是否有可能在一個Java文件聲明數組，並利用它們在不同的Java文件，如果他們都在同一個包

Question

那麼你將如何使用一個完全不同的Java文件，但在同一個包

public static void main (int[] args) 
{ 
int [] HotDog = {18,8,10,0}; 
int [] ToastedChicken = {25,8,17,0}; 
int [] ToastedSteak = {30,8,22,0}; 
int [] ToastedEggT= {20,8,6,6}; 
int [] ToastedSteakE={36,8,22,6}; 
int [] ChickenRoll = {25,8,17,0}; 
int [] SteakRoll = {30,8,22,0}; 
int [] EggTomato = {20,8,6,6}; 
int [] CheeseTomato = {20,8,6,6}; 
int [] steakEgg = {36,8,22,6};` 

IE這裏

if (contents == "Hot Dog") 

{jLabel2.setText(HotDog[2]); } 

Answer 1

你需要讓他們靜。例如：

final class MyConstants { 
    static final int[] HotDog = {18, 8, 10, 0}; 
    static final int[] ToastedChicken = {25, 8, 17, 0}; 
    static final int[] ToastedSteak = {30, 8, 22, 0}; 
    static final int[] ToastedEggT = {20, 8, 6, 6}; 
    static final int[] ToastedSteakE ={36, 8, 22, 6}; 
    static final int[] ChickenRoll = {25, 8, 17, 0}; 
    static final int[] SteakRoll = {30, 8, 22, 0}; 
    static final int[] EggTomato = {20, 8, 6, 6}; 
    static final int[] CheeseTomato = {20, 8, 6, 6}; 
    static final int[] SteakEgg = {36, 8, 22, 6}; 

    private MyConstants() { 
     // Prevents users of this class from instantiating a useless instance of 
     // this class, since all members are static. 
    } 
} 

然後你就可以在任何類在同一個包中使用它們，如：

if (contents.equals("Hot Dog")) { 
    jLabel2.setText(MyConstants.HotDog[2]); 
} 

Answer 2

你的陣列是目前本地的方法爲主。如果您將它們移到主方法之外（就像它們一樣），那麼其他類將可以看到其他類與包方式訪問相同的程序包。你需要有一個對這個類的引用（除非你讓它們是靜態的）。在下面的示例中，我打電話給類X

int [] HotDog = {18,8,10,0}; 
int [] ToastedChicken = {25,8,17,0}; 
int [] ToastedSteak = {30,8,22,0}; 
int [] ToastedEggT= {20,8,6,6}; 
int [] ToastedSteakE={36,8,22,6}; 
int [] ChickenRoll = {25,8,17,0}; 
int [] SteakRoll = {30,8,22,0}; 
int [] EggTomato = {20,8,6,6}; 
int [] CheeseTomato = {20,8,6,6}; 
int [] steakEgg = {36,8,22,6};` 

public static void main (int[] args) 
{ 
    jLabel2.setText(new X().HotDog[2]); //will return 10 
} 

此外，它是java在camelCase中命名變量的comon實踐。例如chickenRoll

Answer 3

，我會盡量讓那些Array爲static，所以所有的類試圖訪問這些陣列得到相同的陣列...

我也用Singleton Principle with Composition這裏...但是那爲此過度殺傷..

public class Test{ 
static int [] HotDog = {18,8,10,0}; 
static int [] ToastedChicken = {25,8,17,0}; 
static int [] ToastedSteak = {30,8,22,0}; 
static int [] ToastedEggT= {20,8,6,6}; 
static int [] ToastedSteakE={36,8,22,6}; 
static int [] ChickenRoll = {25,8,17,0}; 
static int [] SteakRoll = {30,8,22,0}; 
static int [] EggTomato = {20,8,6,6}; 
static int [] CheeseTomato = {20,8,6,6}; 
static int [] steakEgg = {36,8,22,6}; 

} 

public class AccessIt{ 


Test.HotDog; 


}