Java GUI程序不是';t从BlueJ开始
我试着制作我的第一个GUI程序,我是Java的高手,只是按照一个教程来启动和运行。我一行一行地复制了下面的代码,试图理解发生了什么,总的来说我是。但是,程序无法在BlueJ中运行。虚拟机永远不会启动Java GUI程序不是';t从BlueJ开始,java,swing,constructor,bluej,Java,Swing,Constructor,Bluej,我试着制作我的第一个GUI程序,我是Java的高手,只是按照一个教程来启动和运行。我一行一行地复制了下面的代码,试图理解发生了什么,总的来说我是。但是,程序无法在BlueJ中运行。虚拟机永远不会启动 import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JComboBox; import javax.swing.JButton; import javax.swing.JLabel; import java
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();
}
}
方法有返回类型,构造函数没有-删除
void
关键字以便可以调用Swing代码
public GUI() {
^
阅读:方法有返回类型,构造函数没有-删除
void
关键字,以便调用Swing代码
public GUI() {
^
阅读:方法有返回类型,构造函数没有-删除
void
关键字,以便调用Swing代码
public GUI() {
^
阅读:方法有返回类型,构造函数没有-删除
void
关键字,以便调用Swing代码
public GUI() {
^
阅读: