Question

我想在java的swing库中创建一个简单的GUI，它包含一个项目列表（特定类的项目）。我还想要一个除了列表之外的框，其中包含一个文本字段和一个用于向列表添加新项目的按钮（此项目将使文本字段中的内容作为其标题）。我环顾四周但没找到一个像样的教程。任何指向正确教程或简短示例的链接都表示赞赏。

Answer 1

试试这个例子，但当然可以根据您的需要对其进行格式化。您还需要向按钮添加动作侦听器。如果你不知道怎么做，我可以告诉你。

您可以使用和修改下面的代码示例，或者您可以使用本教程教您有关Swing的所有知识：http://docs.oracle.com/javase/tutorial/uiswing/index.html

此示例是使用NetBeans Gui Builder生成的。

public class NewJFrame15 extends javax.swing.JFrame {

/**
 * Creates new form NewJFrame15
 */
public NewJFrame15() {
    initComponents();
}                    
private void initComponents() {

    jScrollPane1 = new javax.swing.JScrollPane();
    jList1 = new javax.swing.JList();
    jPanel1 = new javax.swing.JPanel();
    jTextField1 = new javax.swing.JTextField();
    jButton1 = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jList1.setModel(new javax.swing.AbstractListModel() {
        String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
        public int getSize() { return strings.length; }
        public Object getElementAt(int i) { return strings[i]; }
    });
    jScrollPane1.setViewportView(jList1);

    jPanel1.setBorder(new javax.swing.border.SoftBevelBorder(javax.swing.border.BevelBorder.LOWERED));

    jButton1.setText("Add");

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    jPanel1.setLayout(jPanel1Layout);
    jPanel1Layout.setHorizontalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 111, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, 114, Short.MAX_VALUE)
            .addContainerGap())
    );
    jPanel1Layout.setVerticalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jButton1))
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );

    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()
            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 133, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 335, Short.MAX_VALUE))
            .addContainerGap())
    );

    pack();
}                    

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {

    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(NewJFrame15.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(NewJFrame15.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(NewJFrame15.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(NewJFrame15.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new NewJFrame15().setVisible(true);
            Math.random();
        }
    });
}                 
private javax.swing.JButton jButton1;
private javax.swing.JList jList1;
private javax.swing.JPanel jPanel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextField jTextField1;       
}

Answer 2

您可以使用JCheckBoxes为下拉菜单选择特定项目或JComboBox。这里可以使用构造函数http://docs.oracle.com/javase/tutorial/uiswing/。

此外，添加项http://docs.oracle.com/javase/6/docs/api/javax/swing/JComboBox.html#addItem%28java.lang.Object%29方法允许您为JComboBox使用文本字段输入。

Answer 3

我建议从文本框和按钮开始，将结果写入屏幕或日志以查看它是否正常工作。
http://www.javabeginner.com/java-swing/java-jtextfield-class-example

然后处理显示列表，并使用文本框中的数据刷新列表作为最后一步。列表（请注意“向列表添加项目和从列表中删除项目”部分）：http://docs.oracle.com/javase/tutorial/uiswing/components/list.html

带列表和添加项的简单GUI

3 个答案: