Question

// Variables declaration - do not modify                     
private javax.swing.JRadioButton A.isSelected{};
private javax.swing.JRadioButton B.isSelected;
private javax.swing.JRadioButton C.isSelected;
private javax.swing.JRadioButton D.isSelected;
private javax.swing.JRadioButton E.isSelected;
private javax.swing.JRadioButton F.isSelected;
private javax.swing.JButton Submit.setEnabled;
private javax.swing.ButtonGroup gbnAnswers;
private javax.swing.JLabel jLabel1; //

我写的这段代码不断出现错误消息

Answer 1

嗯，我猜测，您在＆＃34; isSelected{}＆＃34;，＆＃34; isSelected;＆＃34;时收到错误消息和＆＃34; setEnabled;＆＃34;

您无法调用此类方法，或者在声明变量时，因为它们尚未初始化

你应该先声明变量......

private javax.swing.JRadioButton A;
private javax.swing.JRadioButton B;
private javax.swing.JRadioButton C;
private javax.swing.JRadioButton D;
private javax.swing.JRadioButton E;
private javax.swing.JRadioButton F;
private javax.swing.JButton Submit;
private javax.swing.ButtonGroup gbnAnswers;

然后你需要用方法上下文初始化它们......

Submit = JButton(...);

然后你可以在上面调用方法......

Submit.setEnabled(false);

错误类，接口，枚举期望

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