Package com.example.renderer.command

Interface Command

All Known Implementing Classes:
AddShapeCommand
public interface Command
Command接口定义了命令模式中的命令操作。

所有具体命令必须实现execute()执行操作和undo()撤销操作。 与UndoManager配合使用可实现操作的撤销/重做功能。

典型用法： 

 Command cmd = new AddShapeCommand(shapes, new Circle(10,10,5));
 cmd.execute(); // 执行命令
 cmd.undo();    // 撤销命令
Since:
1.0
Author:
liying
See Also:

  • Method Summary

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

  • Method Details

    • execute

      void execute()
      Executes the command operation. Implementations should perform the actual operation here.

    • undo

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