如何修复“找不到符号错误"为我的程序?

How to fix quot;cannot find symbol errorquot; for my program?(如何修复“找不到符号错误为我的程序?)

问题描述

我很难找到为什么我不断收到此消息:

I am struggling to find why I keep receiving this message:

Integer.java:13: error: cannot find symbol
         num = Integer.parseInt(numStr);
                      ^
  symbol:   method parseInt(String)
  location: class Integer
Integer.java:16: error: cannot find symbol
         num2 = String.parseInt(numStr2);
                      ^
  symbol:   method parseInt(String)
  location: class String
2 errors

我错过了什么吗?谢谢.

Is there something I missed? Thanks.

import javax.swing.JOptionPane;

public class Integer
{
   public static void main (String[] args)
   {
      String numStr, numStr2, sum, product;
      int num, num2, again;

      do
      {
         numStr = JOptionPane.showInputDialog("Enter an integer: ");
         num = Integer.parseInt(numStr);

         numStr2 = JOptionPane.showInputDialog("Enter another integer: ");
         num2 = Integer.parseInt(numStr2);

         sum = "The sum is " + ((num + num2));
         product = " and  the product is " + ((num * num2));

         JOptionPane.showMessageDialog(null, sum);
         again = JOptionPane.showConfirmDialog(null, "Do Another?");
      }

      while (again == JOptionPane.YES_OPTION);
  }
}

推荐答案

你应该把你的类重命名为另一个名字，也许叫它IntegerMachine"而不是Integer".Java 已经有一个名为Integer"的本机类，通过命名您自己的类，这意味着您调用的不是您想要的 java.lang.Integer.parseInt(string)，而是调用 .Integer.parseInt()，后者不存在.

You should rename your class to another name, perhaps call it "IntegerMachine" and not "Integer". Java already has a native class with the name "Integer", and by naming your own class the same would mean that instead of calling java.lang.Integer.parseInt(string), which you intended, you are calling .Integer.parseInt(), for which the latter does not exist.

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