Erro do compilador: “classe, interface ou enumeração esperada”

Eu tenho problemas deste programa por horas, tento várias configurações e não tenho sorte. Foi escrito em Java e compreende 33 erros (contra 50 antes)

O log de erros (compilado no jcreator ):

--------------------Configuration: <Default>--------------------H:\Derivative quiz\derivativeQuiz.java:4: class, interface, or enum expectedpublic 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 errorsProcess completed.

Eu tenho a impressão de que é um erro básico, e ainda não consigo encontrá-lo. Se fizer a diferença, uso o JCRERETOR para compilar e tudo está instalado corretamente.

Atualização: Eu corrigi os erros envolvidos (declaração de classe e declarações de importação incorretas (alguém retornou e excluiu alguns semicolons))

Código de trabalho:

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