Command pattern

design-pattern/src/Command/Application.java

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+package Command;
+
+import java.util.PriorityQueue;
+
+public class Application {
+
+    public static void main(String[] args) {
+
+        PriorityQueue<Command> queue = new PriorityQueue<>();
+
+        queue.add(new StringPrintCommand("A"));
+        queue.add(new StringPrintCommand("AB"));
+        queue.add(new StringPrintCommand("ABC"));
+        queue.add(new StringPrintCommand("ABCD"));
+
+        for (Command command : queue) {
+            command.execute();
+        }
+    }
+}

design-pattern/src/Command/Command

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+Command Pattern
+ - 명령의 객체화

design-pattern/src/Command/Command.java

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+package Command;
+
+public interface Command extends Comparable<Command>{
+
+    void execute();
+}

design-pattern/src/Command/StringPrintCommand.java

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+package Command;
+
+public class StringPrintCommand implements Command{
+
+    private final String string;
+
+    public StringPrintCommand(String string) {
+        this.string = string;
+    }
+
+    @Override
+    public void execute() {
+        System.out.println(this.string);
+    }
+
+    @Override
+    public int compareTo(Command o) {
+        return this.string.length() - ((StringPrintCommand) o).string.length();
+    }
+
+}