ok是个按键,怎样在我点击了时候,他能使链表中的数据切到下一个啊?
ok.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent Event)
{
for(int i=0;i<list.size();){
Iterator<Student> it=list.iterator();
while(it.hasNext()){
Student s=it.next();
nameinput.setText(s.getId());
passwordinput.setText(s.getName());
i++;
}
}
}
});
ok.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent Event)
{
for(int i=0;i<list.size();){
Iterator<Student> it=list.iterator();
while(it.hasNext()){
Student s=it.next();
nameinput.setText(s.getId());
passwordinput.setText(s.getName());
i++;
}
}
}
});
http://hiphotos.baidu.com/g882/pic/item/506600c899da393a7e3e6f53.jpg
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Iterator;
import java.util.LinkedList; class first extends JPanel
{
static final int WIDTH=300;
static final int HEIGHT=150;
JFrame loginframe; public void add(Component c,GridBagConstraints constraints,int x,int y,int w,int h)
{
constraints.gridx=x;
constraints.gridy=y;
constraints.gridwidth=w;
constraints.gridheight=h;
add(c,constraints);
} //此方法用来添加控件到容器中 first()
{
loginframe=new JFrame("学生信息查看系统");
loginframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GridBagLayout lay=new GridBagLayout();
setLayout(lay);
loginframe.add(this, BorderLayout.WEST);
loginframe.setSize(WIDTH,HEIGHT);
Toolkit kit=Toolkit.getDefaultToolkit();
Dimension screenSize=kit.getScreenSize();
int width=screenSize.width;
int height=screenSize.height;
int x=(width-WIDTH)/2;
int y=(height-HEIGHT)/2;
loginframe.setLocation(x,y);
JButton ok=new JButton("下一个");
JButton cancel=new JButton("退出");
JLabel title=new JLabel("学生信息");
JLabel id=new JLabel("学号:");
JLabel name=new JLabel("姓名:");
final JTextField nameinput=new JTextField(15);
final JTextField passwordinput=new JTextField(15);
GridBagConstraints constraints=new GridBagConstraints();
constraints.fill=GridBagConstraints.NONE;
constraints.anchor=GridBagConstraints.EAST;
constraints.weightx=3;
constraints.weighty=4;
add(title,constraints,0,0,4,1); //使用网格组布局添加控件
add(id,constraints,0,1,1,1);
add(name,constraints,0,2,1,1);
add(nameinput,constraints,2,1,1,1);
add(passwordinput,constraints,2,2,1,1);
add(ok,constraints,0,3,1,1);
add(cancel,constraints,2,3,1,1);
loginframe.setResizable(false);
loginframe.setVisible(true);
Connection con;
String url1="jdbc:odbc:xsxx"; ///定义数据库的URL
String username=""; ///用户名
String password=""; ///密码
final LinkedList<Student> list=new LinkedList<Student>();
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
///登陆到建立的数据源上去,也可以说登陆到数据库上去
con=DriverManager.getConnection(url1,username,password);
Statement st=con.createStatement();
String sql="select * from xs";
ResultSet rs=st.executeQuery(sql);
//JOptionPane.showMessageDialog(null, "123");
while(rs.next())
{
// 放入list中
list.add(new Student(rs.getString(1),rs.getString(2)));
Iterator<Student> it=list.iterator();
while(it.hasNext()){
Student s=it.next();
System.out.println(s.getId()+" "+s.getName());
}
}
st.close();
con.close();
}
catch(SQLException e)
{e.printStackTrace();
}
catch(ClassNotFoundException ex)
{ex.printStackTrace();} ok.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent Event)
{
for(int i=0;i<list.size();){
Iterator<Student> it=list.iterator();
while(it.hasNext()){
Student s=it.next();
nameinput.setText(s.getId());
passwordinput.setText(s.getName());
i++;
}
}
}
});
cancel.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent Event)
{
loginframe.dispose();
}
});
}
public static void main(String[] args) {
first f1=new first();
}
}
private int count = 0;
List<Integer> list = new ArrayList<Integer>(); T() {
for (int i = 0; i < 10; i++) {
list.add(i);
}
} public void press() {
System.out.println(list.get(count));
} @Override
public void run() {
while (true) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
press();
count++;
if (count == list.size()) {
count = 0;
}
}
} public static void main(String[] args) {
new Thread(new T()).start();
}
}
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.*; class first extends JPanel implements ActionListener
{
static final int WIDTH=300;
static final int HEIGHT=150;
final JTextField nameinput;
final JTextField passwordinput;
Iterator<Student> it1;
final LinkedList<Student> list=new LinkedList<Student>();
int number=0;
JFrame loginframe; public void add(Component c,GridBagConstraints constraints,int x,int y,int w,int h)
{
constraints.gridx=x;
constraints.gridy=y;
constraints.gridwidth=w;
constraints.gridheight=h;
add(c,constraints);
} //此方法用来添加控件到容器中
first()
{
loginframe=new JFrame("学生信息查看系统");
loginframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GridBagLayout lay=new GridBagLayout();
setLayout(lay);
loginframe.add(this, BorderLayout.WEST);
loginframe.setSize(WIDTH,HEIGHT);
Toolkit kit=Toolkit.getDefaultToolkit();
Dimension screenSize=kit.getScreenSize();
int width=screenSize.width;
int height=screenSize.height;
int x=(width-WIDTH)/2;
int y=(height-HEIGHT)/2;
loginframe.setLocation(x,y);
JButton ok=new JButton("下一个");
JButton cancel=new JButton("退出");
JLabel title=new JLabel("学生信息");
JLabel id=new JLabel("学号:");
JLabel name=new JLabel("姓名:");
nameinput=new JTextField(15);
passwordinput=new JTextField(15);
GridBagConstraints constraints=new GridBagConstraints();
constraints.fill=GridBagConstraints.NONE;
constraints.anchor=GridBagConstraints.EAST;
constraints.weightx=3;
constraints.weighty=4;
add(title,constraints,0,0,4,1); //使用网格组布局添加控件
add(id,constraints,0,1,1,1);
add(name,constraints,0,2,1,1);
add(nameinput,constraints,2,1,1,1);
add(passwordinput,constraints,2,2,1,1);
add(ok,constraints,0,3,1,1);
add(cancel,constraints,2,3,1,1);
loginframe.setResizable(false);
loginframe.setVisible(true);
Connection con;
String url1="jdbc:odbc:xsxx"; ///定义数据库的URL
String username=""; ///用户名
String password=""; ///密码
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
///登陆到建立的数据源上去,也可以说登陆到数据库上去
con=DriverManager.getConnection(url1,username,password);
Statement st=con.createStatement();
String sql="select * from xs";
ResultSet rs=st.executeQuery(sql);
//JOptionPane.showMessageDialog(null, "123");
while(rs.next())
{
// 放入list中
list.add(new Student(rs.getString(1),rs.getString(2)));
}
st.close();
con.close();
} catch(SQLException e)
{e.printStackTrace();
}
catch(ClassNotFoundException ex)
{ex.printStackTrace();}
it1=list.iterator();
Student student=it1.next();
this.nameinput.setText(student.getName());
this.passwordinput.setText(student.getId());
ok.addActionListener(this);
cancel.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent Event)
{
loginframe.dispose();
}
});
}
public static void main(String[] args) {
first f1=new first();
}
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
Student student=it1.next();
this.nameinput.setText(student.getName());
this.passwordinput.setText(student.getId());
}
}
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.*; class first extends JPanel implements ActionListener
{
static final int WIDTH=300;
static final int HEIGHT=150;
final JTextField nameinput;
final JTextField passwordinput;
Iterator <Student> it1;
final LinkedList <Student> list=new LinkedList <Student>();
int number=0;
JFrame loginframe; public void add(Component c,GridBagConstraints constraints,int x,int y,int w,int h)
{
constraints.gridx=x;
constraints.gridy=y;
constraints.gridwidth=w;
constraints.gridheight=h;
add(c,constraints);
} //此方法用来添加控件到容器中
first()
{
loginframe=new JFrame("学生信息查看系统");
loginframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GridBagLayout lay=new GridBagLayout();
setLayout(lay);
loginframe.add(this, BorderLayout.WEST);
loginframe.setSize(WIDTH,HEIGHT);
Toolkit kit=Toolkit.getDefaultToolkit();
Dimension screenSize=kit.getScreenSize();
int width=screenSize.width;
int height=screenSize.height;
int x=(width-WIDTH)/2;
int y=(height-HEIGHT)/2;
loginframe.setLocation(x,y);
JButton ok=new JButton("下一个");
JButton cancel=new JButton("退出");
JLabel title=new JLabel("学生信息");
JLabel id=new JLabel("学号:");
JLabel name=new JLabel("姓名:");
nameinput=new JTextField(15);
passwordinput=new JTextField(15);
GridBagConstraints constraints=new GridBagConstraints();
constraints.fill=GridBagConstraints.NONE;
constraints.anchor=GridBagConstraints.EAST;
constraints.weightx=3;
constraints.weighty=4;
add(title,constraints,0,0,4,1); //使用网格组布局添加控件
add(id,constraints,0,1,1,1);
add(name,constraints,0,2,1,1);
add(nameinput,constraints,2,1,1,1);
add(passwordinput,constraints,2,2,1,1);
add(ok,constraints,0,3,1,1);
add(cancel,constraints,2,3,1,1);
loginframe.setResizable(false);
loginframe.setVisible(true);
Connection con;
String url1="jdbc:odbc:xsxx"; ///定义数据库的URL
String username=""; ///用户名
String password=""; ///密码
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
///登陆到建立的数据源上去,也可以说登陆到数据库上去
con=DriverManager.getConnection(url1,username,password);
Statement st=con.createStatement();
String sql="select * from xs";
ResultSet rs=st.executeQuery(sql);
//JOptionPane.showMessageDialog(null, "123");
while(rs.next())
{
// 放入list中
list.add(new Student(rs.getString(1),rs.getString(2)));
}
st.close();
con.close();
} catch(SQLException e)
{e.printStackTrace();
}
catch(ClassNotFoundException ex)
{ex.printStackTrace();}
it1=list.iterator();
Student student=it1.next();
this.nameinput.setText(student.getName());
this.passwordinput.setText(student.getId());
ok.addActionListener(this);
cancel.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent Event)
{
loginframe.dispose();
}
});
}
public static void main(String[] args) {
first f1=new first();
}
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
Student student=it1.next();
this.nameinput.setText(student.getName());
this.passwordinput.setText(student.getId());
}
}
Iterator <Student> it=list.iterator();
while(it.hasNext()){
Student s=it.next();
System.out.println(s.getId()+" "+s.getName()); 标记,学习一下迭代使用.