public class OrderBean implements WritableComparable {

private Integer order\_id; //整数用 writeInt()和readInt()  
private String pdt;   //文本类型 用 writeUTF()和readUTF()  
private Double price; //浮点数用 writeDouble()和readDouble()

@Override  
public void write(DataOutput dataOutput) throws IOException {  
    dataOutput.writeInt(order\_id);  
    dataOutput.writeUTF(pdt);  
    dataOutput.writeDouble(price);  
}

@Override  
public void readFields(DataInput dataInput) throws IOException {  
    this.order\_id=dataInput.readInt();  
    this.pdt=dataInput.readUTF();  
    this.price=dataInput.readDouble();  
}

@Override  
public String toString() {  
    return order\_id+"\\t"+pdt+"\\t"+price;  
}

@Override  
public int compareTo(OrderBean o) {  
    int i = Integer.compare(order\_id,o.getOrder\_id());  
    if (i!=0)  
        return i;

    return Double.compare(o.getPrice(),price);  
}

public Integer getOrder\_id() {  
    return order\_id;  
}

public void setOrder\_id(Integer order\_id) {  
    this.order\_id = order\_id;  
}

public Double getPrice() {  
    return price;  
}

public void setPrice(Double price) {  
    this.price = price;  
}

public String getPdt() {  
    return pdt;  
}

public void setPdt(String pdt) {  
    this.pdt = pdt;  
}  

}