50 lines
979 B
Java
50 lines
979 B
Java
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//: patterns/CommandPattern.java
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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 commands = 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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Iterator it = commands.iterator();
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while(it.hasNext())
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((Command)it.next()).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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} ///:~
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