Question

那么你如何使用完全不同的java文件，但在同一个包中

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在这里

if (contents ==  "Hot Dog")

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

Answer 1

您需要将它们设为静态。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.
    }
}

然后你可以在同一个包中的任何类中使用它们，如：

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

Answer 2

我会尝试将那些Array设为static，因此尝试访问这些数组的所有类都会获得相同的数组...

我本可以在这里使用Singleton Principle with Composition ......但这样做太过分了。

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;


}

Answer 3

您的数组当前是方法main的本地数组。如果您将它们移出main方法之外（完全如此），那么对于其他类，可以看到它们与包访问相同的包。您需要具有该类的引用（除非您将它们设置为静态）。在下面的例子中，我正在调用类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
}

java中的comon实践也是在camelCase中命名变量。例如chickenRoll

是否可以在一个java文件中声明数组，如果它们都在同一个包中，则在不同的java文件中使用它们

3 个答案: