invoker.java

来自「《Java与模式》一书的源代码」· Java 代码 · 共 20 行

package com.javapatterns.command.document;

public class Invoker
{
    private Command command;

    public Invoker(Command cmd)
    {
        command = cmd;
    }

    public void invoke()
    {
        if (command != null)
        {
            command.execute();
        }
    }
}