java swing 下拉框與文本框
阿新 • • 發佈:2017-10-09
str xtend exception int mst def edit ntp swing
import java.awt.*; import javax.swing.*; import javax.swing.border.*; import java.awt.event.*; public class Test extends JFrame { private JPanel jPane;//大的面板 private JTextField textField;//文本框 public JComboBox comboBox;//下拉選擇框 public static String a =null; public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { Test frame = new Test(); frame.setVisible(true); // 設置窗口可見 } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public Test() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // EXIT_ON_CLOSE相當於執行System.exit(0);的動作方法退出應用程序,關閉進程 // 如果不寫這句話點擊X我們也能關閉窗口,但是在後臺進程裏面我們會發現我們的進程數並不減少 setBounds(200, 200, 400, 400);//首次點開,發現距離屏幕左邊,上方200,長寬均為400 jPane = new JPanel(); jPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(jPane); jPane.setLayout(null); //按照規定的位置顯示,否則按照默認的FlowLayout(每個JPanel對象初始化時都使用FlowLayout布局,)布局顯示的 comboBox = new JComboBox(); String[] select = {"選項一","選項二","選項三"}; // 添加選項值 comboBox.setModel(new DefaultComboBoxModel(select)); comboBox.setBounds(15, 15, 100, 25); jPane.add(comboBox); textField = new JTextField(); textField.setBounds(150, 15, 76, 22); jPane.add(textField); textField.setText("選項一"); comboBox.addItemListener(new ItemListener() { @Override public void itemStateChanged(ItemEvent e) { if(e.getStateChange() == ItemEvent.SELECTED) { textField.setText(comboBox.getSelectedItem().toString()); a = textField.getText(); System.out.print(a); } } }); } }
java swing 下拉框與文本框