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java - 编译器错误 : "class, interface, or enum expected"

转载 作者:太空狗 更新时间:2023-10-29 22:43:42 28 4
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我已经对这个程序进行了数小时的故障排除,尝试了几种配置,但都没有成功。它是用java写的,有33个错误(从之前的50个减少了)

源代码:

/*This program is named derivativeQuiz.java, stored on a network drive I have permission to edit
The actual code starts below this line (with the first import statement) */
import java.util.Random;
import java.Math.*;
import javax.swing.JOptionPane;
public static void derivativeQuiz(String args[])
{
// a bunch of code
}

错误日志(在JCreator中编译):

--------------------Configuration: <Default>--------------------
H:\Derivative quiz\derivativeQuiz.java:4: class, interface, or enum expected
public static void derivativeQuiz(String args[])
^
H:\Derivative quiz\derivativeQuiz.java:9: class, interface, or enum expected
int maxCoef = 15;
^
H:\Derivative quiz\derivativeQuiz.java:10: class, interface, or enum expected
int question = Integer.parseInt(JOptionPane.showInputDialog(null, "Please enter the number of questions you wish to test on: "));
^
H:\Derivative quiz\derivativeQuiz.java:11: class, interface, or enum expected
int numExp = Integer.parseInt(JOptionPane.showInputDialog(null, "Please enter the maximum exponent allowed (up to 5 supported):" ));
^
H:\Derivative quiz\derivativeQuiz.java:12: class, interface, or enum expected
Random random = new Random();
^
H:\Derivative quiz\derivativeQuiz.java:13: class, interface, or enum expected
int coeff;
^
H:\Derivative quiz\derivativeQuiz.java:14: class, interface, or enum expected
String equation = "";
^
H:\Derivative quiz\derivativeQuiz.java:15: class, interface, or enum expected
String deriv = "";
^
H:\Derivative quiz\derivativeQuiz.java:16: class, interface, or enum expected
for(int z = 0; z <= question; z++)
^
H:\Derivative quiz\derivativeQuiz.java:16: class, interface, or enum expected
for(int z = 0; z <= question; z++)
^
H:\Derivative quiz\derivativeQuiz.java:16: class, interface, or enum expected
for(int z = 0; z <= question; z++)
^
H:\Derivative quiz\derivativeQuiz.java:19: class, interface, or enum expected
deriv = "";
^
H:\Derivative quiz\derivativeQuiz.java:20: class, interface, or enum expected
if(numExp >= 5)
^
H:\Derivative quiz\derivativeQuiz.java:23: class, interface, or enum expected
equation = coeff + "X^5 + ";
^
H:\Derivative quiz\derivativeQuiz.java:24: class, interface, or enum expected
deriv = coeff*5 + "X^4 + ";
^
H:\Derivative quiz\derivativeQuiz.java:25: class, interface, or enum expected
}
^
H:\Derivative quiz\derivativeQuiz.java:29: class, interface, or enum expected
equation = equation + coeff + "X^4 + ";
^
H:\Derivative quiz\derivativeQuiz.java:30: class, interface, or enum expected
deriv = deriv + coeff*4 + "X^3 + ";
^
H:\Derivative quiz\derivativeQuiz.java:31: class, interface, or enum expected
}
^
H:\Derivative quiz\derivativeQuiz.java:35: class, interface, or enum expected
equation = equation + coeff + "X^3 + ";
^
H:\Derivative quiz\derivativeQuiz.java:36: class, interface, or enum expected
deriv = deriv + coeff*3 + "X^2 + ";
^
H:\Derivative quiz\derivativeQuiz.java:37: class, interface, or enum expected
}
^
H:\Derivative quiz\derivativeQuiz.java:41: class, interface, or enum expected
equation = equation + coeff + "X^2 + ";
^
H:\Derivative quiz\derivativeQuiz.java:42: class, interface, or enum expected
deriv = deriv + coeff*2 + "X + ";
^
H:\Derivative quiz\derivativeQuiz.java:43: class, interface, or enum expected
}
^
H:\Derivative quiz\derivativeQuiz.java:47: class, interface, or enum expected
equation = equation + coeff + "X + ";
^
H:\Derivative quiz\derivativeQuiz.java:48: class, interface, or enum expected
deriv = deriv + coeff;
^
H:\Derivative quiz\derivativeQuiz.java:49: class, interface, or enum expected
}
^
H:\Derivative quiz\derivativeQuiz.java:53: class, interface, or enum expected
equation = equation + coeff;
^
H:\Derivative quiz\derivativeQuiz.java:54: class, interface, or enum expected

if(deriv == "")
^
H:\Derivative quiz\derivativeQuiz.java:57: class, interface, or enum expected
}
^
H:\Derivative quiz\derivativeQuiz.java:114: class, interface, or enum expected
JOptionPane.showMessageDialog(null, "Question " + z + "\\" + question + "\nDerivative: " + deriv);
^
H:\Derivative quiz\derivativeQuiz.java:115: class, interface, or enum expected
}
^
33 errors

Process completed.

我觉得这是一个基本错误,但我似乎找不到它。如果它有所作为,我正在使用 JCreator 进行编译并且一切都已正确安装。

更新:我已经修复了涉及的错误(类声明和不正确的导入语句(有人回去删除了几个分号))

工作代码:

import java.util.Random;
import javax.swing.JOptionPane;
import java.lang.String;
public class derivativeQuiz_source{
public static void main(String args[])
{
//a bunch more code
}
}

感谢大家的帮助

最佳答案

你错过了类声明。

public class DerivativeQuiz{
public static void derivativeQuiz(String args[]){ ... }
}

关于java - 编译器错误 : "class, interface, or enum expected",我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12749994/

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