从一个方法调用数组到另一个方法

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中使用该数组,并且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)说明的解释(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:

您编辑了问题并包含了代码.在你的代码中,数组不是在方法A中创建的,而是在myArray(),并且你没有返回它,所以它在myArray()方法返回后被"丢失" (如果它被调用).

建议:你的声明数组作为类的属性,使其静态的,你可以简单地称其为resultCard从两种方法a()和b():

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"
}