商店买东西清单显示（46_2）

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Title:SaleEntry.java
discription:1、get、set方法用于获取单号，获取单价，计算打折，并计算出最终的价格。

2、数值计算相关方法的处理
@Copyright:
@Company:
@autor:firefly
@version:1.0
@time:2013.1.2

package bean;

/** Simple bean to illustrate the various forms
* of jsp:setProperty.
*/

public class SaleEntry {
private String itemID = "unknown";
private double discountCode = 1.0;
private int numItems = 0;

public String getItemID() {
return(itemID);
}

public void setItemID(String itemID) {
    if (itemID != null) {
      this.itemID = itemID;
    } else {
      this.itemID = "unknown";
    }
}

public double getDiscountCode() {
return(discountCode);
}

public void setDiscountCode(double discountCode) {
this.discountCode = discountCode;
}

public int getNumItems() {
return(numItems);
}

public void setNumItems(int numItems) {
    this.numItems = numItems;
}

// Replace this with real database lookup.

public double getItemCost() {
    double cost;
    if (itemID.equals("a1234")) {
      cost = 12.99*getDiscountCode();
    } else {
      cost = -9999;
    }
    return(roundToPennies(cost));
}

private double roundToPennies(double cost) {
return(Math.floor(cost*100)/100.0);

//Math.foor()可将小数点后的数字给截了，Math.floor(cost*100)/100.0则把小数点后两位的保留，将3位及3位以后的截掉
}

public double getTotalCost() {
return(getItemCost() * getNumItems());
}
}