'class' or 'interface' expected 编译错误

Question

class Account
{  private double balance;
  public Account(double initialbalance)
   {if(initialbalance>0.0)
     balance=initialbalance;
   }
  public void debit(double amount)
  {
    if(amount>balance)
      {balance=balance+0.0;
       System.out.print("debit amount exceeded amount balance!");
      }
    else  balance=balance-amount;
  }
  public double getbalance()
  {
    return balance;
  }
}
  import java.util.Scanner;
    public class Accounttest
    {  public static void main(String args[])
        { double deposit; 
       Account account1=new Account(50.00);
       Account account2=new Account(-2.00);
       System.out.print("account1 balance:%.2f\n",account1.getbalance());
       System.out.print("account2 balance:%.2f\n",account2.getbalance());
       Scanner input=new Scanner(System.in);
       System.out.print("input deposit amount for account1:");
        
       deposit=input.nextdouble();
       account1.debit(deposit);
        }
      }
   
      编译出现错误;'class' or 'interface' expected  请问是什么问题？

Answer 1

你这两个class是在Accounttest.java文件里的吧？把import 这句放到文件第一行去。

Answer 2

C:\>javac Accounttest.java
Accounttest.java:27: cannot find symbol
symbol  : method print(java.lang.String,double)
location: class java.io.PrintStream
       System.out.print("account1 balance:%.2f\n",account1.getbalance());
                 ^
Accounttest.java:28: cannot find symbol
symbol  : method print(java.lang.String,double)
location: class java.io.PrintStream
       System.out.print("account2 balance:%.2f\n",account2.getbalance());
                 ^
Accounttest.java:32: cannot find symbol
symbol  : method nextdouble()
location: class java.util.Scanner
       deposit=input.nextdouble();
出现更多错误啊。晕 
 deposit=input.nextdouble();这句应该没错吧？
                    ^

Answer 3

System.out.print("account1 balance:%.2f\n",account1.getbalance());printf，不是print

Answer 4

import 只能放在package下面,类的上面

Answer 5

<1> import java.util.Scanner 放在最前面　package下面
 　<2>deposit=input.nextdouble()--> deposit=input.nextDouble();
　 <3>print－－＞printf
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