同一个包中的两个类
具有公共静态和实例变量组合的主类。
它创建了一个名为instance
的类的实例。
另一个类Login
,而不是子类,它的业务,但我想从main调用guiInstance的方法。
问题是我似乎无法让它工作,我不能让Login
类找到“gui”实例或类的任何方法,尽管它们是公开的。
我刚用我想要的配置创建了一个新包,显然我对调用方法的工作方式有错误的想法。
public class GUI {
JPanel jp = new JPanel();
public static void main(String[] args) {
GUI instance = new GUI();
}
public void ping(){
System.out.println("that worked");
}
}
public class Login extends JPanel {
/** Creates new form Login */
public Login() {
initComponents();
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jButton1 = new javax.swing.JButton();
jButton1.setText("jButton1");
jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton1MouseClicked(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(112, 112, 112)
.addComponent(jButton1)
.addContainerGap(215, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(46, 46, 46)
.addComponent(jButton1)
.addContainerGap(231, Short.MAX_VALUE))
);
}// </editor-fold>
private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
instance.ping();
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
// End of variables declaration
}
答案 0 :(得分:1)
您的GUI
方法中有main()
个实例,但您似乎无法创建Login
的实例。我建议您将GUI
实例传递给Login
构造函数,因此在Login
中添加类似的内容 -
private GUI gui = null;
public Login(GUI gui) {
this.gui = gui;
initComponents();
}
然后在main()
你可以做类似的事情,
public static void main(String[] args) {
GUI instance = new GUI();
Login login = new Login(instance);
// next I believe you need to make your Frame and components visible
}