Question

我在方法名称下面有红线，为什么会发生这种情况？

Scanner input=new Scanner(System.in);
System.out.println("enter your account number");
int account_num= input.nextInt();
System.out.println("enter your name");
String account_owner=input.nextLine();
System.out.println("enter your account balance");
double current_balance=input.nextDouble();

System.out.println("enter 1 to deposit \nenter 2 to withdraw"
        +"\nenter 3 to add interest value"
        +"\nenter 4 to print all the information");
int option= input.nextInt();


if (option==1){
    System.out.println("enter the amount of money to be depsit");
    double Damount=input.nextDouble();  
    double a =Deposit(Damount,current_balance);
    System.out.print(a);
        public static double Deposit(double amount, double balance){
            balance+=amount;
            System.out.println("transction successful");

       }}

Answer 1

您使用方法声明了一个方法。而且您的存款方法没有返回值。但是你的方法声明的返回类型为double。

删除以下代码并在方法

的外面执行

  public static double Deposit(double amount, double balance)
    {
        balance += amount;
        System.out.println("transction successful");
        return balance;   // missing return type
    }

而不是

if (option==1){
    System.out.println("enter the amount of money to be depsit");
    double Damount=input.nextDouble();  
    double a =Deposit(Damount,current_balance);
    System.out.print(a);
        public static double Deposit(double amount, double balance){
            balance+=amount;
            System.out.println("transction successful");

       }}

Answer 2

您在方法中有一个方法 - public static double Deposit。那是无效的。

Answer 3

您需要在方法中没有方法。

    if (option==1) {
        System.out.println("enter the amount of money to be depsit");
        double Damount=input.nextDouble();  
        double a =Deposit(Damount,current_balance);
        System.out.print(a);
    } //end of if
} // end of method

public static double Deposit(double amount, double balance){
    balance+=amount;
    System.out.println("transction successful");
}

方法没有运行

3 个答案: