类似下面的代码,我需要让它在即使只有一个“a”的时候也能滚动(这好像有点象Excel)import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JScrollPane1 implements ActionListener
{
JScrollPane scrollPane;
public JScrollPane1()
{
JFrame f = new JFrame("JScrollPaneDemo");
Container contentPane = f.getContentPane();
//JLabel label1 = new JLabel(new ImageIcon(".\\icons\\flower.jpg"));
JLabel label1 = new JLabel("aaa");
JPanel panel1 = new JPanel();
panel1.add(label1);
scrollPane = new JScrollPane(panel1);
JPanel panel2 = new JPanel(new GridLayout(3,1));
JButton b = new JButton("显示水平滚动轴");
b.addActionListener(this);
panel2.add(b);
b = new JButton("不显示水平滚动轴");
b.addActionListener(this);
panel2.add(b);
b = new JButton("适时显示水平滚动轴");
b.addActionListener(this);
panel2.add(b);
contentPane.add(panel2,BorderLayout.WEST);
contentPane.add(scrollPane,BorderLayout.CENTER);
f.setSize(new Dimension(350,220));
f.show();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e)
{
if (e.getActionCommand().equals("显示水平滚动轴"))
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
if (e.getActionCommand().equals("不显示水平滚动轴"))
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
if (e.getActionCommand().equals("适时显示水平滚动轴"))
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollPane.revalidate();
}
public static void main(String[] arg)
{
new JScrollPane1();
}
}
import java.awt.event.*;
import javax.swing.*;
public class JScrollPane1 implements ActionListener
{
JScrollPane scrollPane;
public JScrollPane1()
{
JFrame f = new JFrame("JScrollPaneDemo");
Container contentPane = f.getContentPane();
//JLabel label1 = new JLabel(new ImageIcon(".\\icons\\flower.jpg"));
JLabel label1 = new JLabel("aaa");
JPanel panel1 = new JPanel();
panel1.add(label1);
scrollPane = new JScrollPane(panel1);
JPanel panel2 = new JPanel(new GridLayout(3,1));
JButton b = new JButton("显示水平滚动轴");
b.addActionListener(this);
panel2.add(b);
b = new JButton("不显示水平滚动轴");
b.addActionListener(this);
panel2.add(b);
b = new JButton("适时显示水平滚动轴");
b.addActionListener(this);
panel2.add(b);
contentPane.add(panel2,BorderLayout.WEST);
contentPane.add(scrollPane,BorderLayout.CENTER);
f.setSize(new Dimension(350,220));
f.show();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e)
{
if (e.getActionCommand().equals("显示水平滚动轴"))
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
if (e.getActionCommand().equals("不显示水平滚动轴"))
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
if (e.getActionCommand().equals("适时显示水平滚动轴"))
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollPane.revalidate();
}
public static void main(String[] arg)
{
new JScrollPane1();
}
}
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;public class MainForm {
public static void main(String[] arg)
{
JFrame frame=new JScrollPane1();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}}
class JScrollPane1 extends JFrame implements ActionListener
{
JScrollPane scrollPane; public JScrollPane1()
{
// JFrame f = new JFrame("JScrollPaneDemo");
// Container contentPane = f.getContentPane(); //JLabel label1 = new JLabel(new ImageIcon(".\\icons\\flower.jpg"));
JLabel label1 = new JLabel("a");
JPanel panel1 = new JPanel();
panel1.add(label1);
scrollPane = new JScrollPane(panel1); JPanel panel2 = new JPanel(new GridLayout(3,1));
JButton b = new JButton("显示水平滚动轴");
b.addActionListener(this);
panel2.add(b);
b = new JButton("不显示水平滚动轴");
b.addActionListener(this);
panel2.add(b);
b = new JButton("适时显示水平滚动轴");
b.addActionListener(this);
panel2.add(b); add(panel2,BorderLayout.WEST);
add(scrollPane,BorderLayout.CENTER); setSize(new Dimension(350,220));
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
} public void actionPerformed(ActionEvent e)
{
if (e.getActionCommand().equals("显示水平滚动轴"))
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
if (e.getActionCommand().equals("不显示水平滚动轴"))
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
if (e.getActionCommand().equals("适时显示水平滚动轴"))
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollPane.revalidate();
}
public static void main(String[] arg)
{
new JScrollPane1();
}
}
长度不够 JSCROLLPANE不滚动 这是很正常的情况 如果有滚动条 那么他又没东西滚出来,也失去了意义
如果看得到也得用的话真的如上楼所说的失去意义了!!