[英]Get Value from JComboBox
我有 2 列的JComboBox
和JButton
。 當我單擊JButton
時,我需要分別從第一列和第二列中獲取JComboBox
選擇值的結果...
我該怎么做?
另外:如何設置那個 JComboBox 的 header?
代碼:
public class Combo extends JFrame implements ActionListener{
private JComboBox combo = new JComboBox();
private JButton button = new JButton();
public Combo() {
setLayout(new FlowLayout());
combo.setRenderer(new render());
add(combo);
combo.addItem(new String[] {"1","bbb"});
combo.addItem(new String[] {"2","ff"});
combo.addItem(new String[] {"3","gg"});
combo.addItem(new String[] {"4","ee"});
add(button);
button.addActionListener(this);
pack();
}
public static void main(String[]args){
new Combo().setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==button){
System.out.println(combo.getSelectedItem());
}
}
}
class render extends JPanel implements ListCellRenderer{
private JLabel label1 = new JLabel();
private JLabel label2 = new JLabel();
private JLabel label3 = new JLabel();
private JLabel label4 = new JLabel();
private JLabel label5 = new JLabel();
public render() {
setLayout(new GridLayout(2,5));
add(label1);
add(label2);
}
@Override
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
String[] values = (String[]) value;
label1.setText(values[0]);
label2.setText(values[1]);
if(index ==0){
label1.setForeground(Color.red);
label2.setForeground(Color.red);
}else{
label1.setForeground(Color.white);
label2.setForeground(Color.white);
}
return this;
}
}
謝謝。
您的項目是字符串數組,因此您可以按如下方式打印所選項目:
System.out.println(Arrays.toString((String[])combo.getSelectedItem()));
編輯:
String[] selectedItem = (String[])combo.getSelectedItem();
for (int i = 0; i < selectedItem.length; i++){
System.out.println(String.format("item %s = %s", i, selectedItem[i]));
}
或者很快,如果你需要的只是第一項 - (String[])combo.getSelectedItem())[0]
。
要顯示所選元素的第一個值,您可以使用:
System.out.println(((String[])combo.getSelectedItem())[0]);
我認為這可能比以前的答案更容易:
(String) comboBox.getSelectedItem();
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