CommandManager.java

import java.util.Stack;

public class CommandManager {
    private Stack<Command> undoStack = new Stack<>();
    private Stack<Command> redoStack = new Stack<>();

    public void executeCommand(Command command) {
        command.execute();
        undoStack.push(command);
        redoStack.clear(); // Clear redo stack when a new command is executed
    }

    public boolean undo() {
        if (!undoStack.isEmpty()) {
            Command command = undoStack.pop();
            command.undo();
            redoStack.push(command);
            return true; // Indicate that undo was successful
        }
        return false; // Indicate that there was nothing to undo
    }

    public boolean redo() {
        if (!redoStack.isEmpty()) {
            Command command = redoStack.pop();
            command.execute();
            undoStack.push(command);
            return true; // Indicate that redo was successful
        }
        return false; // Indicate that there was nothing to redo
    }

    public boolean canUndo() {
        return !undoStack.isEmpty();
    }

    public boolean canRedo() {
        return !redoStack.isEmpty();
    }

    public Stack<Command> getUndoStack() {
        return undoStack;
    }

    public Stack<Command> getRedoStack() {
        return redoStack;
    }

}