图书馆课

JAR 库的访问点是一个扩展 Library 类的类。 库的主要工作是列出通过库可用的工具； 大多数情况下，这些工具都是用于添加定义的各种组件的工具 - 即与不同组件工厂一起使用的 AddTool 类的实例。

Components

package com.cburch.gray;

import java.util.Arrays;
import java.util.List;

import com.cburch.logisim.tools.AddTool;
import com.cburch.logisim.tools.Library;

/** The library of components that the user can access. */
public class Components extends Library {
    /** The list of all tools contained in this library. Technically,
     * libraries contain tools, which is a slightly more general concept
     * than components; practically speaking, though, you'll most often want
     * to create AddTools for new components that can be added into the circuit.
     */
    private List<AddTool> tools;
    
    /** Constructs an instance of this library. This constructor is how
     * Logisim accesses first when it opens the JAR file: It looks for
     * a no-arguments constructor method of the user-designated class.
     */
    public Components() {
        tools = Arrays.asList(new AddTool[] {
                new AddTool(new GrayIncrementer()),
                new AddTool(new SimpleGrayCounter()),
                new AddTool(new GrayCounter()),
        });
    }
    
    /** Returns the name of the library that the user will see. */ 
    public String getDisplayName() {
        return "Gray Tools";
    }
    
    /** Returns a list of all the tools available in this library. */
    public List<AddTool> getTools() {
        return tools;
    }
}

Next: Simple Gray Code Counter .