Example Analysis of traversing JAVA Array
This article mainly introduces the JAVA array traversal example analysis, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.
/ *
Case study of implementing inventory management:
1. Store commodity information
Store commodity type variables
Store variables of commodity types in the collection
2. View inventory
Traverse the collection to get the Goods type variables stored in the collection
Output the properties of each Goods type
Calculate the sum: total inventory, total amount
3. Modify the inventory of goods
Traversing the collection to get the Goods type variables stored in the collection
Variable calls the property count of the Goods class, and the value is modified (keyboard input)
, /
/ / import java.util.ArrayList
Import java.util.*
Public class Shopp {
Public static void main (String [] args) {
/ / create an ArrayList collection to store Goods types
ArrayList array = new ArrayList ()
/ / call the method of adding commodity information
AddGoods (array)
/ / enter into an endless cycle
While (true) {
/ / call the method of selecting a function to obtain the function serial number entered by the user
Int number = chooseFunction ()
/ / A pair of serial numbers are judged, if = 1 enters the view inventory function = 2 enters the modify inventory function = 3 ends
Switch (number) {
Case 1:
/ / enter to view inventory, call the method to view inventory, and pass a collection of stored product information
PrintStore (array)
Break
Case 2:
/ / enter the function of modifying inventory, call the method of modifying inventory, and pass the collection
Update (array)
Break
Case 3:
Return
Default:
System.out.println ("without this feature")
Break
}
}
}
/ *
Method definition, modify inventory
Keyboard input, change the property values in Goods, modify
, /
Public static void update (ArrayList array) {
Scanner sc = new Scanner (System.in)
/ / iterate through the collection to get each element in the collection
For (int I = 0; I < array.size (); iTunes +) {
/ / the collection method get gets the element of the collection. The element type is Goods.
Goods g = array.get (I)
System.out.println ("Please enter the inventory number of" + g.brand+ ")
/ / Goods attribute, which is modified by count
G.count = sc.nextInt ()
}
}
/ *
Define the method, realize the selection menu, and the user selects the menu according to the function.
, /
Public static int chooseFunction () {
System.out.println ("- inventory management -")
System.out.println ("1. View inventory")
System.out.println ("2. Modify inventory quantity")
System.out.println ("3. Quit")
System.out.println ("Please enter the operation number to be performed:")
Scanner sc = new Scanner (System.in)
Int number = sc.nextInt ()
Return number
}
/ *
Define methods, view inventory, traverse collections
, /
Public static void printStore (ArrayList array) {
/ / output header
System.out.println ("- Mall inventory -")
System.out.println ("Brand Model size Price inventory")
/ / define variables, save total inventory, and total amount
Int totalCount = 0
Double totalMoney = 0
/ / traverse the collection
For (int I = 0; I < array.size (); iTunes +) {
/ / get (index) gets the elements in the collection, stores the Goods class, and also gets the Goods type
/ / use Goods type variable to accept the result of get method
Goods g = array.get (I)
System.out.println (g.brand + "" + g.size+ "" + g.price+ "" + g.count)
TotalCount = totalCount+g.count
TotalMoney = totalMoney + g.count*g.price
}
System.out.println ("Total inventory:" + totalCount)
System.out.println ("Total inventory amount:" + totalMoney)
}
/ *
Define a method to store information about items in a collection
The collection is the shared data of all methods, and parameters are passed.
, /
Public static void addGoods (ArrayList array) {
/ / create a commodity type variable, a Goods type variable
Goods G1 = new Goods ()
Goods G2 = new Goods ()
G1.brand = "MacBook"
G1.size = 13.3
G1.price = 9999.99
G1.count = 3
G2.brand = "Thinkpad"
G2.size = 15.6
G2.price = 7999.99
G2.count = 1
/ / variables of type Goods, stored in the collection
Array.add (G1)
Array.add (G2)
}
}
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