());
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macro.execute();
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}
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} /* Output:
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Hello World! I'm the command pattern!
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*///:~
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