netbean + swing

入门推荐   http://java.sun.com/docs/books/tutorial/uiswing/index.html

 

 

---------------------------------helloworld

 

"Hello World!" for the NetBeans IDE

 

netbean 新建项目 应用程序,贴上代码，点运行就可以看到弹出效果

 

package javaapplication1;
import javax.swing.*;
public class Main {

   private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("HelloWorldSwing");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Add the ubiquitous "Hello World" label.
        JLabel label = new JLabel("Hello World");
        frame.getContentPane().add(label);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }

}

 

 

 

--------------------------------Opening a Project for an Example   [netbean]

 

In NetBeans IDE, choose File > Open Project. In the file chooser, select the project and click Open Project Folder.

 

 

error:{".../j2se-project/3":test-roots} is expected =========>>>>

 

project.xml     Code:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://www.netbeans.org/ns/project/1">
    <type>org.netbeans.modules.java.j2seproject</type>
    <configuration>
        <data xmlns="http://www.netbeans.org/ns/j2se-project/3">
            <name>TreeDemo</name>
            <minimum-ant-version>1.6.5</minimum-ant-version>
            <source-roots>
                <root id="src.dir"/>
            </source-roots>
        </data>
    </configuration>
</project>


to be changed to
Code:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://www.netbeans.org/ns/project/1">
    <type>org.netbeans.modules.java.j2seproject</type>
    <configuration>
        <data xmlns="http://www.netbeans.org/ns/j2se-project/3">
            <name>TreeDemo</name>
            <minimum-ant-version>1.6.5</minimum-ant-version>
            <source-roots>
                <root id="src.dir"/>
            </source-roots>
            <test-roots>
                <root id="test.src.dir"/>
            </test-roots>
        </data>
    </configuration>
</project>

 

 

再次导入即可

 

 

 

-----------------------------在 NetBeans IDE 中设计 Swing GUI

 

在 NetBeans IDE 中设计 Swing GUI

 

安装插件 GUI生成器,这样  在“项目”窗口中，右键单击 "ContactEditor" 节点，然后选择“新建”>“JFrame 窗体 ”。

 

 

 

 

 

------------------------------ 温度转换

 

 

 

 

package javaapplication1;

/**
 *
 * @author Administrator
 */
public class CelsiusConverterGUI extends javax.swing.JFrame {

    /** Creates new form CelsiusConverterGUI */
    public CelsiusConverterGUI() {
        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.
     */
    // <editor-fold defaultstate="collapsed" desc=" Generated Code ">//GEN-BEGIN:initComponents
    private void initComponents() {
        tempTextField = new javax.swing.JTextField();
        celsiusLabel = new javax.swing.JLabel();
        convertButton = new javax.swing.JButton();
        fahrenheitLabel = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Celsius Converter");

        celsiusLabel.setText("Celsius");

        convertButton.setText("Convert");
        convertButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                convertButtonActionPerformed(evt);
            }
        });

        fahrenheitLabel.setText("Fahrenheit");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(tempTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(celsiusLabel))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(convertButton)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(fahrenheitLabel)))
                .addContainerGap(27, Short.MAX_VALUE))
        );

        layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {convertButton, tempTextField});

        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(tempTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(celsiusLabel))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(convertButton)
                    .addComponent(fahrenheitLabel))
                .addContainerGap(21, Short.MAX_VALUE))
        );
        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void convertButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_convertButtonActionPerformed
//Parse degrees Celsius as a double and convert to Fahrenheit
        int tempFahr = (int)((Double.parseDouble(tempTextField.getText()))
            * 1.8 + 32);
        fahrenheitLabel.setText(tempFahr + " Fahrenheit");
    }//GEN-LAST:event_convertButtonActionPerformed

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new CelsiusConverterGUI().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JLabel celsiusLabel;
    private javax.swing.JButton convertButton;
    private javax.swing.JLabel fahrenheitLabel;
    private javax.swing.JTextField tempTextField;
    // End of variables declaration//GEN-END:variables

}