将数组从一种方法调用到另一种方法[关闭]

Question

我有一个方法 A，我在其中创建了一个数组。现在我想在另一个方法 B 中使用数组，想知道是否有可能在方法 B 中调用方法 A 并使用数组而不是在我创建的每个方法中创建数组。

public static void myArray() {
    String[][] resultCard =  new String[][]{ 
                { " ", "A", "B", "C"},
                { "Maths", "78", "98","55"}, 
                { "Physics", "55", "65", "88"}, 
                { "Java", "73", "66", "69"},
             };
}

public static void A() {
    //Not sure how I can include the array (myArray) here   
}

public static void B() {
    //Not sure how I can include the array (myArray) here   
}

Answer 1

这是一个文字（评论）图解说明（问题和答案）：

public Object[] methodA() {
    // We are method A
    // In which we create an array
    Object[] someArrayCreatedInMethodA = new Object[10];
    // And we can returned someArrayCreatedInMethodA
    return someArrayCreatedInMethodA;
}

public void methodB() {
    // Here we are inside another method B
    // And we want to use the array
    // And there is a possibility that we can call the method A inside method B
    Object[] someArrayCreatedAndReturnedByMethodA = methodA();
    // And we have the array created in method A
    // And we can use it here (in method B)
    // Without creating it in method B again
}

编辑：

您编辑了您的问题并包含了您的代码。在您的代码中，数组不是在方法 A 中创建的，而是在 myArray() 中创建的，并且您没有返回它，因此在 myArray() 方法返回后它“丢失”了（如果曾经调用过）。

建议：将数组声明为类的属性，将其设为静态，您可以在a() 和b() 两种方法中简单地将其称为resultCard：

private static String[][] resultCard = new String[][] {
    { " ", "A", "B", "C"},
    { "Maths", "78", "98","55"},
    { "Physics", "55", "65", "88"},
    { "Java", "73", "66", "69"},
};

public static void A() {
    // "Not sure how I can include the array (myArray) here"
    // You can access it and work with it simply by using its name:
    System.out.println(resultCard[3][0]); // Prints "Java"
    resultCard[3][0] = "Easy";
    System.out.println(resultCard[3][0]); // Prints "Easy"
}