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我玩這個遊戲，你可以收集數百電源ups，知道他們做什麼而不記住他們的唯一方法是查找它們。正因爲如此，我試圖讓自己成爲一個「助手」程序，我可以輸入電源的名稱並獲得它的效果。不正確的打印字符串與從ArrayList空白
下面是帶有無用部分的完整代碼。輸出的例子如下。如果你看看輸出結果，問題應該相當明顯。我可以用什麼方法來解決這個問題，或者我做錯了什麼？
import java.util.ArrayList;
import java.util.Scanner;
public class ProgMain {
// // *** ------------*** and any variations indicate a change of importance or use
public static ArrayList<String> itemlist; // ArrayList of items to cycle through to see if item exists in database.
static {
itemlist = new ArrayList<String>();
itemlist.add("genericitem"); // testing item
itemlist.add("exit"); // allows for internal program exit
itemlist.add("debuglist"); // allows to print every item in "itemlist" for debug
// ***-------------------------------------------------***
itemlist.add(0, "thisitem hasaspace");
}
static Scanner console = new Scanner (System.in);
public static void main(String[] args) {
String item = " " // variable to store name of item
System.out.println("Enter an item name to check the database.");
System.out.println("Enter 'exit' to quit the program.");
System.out.println();
while(true) {
System.out.print("Item Name: ");
item = console.next().toLowerCase().replaceAll("\\s", " ");
/**
* ONLY FINDS FIRST WORD, even after removal of spaces.
*/
//DEBUG
System.out.print("\n DEBUG: " + item + "\n");
if (itemlist.contains(item)) { // cycle through database
displayItemProperties(item); // find item and print properties
System.out.println();
} else { // declares if the item isn't found in database
System.out.println("That item does not exist.");
System.out.println();
}
}
}
static void displayItemProperties(String item) {
/**
* Item names must be in LOWERCASE and have NO SPACES.
*/
// GENERIC IF STATEMENT
// Easy copy/paste to add new items
/*
if (item.equals("")) {
System.out.println("");
}
*/
// **----------------------------------**
if (item.equals("genericitem")) {
System.out.println("A generic item.");
}
if (item.equals("debuglist")) {
for (int i = 0; i < itemlist.size(); i++) {
System.out.println(itemlist.get(i));
}
}
if (item.equals("exit")) {
System.out.println("Application Terminating...");
System.exit(0);
}
// ***------------------------------------------------------***
if (item.equals("thisitem hasaspace")) {
System.out.println("If a name has a space, it wont show up correctly...");
}
// introduce new item declarations here
}
}
這是一些示例輸出不帶空格中輸入：
Enter an item name to check the database.
Enter 'exit' to quit the program.
Item Name: genericitem
DEBUG: genericitem
A generic item.
Item Name: exit
DEBUG: exit
Application Terminating...
，這是當使用帶有空格的名稱會發生什麼：
Enter an item name to check the database.
Enter 'exit' to quit the program.
Item Name: thisitem hasaspace
DEBUG: thisitem
That item does not exist.
Item Name:
DEBUG: hasaspace
That item does not exist.
Item Name: exit
DEBUG: exit
Application Terminating...