Package com.example.renderer.command

Class AddShapeCommand

java.lang.Object

com.example.renderer.command.AddShapeCommand

All Implemented Interfaces:

Command

public class AddShapeCommand
extends Object
implements Command

Command implementation for adding a shape to a shape list. Supports undo operation by removing the added shape.

Constructor Summary

Constructors

Constructor	Description
AddShapeCommand(List<Shape> shapes, Shape shape)	创建添加图形命令实例

Method Summary

Modifier and Type	Method	Description
void	execute()	Executes the command operation.
void	undo()	Undoes the command operation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AddShapeCommand

public AddShapeCommand(List<Shape> shapes,
 Shape shape)

创建添加图形命令实例

Parameters:

shapes - 目标图形列表(非null)

shape - 要添加的图形(非null)

Throws:

NullPointerException - 如果参数为null

Method Details

execute

public void execute()

Description copied from interface: Command

Executes the command operation. Implementations should perform the actual operation here.

Specified by:

execute in interface Command

undo

public void undo()

Description copied from interface: Command

Undoes the command operation. Implementations should revert the execute() operation here.

Specified by:

undo in interface Command