查找用于UI的命令模式的示例

public interface Command {
    void execute();
}

public class AddCommand implements Command {
    private Calculator calculator;
    private int operand;

    public AddCommand(Calculator calculator, int operand) {
        this.calculator = calculator;
        this.operand = operand;
    }

    @Override
    public void execute() {
        calculator.add(operand);
    }
}

public class CalculatorUI {
    private Calculator calculator;

    public void init() {
        JButton addButton = new JButton("+");
        addButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                int operand = Integer.parseInt(JOptionPane.showInputDialog("Enter operand:"));
                Command command = new AddCommand(calculator, operand);
                command.execute();
            }
        });
    }
}