Lehekülje ITI0011:Loeng 11 lähteteksti vaatamine

Loengus kasutatav lähtekood:

<source lang="java">

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class UndoActionsExample {
	
	public static class Element {
		public Integer number;
	}
	
	public static abstract class Action {
		abstract void undo();
	}
	
	public static class AddAction extends Action {
		@Override
		void undo() {
		}
		
	}
	
	public static class ChangeAction extends Action {

		@Override
		void undo() {
		}
	}
	
	public static class DeleteAction extends Action {
		@Override
		void undo() {
		}
		
	}
	
	static List<Action> actions = new ArrayList<Action>();
	
	static List<Element> elements = new ArrayList<Element>();

	public static void main(String[] args) {
		
		addNumber(10);
		addNumber(20);
		addNumber(30);
		removeNumber(1);
		changeNumber(0, 5);
		print();

		undo(); print();
		undo(); print();
		undo(); print();
		undo(); print();
		undo(); print();
		
		
	}
	
	public static void addNumber(Integer number) {
	}
	
	public static void changeNumber(int index, Integer number) {
	}
	
	public static void removeNumber(int index) {
	}
	
	public static void print() {
		System.out.println(Arrays.toString(elements.toArray()));
	}
	public static void printActions() {
		System.out.println(Arrays.toString(actions.toArray()));
	}
	
	public static void undo() {
	}

}

</source>