import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
public class ScrollJPanelDemo extends JFrame {
public ScrollJPanelDemo(){
setSize(480, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel label = new JLabel("Select one or more options : ");
JCheckBox jcb1 = new JCheckBox("Chandigarh");
JCheckBox jcb2 = new JCheckBox("Mohali");
JCheckBox jcb3 = new JCheckBox("Delhi");
JCheckBox jcb4 = new JCheckBox("Noida");
JCheckBox jcb5 = new JCheckBox("Mumbai");
JCheckBox jcb6 = new JCheckBox("Kolkata");
//creating JPanel to hold the checkboxes
JPanel jpnl = new JPanel();
jpnl.setLayout(null);
jpnl.setOpaque(true);
jcb1.setBounds(0,0,100,40);
jcb2.setBounds(0,60,100,40);
jcb3.setBounds(0,120,100,40);
jcb4.setBounds(0,180,100,40);
jcb5.setBounds(0,240,100,40);
jcb6.setBounds(0,300,100,40);
//adding check boxes and label to the JPanel
jpnl.add(label);
jpnl.add(jcb1);
jpnl.add(jcb2);
jpnl.add(jcb3);
jpnl.add(jcb4);
jpnl.add(jcb5);
jpnl.add(jcb6);
//creating the scroll pane that will scroll the panel.
JScrollPane jscrlPane = new JScrollPane(jpnl);
jscrlPane.setBounds(0,0,300,300);
jscrlPane.setHorizontalScrollBarPolicy
(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS) ;
jscrlPane.setVerticalScrollBarPolicy
(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
//adding that scroll pane to the frame.
getContentPane().add(jscrlPane);
setVisible(true);
}
public static void main(String args[]){
new ScrollJPanelDemo();
}
}
我是 Java Swing 新手,尝试在我的 Java 代码中使用滚动窗格,但它不起作用。滚动窗格已在垂直方向上添加到框架上,但未起作用。