这是作业,但我需要一个“微调”。我无法找到如何按名称排序。试图理解排序方法。 Java作业
我的问题:(请将答案初学型)
- 做什么都看的权利这么远?
- 如何排序?
- 有没有人有优化/清洁这个建议?
这里是分配:
的库存计划第2部分检查点在6个星期,由于有以下要求:
修改清单方案,以便应用程序能处理多个项目。使用数组来存储项目。
输出应该一次显示一个产品的信息,包括产品编号,产品名称,库存单位数量,每个单位的价格以及该产品库存的价值。
此外,输出应显示整个库存的值。
创建一个方法来计算整个库存的价值。
创建另一种按产品名称对数组项进行排序的方法。
为了满足这些需求,您需要将以下添加到您的库存类(非产品类):
1)声明类型产品(私有的实例变量)
数组2)内,您的主要while循环,执行以下操作:
a. Instantiate a product object b. Populate the product object with the input from the console (like Inventory Part 1 does) c. Add the product object reference to the next element in your array d. Destroy the reference to the product object variable (note this object was added to your array so you can set the local variable that refers to the object to null)
3)你的主while循环之外,做到以下几点:
a. Call a method in your Inventory class to sort the array of Product objects. Note you need to sort an array of Product objects by the Product Name instance variable. To do this, you will need to create a separate .java file that implements the Comparator interface. You will pass the Product array and implemented Comparator interface class as arguments to the sort method of the Arrays class (part of the Java API). b. Create a For Loop that iterates through the array of Product objects (similar to the one I have below). Invoke the get method on each instance variable and format the output by calling printf. Sample For Loop to use: for (Product product : productArray) { Add statements here } c. Call a method in your Inventory class to calculate the total inventory value of all the Product objects in your array.
这里是我的代码
public class InvTest2{// main method begins
public static void main(String args[]) {
int version = 2;// Version number
final int invLeng = 5;// Declare Inv length
// Welcome message
System.out.printf("\n%s%d\n" ,
"Welcome to the Inventory Program v.", version);
Inv[] DVDs = new Inv[invLeng];
DVDs[0] = new Inv("The Invisible Man", 0, 8.50); // new DVD constructor
DVDs[1] = new Inv("The Matrix", 1, 17.99);
DVDs[2] = new Inv("Se7en", 7, 12.99);
DVDs[3] = new Inv("Oceans Eleven", 11, 9.99);
DVDs[4] = new Inv("Hitch Hikers Guide to the Galaxy", 42, 18.69);
// Display formatted results
int c = 0;
double runningValue = 0;
System.out.printf("\n%s\n", "Inventory of DVD movies");
while(c != DVDs.length){
System.out.printf("\n\n%s%d\n%s%s\n%s%d\n%s%,.2f\n%s%,.2f\n",
"Item Number: ",c,
"DVD Title: ",DVDs[c].getdvdTitle(),
"Copies in stock: ",DVDs[c].getdvdInStock(),
"Price each disk: $",DVDs[c].getdvdValue(),
"Value of copies: $",DVDs[c].getdvdStockValue());//End print
runningValue += DVDs[c].getdvdStockValue();
c++;
}
System.out.printf("\n%s%,.2f\n",
"Collection Value: $",runningValue);
}// end method main
}//end class Inventory1
这里是库存
public class Inv {//Begin DVD class
// Declare instance variables
String dvdTitle;// Declare title as string
int dvdInStock;// Declare dvdInStock as float
double dvdValue;// Declare dvdValue as float
// constructor initializes DVD information
public Inv(String title, int inStock, double value) { // Initialize (clear) instance variables here
dvdTitle = title;
dvdInStock = inStock;
dvdValue = value;
} // end constructor
public String getdvdTitle() {// public method to get the DVD name
return dvdTitle;}// end method getdvdTitle
public int getdvdInStock() {// public method to retrieve the dvdInStock
return dvdInStock;} // end method get dvdInStock
public double getdvdValue() {// public method to retrieve the dvdValue
return dvdValue;} // end method get dvdValue
public double getdvdStockValue() {// public method to dvdStockValue
return (dvdValue * dvdInStock);}// end method get dvdStockValue
} // end class Inv
你的代码不符合你的老师提供的要求。你可能希望从那里开始。 – doomspork 2009-08-20 18:03:16
对不起,编辑clobber。如果你觉得自己做得不好,请将我的身后卷起来。 – Welbog 2009-08-20 18:06:29
寻求家庭作业帮助的问题是,没有人再也不必再做家庭作业,他们想要做。你最好问一些关于你遇到的实际问题的更具体的问题 – mkoryak 2009-08-20 18:08:25