MyException cannot be resolved to a type 和The declared package "" does not match the expected package "work1"

这两个错误通常出现在 Java 代码中，可能是由于以下原因：

1. MyException 类未被正确导入或未被正确定义。请检查代码中是否存在 MyException 类，并确保正确导入该类。

2. 包名不匹配。请确保代码中声明的包名与实际代码所在的包名匹配。

如果您仍无法解决这些问题，请尝试重新编译代码或与其他开发者讨论该问题。

相关问题

unreported exception MyException; must be caught or declared to be thrown throw new MyException("用户名小于三位Exception");

在Java编程语言中，"unreported exception MyException; must be caught or declared to be thrown" 这段错误信息提示你在代码中遇到了一个未处理的`MyException`异常。当你在一个方法中声明了一个可能会抛出特定异常的`throws`关键字，或者在代码中直接使用了`throw`关键字抛出了这个异常，如果没有匹配的`catch`块来捕获它，那么你需要做两个事情之一：

1. **捕获并处理异常**：你应该添加一个`try-catch`块来捕获并处理这个异常，例如：

   try {
       throw new MyException("用户名小于三位Exception");
   } catch (MyException e) {
       // 处理异常逻辑
       System.out.println(e.getMessage());
   }

2. **声明异常将被抛出**：如果当前方法无法处理该异常，你可以声明这个异常将会被传递给上一层调用者。在方法签名中加入`throws MyException`，如下所示：

   public void someMethod() throws MyException {
       if (/* 条件导致异常 */) {
           throw new MyException("用户名小于三位Exception");
       }
   }

这样，调用这个方法的代码需要处理或者向上抛出这个异常。

2. Define an exception class MyException, which is thrown if the result is not in the range [-32768, 32767] in the method multiply that computes the product of two integers. Define a main class MyExceptionTest that contains the following methods: public static int multiply(int n1, int n2) throws MyException { int result; result=n1*n2; if (result<-32768 || result>32767) throw new MyException(n1+"*"+n2+"的积超出[-32768,32767]的范围！"); return result; } Finally, write codes that can print the product of two integers in the main method of the main class

Here is the implementation of the MyException class and the MyExceptionTest class:

class MyException extends Exception {
    public MyException(String message) {
        super(message);
    }
}

public class MyExceptionTest {
    public static int multiply(int n1, int n2) throws MyException {
        int result = n1 * n2;
        if (result < -32768 || result > 32767)
            throw new MyException(n1 + "*" + n2 + "的积超出[-32768,32767]的范围！");
        return result;
    }

    public static void main(String[] args) {
        int n1 = 10000, n2 = 10000;
        try {
            int result = multiply(n1, n2);
            System.out.println(n1 + " * " + n2 + " = " + result);
        } catch (MyException e) {
            System.out.println(e.getMessage());
        }
    }
}

In the main method, we call the multiply method to compute the product of two integers. If the result is out of the range [-32768, 32767], a MyException will be thrown. We catch the exception and print the error message.