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
}

修改

您修改了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，并且您不会返回它，因此它会丢失＆＃34;在myArray()方法返回后（如果它被调用）。

建议：将您的数组声明为您的类的属性，将其设置为静态，然后您可以从resultCard和a()两种方法中将其称为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" }

从一个方法调用数组到另一个方法

1 个答案: