Question

java新手。阅读其他一些问题，但尚未找到解决方案。我希望将 acname ， dob 和 balance1 （用户的所有输入）传递给另一个类。目前它导致nullnullnull。请帮忙：

头等舱：

public static String acname;
public static String dob;
public static String balance1;

public static void main(String[] args) {

            switch (menu) {

            case 1: Scanner sc=new Scanner(System.in);

                System.out.println("Please enter account holders name:");

                    String acname = sc.nextLine();

                    Scanner sc2=new Scanner(System.in);

                System.out.println("Please enter account holders date of birth:");

                    String dob = sc2.nextLine();

                    BankAccount balance1 = new BankAccount(0, 0.10);
                    balance1.getBalance();

                    System.out.println("Account Created. Overview and Balance: " + "\n" + acname + "\n" + dob + "\n" + "£" + balance1.getBalance() + "\n");

第二课：

public class MainMenu {

public static void main(String[] args) {

    System.out.println("--WELCOME TO BEAN BANKING LTD--");
    System.out.println("");
    System.out.println("1. Create new account");
    System.out.println("2. View account details and balance");
    System.out.println("3. Deactivate account");
    System.out.println("4. Exit System");

    Scanner scanner = new Scanner(System.in);
    int menu = scanner.nextInt();

    switch (menu) {
        case 1: AccountCreator.main(null);
        case 2: System.out.println(AccountCreator.acname + AccountCreator.dob + AccountCreator.balance1);

Answer 1

您声明的局部变量与您的类变量具有相同的名称。除非您符合对它们的引用，否则将假定局部变量。

而不是：

String acname = sc.nextLine();

只是做：

acname = sc.nextLine();

在类之间传递字符串

1 个答案: