Commodity.java

package edu.mama.ls16.homework;

public class Commodity {
private String ID;
private String name; //商品名称
private String model; //商品型号

public Commodity(String ID, String name, String model) {<br />        this.ID = ID;<br />        this.name = name;<br />        this.model = model;<br />    }<br />    public Commodity(String ID, String name) {<br />        this.ID = ID;<br />        this.name = name;<br />        this.model = null;<br />    }
public String getID() {<br />        return ID;<br />    }
public String getName() {<br />        return name;<br />    }
public String getModel() {<br />        return model;<br />    }
public void setName(String name) {<br />        this.name = name;<br />    }
public void setModel(String model) {<br />        this.model = model;<br />    }
//以sep为分隔符，将Commodity内容拼接成字符串<br />    public String toString(String sep) {<br />        StringBuilder sb=new StringBuilder();<br />        sb.append(this.ID).append(sep).append(this.name).append(sep).append(this.model);<br />        return sb.toString();<br />    }
//使用Map，重写equals和hasCode方法<br />    @Override<br />    public boolean equals(Object obj) {<br />        if(this==obj)<br />            return true;                        //地址相等<br />        if(obj instanceof Commodity){<br />            Commodity other=(Commodity)obj;<br />            if(this.ID.equals(other.ID))<br />                return true;                    //ID相同<br />        }<br />        return false;<br />    }
@Override<br />    public int hashCode() {<br />        return this.ID.hashCode();<br />    }<br />}