[英]GUI program isn't starting in BlueJ
我試圖制作自己的第一個GUI程序,但我對Java不熟悉,只是遵循了一個教程來啟動並運行它。 我逐行復制了以下代碼,試圖了解正在發生的事情,總的來說,我是。 但是,該程序無法在BlueJ中運行。 虛擬機永遠不會啟動。
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JComboBox;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JList;
import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class GUI{
public void GUI(){
JFrame guiFrame1= new JFrame();
guiFrame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
guiFrame1.setTitle("First GUI");
guiFrame1.setSize(300,250);
guiFrame1.setLocationRelativeTo(null);
String[] fruitOptions = {"Apple", "Apricot", "Banana"
,"Cherry", "Date", "Kiwi", "Orange", "Pear", "Strawberry"};
//Options for the JList
String[] vegOptions = {"Asparagus", "Beans", "Broccoli", "Cabbage"
, "Carrot", "Celery", "Cucumber", "Leek", "Mushroom"
, "Pepper", "Radish", "Shallot", "Spinach", "Swede"
, "Turnip"};
//fruits
final JPanel comboPanel= new JPanel();
JLabel comboLbl= new JLabel("Fruits");
JComboBox fruits = new JComboBox(fruitOptions);
comboPanel.add(comboLbl);
comboPanel.add(fruits);
//veg
final JPanel listPanel= new JPanel();
listPanel.setVisible(false);
JLabel listLbl1= new JLabel("Vegetables:");
JList vegs= new JList (vegOptions);
vegs.setLayoutOrientation(JList.HORIZONTAL_WRAP);
listPanel.add(listLbl1);
listPanel.add(vegs);
//button
JButton vegFruitBut = new JButton("Fruit or Veg");
vegFruitBut.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent event)
{
listPanel.setVisible(!listPanel.isVisible());
comboPanel.setVisible(!comboPanel.isVisible());
}
});
guiFrame1.add(comboPanel, BorderLayout.NORTH);
guiFrame1.add(listPanel, BorderLayout.CENTER);
guiFrame1.add(vegFruitBut,BorderLayout.SOUTH);
guiFrame1.setVisible(true);
}
public static void main(String args[]){
GUI s= new GUI();
}
}
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