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java简单代码图片 java图形代码大全

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求一个简单的java代码：（图形界面）import java.awt.Color;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class vv extends JDialog {
private static final long serialVersionUID = 1L;
private JLabel l_Id = new JLabel("登陆账户", JLabel.CENTER);
private JLabel l_pw = new JLabel("登陆密码", JLabel.CENTER);
private JTextField t_Id = new JTextField(10);
private JPasswordField t_pw = new JPasswordField(10);
private JButton btnLogin;
private JButton btnClose;
public vv() {
super();
setResizable(false);
getContentPane().setBackground(new Color(225, 225, 225));
getContentPane().setLayout(null);
initialize();
}
protected void initialize() {
setTitle("系统登录");
l_Id.setBounds(48, 43, 53, 25);
t_Id.setBounds(110, 43, 150, 25);
l_pw.setBounds(48, 93, 53, 25);
t_pw.setBounds(110, 93, 150, 25);
getContentPane().add(l_Id);
getContentPane().add(l_pw);
getContentPane().add(t_Id);
getContentPane().add(t_pw);
btnLogin = new JButton();
btnLogin.setText("登录");
btnLogin.setBounds(70, 142, 85, 28);
btnLogin.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
addBtnLoginActionListener();
}
});
getContentPane().add(btnLogin);
btnClose = new JButton();
btnClose.setText("关闭");
btnClose.setBounds(175, 142, 85, 28);
btnClose.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
dispose();
System.exit(-1);
}
});
getContentPane().add(btnClose);
}
private void addBtnLoginActionListener() {
String user = t_Id.getText();
String password = new String(t_pw.getPassword());
if (user.equals("")) {
JOptionPane.showMessageDialog(this, "帐号不可为空", "Caution",
JOptionPane.WARNING_MESSAGE);
return;
}
if (password.equals("")) {
JOptionPane.showMessageDialog(this, "密码不可为空", "Caution",
JOptionPane.WARNING_MESSAGE);
return;
}
String sql = "select * FROM login WHERE id = '"user"' and pw = '"
password"'";
boolean success = false;
// TODO:数据校验 success = executeQuery(sql);
if (success) {
// TODOjava简单代码图片： 如果数据校验成功 显示主界面 并关闭登录界面
JOptionPane.showMessageDialog(this, "成功登录", "提示",
JOptionPane.INFORMATION_MESSAGE);
this.dispose();
} else {
JOptionPane.showMessageDialog(this, "帐号或密码错误!", "警告",
JOptionPane.WARNING_MESSAGE);
t_pw.requestFocus(); // 密码框选中
}
}
public Dimension getPreferredSize() {
return new Dimension(320, 170);
}
public void show() {
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension screen = tk.getScreenSize();
Dimension d = getSize();
this.setLocation((screen.width - d.width) / 2,
(screen.height - d.height) / 2);
// 输入密码后回车相当于点击java简单代码图片了登录按钮
getRootPane().setDefaultButton(btnLogin);
t_pw.requestFocus();
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setSize(300, 220);
super.show();
}
public static void main(String[] args) {
vv loginFrame = new vv();
loginFrame.setVisible(true);
}
}
希望对java简单代码图片你有帮助
java编程采用图形界面实现两个内容的交换,图形界面如下图以下是一个简单的Java GUI程序，可以实现两个内容（字符串、图片等）之间的交换：
Copy code
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SwapContent extends JFrame implements ActionListener {
private JLabel label1, label2;
private JButton swapBtn;
public SwapContent() {
// 设置窗口大小和标题
setSize(400, 300);
setTitle("Swap Content Demo");
// 创建标签和按钮
label1 = new JLabel("Content A");
label2 = new JLabel("Content B");
swapBtn = new JButton("Swap");
// 设置标签和按钮的位置和大小
label1.setBounds(50, 50, 100, 30);
label2.setBounds(200, 50, 100, 30);
swapBtn.setBounds(150, 150, 100, 30);
// 将标签和按钮添加到窗口中
add(label1);
add(label2);
add(swapBtn);
// 注册按钮的事件监听器
swapBtn.addActionListener(this);
// 设置窗口的默认关闭方式
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
@Override
public void actionPerformed(ActionEvent e) {
// 获取标签的内容
String temp = label1.getText();
label1.setText(label2.getText());
label2.setText(temp);
}
public static void main(String[] args) {
// 创建窗口对象并显示
SwapContent sc = new SwapContent();
sc.setVisible(true);
}
}
该程序创建了一个窗口，包括两个标签（label1和label2）和一个按钮（swapBtn） 。当用户点击按钮时 ， 程序会交换label1和label2的内容 。
在程序的actionPerformed方法中，程序将label1和label2的内容交换 。具体实现是，首先使用label1.getText()获取label1的内容 ， 并将其保存到一个临时变量temp中；然后，将label1的内容设置为label2的内容，将label2的内容设置为temp的值 。这样，label1和label2的内容就被互换了 。
在main方法中，程序创建了SwapContent对象，并将其显示出来 。程序运行后，用户可以在窗口中交换label1和label2的内容 。
JAVA用frame实现图中2个窗口 怎么写?。?/h2>图片看起来很模糊 ， 隐约看到需要一个登录窗口，那就分享一下以前练习的登录窗口demo吧 。
先上效果图：
登录界面
源码如下：
AbsoluteLoginFrame.java
public class AbsoluteLoginFrame extends JFrame {
private static final int LOGIN_WIDTH = 600;
private static final int LOGIN_HEIGHT = 400;
private static final long serialVersionUID = -2381351968820980500L;
public AbsoluteLoginFrame(){
//设置窗口标题
setTitle("登录界面");
//设置一个初始面板，填充整个窗口
JPanel loginPanel = new JPanel();
//设置背景颜色
loginPanel.setBackground(new Color(204, 204, 204));//#CCC
loginPanel.setLayout(null);
JPanel centerPanel = new JPanel();
centerPanel.setBackground(Color.WHITE);
centerPanel.setBounds(114, 70, 360, 224);
centerPanel.setLayout(null);
JLabel jLabel = new JLabel("用户名：");
jLabel.setOpaque(true);
jLabel.setBackground(Color.YELLOW);
jLabel.setBounds(60, 60, 54, 20);
JLabel label = new JLabel("密码：");
label.setOpaque(true);
label.setBackground(Color.CYAN);
label.setBounds(60, 90, 54, 20);
JTextField textField = new JTextField(15);
textField.setBounds(130, 60, 166, 21);
JPasswordField passwordField = new JPasswordField(15);
passwordField.setBounds(130, 90, 166, 21);
JButton jButton = new JButton("登录");
jButton.setBounds(148, 120, 62, 28);
centerPanel.add(jLabel);
centerPanel.add(label);
centerPanel.add(textField);
centerPanel.add(jButton);
centerPanel.add(passwordField);
loginPanel.add(centerPanel);
getContentPane().add(loginPanel);//将初始面板添加到窗口中
setSize(LOGIN_WIDTH, LOGIN_HEIGHT);//设置窗口大小
setLocation(Screen.getCenterPosition(LOGIN_WIDTH, LOGIN_HEIGHT));//设置窗口位置
setDefaultCloseOperation(EXIT_ON_CLOSE);//设置窗口默认关闭方式
setResizable(false);
setVisible(true);
}
public static void main(String[] args) {
new AbsoluteLoginFrame();
}
}
Screen.java
public class Screen {
private int width;
private int height;
public Screen(){
Toolkit toolkit = Toolkit.getDefaultToolkit();
Dimension screenSize = toolkit.getScreenSize();
this.width = screenSize.width;
this.height = screenSize.height;
}
public static Point getCenterPosition(int width, int height){
Screen screen = new Screen();
int x = (screen.getWidth() - width) / 2;
int y = (screen.getHeight() - height) / 2;
return new Point(x, y);
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
}
登录界面的java代码 ， 分别有教师登录，管理员登录，学生登录，右边是用户名和密码，见图 。分三个包，自己建个包，导进去就ok了，数据库是access的 。
package 登录;
import java.awt.EventQueue;
public class Cilent {
private JFrame frame;
private JTextField textField;
private JPasswordField passwordField;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Cilent window = new Cilent();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public Cilent() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setTitle("登陆界面");
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
frame.setResizable(false);
JLabel lblNewLabel = new JLabel("用户名");
lblNewLabel.setBounds(38, 43, 80, 34);
frame.getContentPane().add(lblNewLabel);
textField = new JTextField();
textField.setBounds(155, 42, 227, 37);
frame.getContentPane().add(textField);
textField.setColumns(10);
JLabel label = new JLabel("密　码");
label.setBounds(38, 115, 80, 34);
frame.getContentPane().add(label);
passwordField = new JPasswordField();
passwordField.setBounds(155, 115, 227, 37);
frame.getContentPane().add(passwordField);
JButton btnNewButton = new JButton("登　录");
btnNewButton.setBounds(60, 187, 115, 34);
frame.getContentPane().add(btnNewButton);
btnNewButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
UserCheck UC=new UserCheck(textField.getText(),String.valueOf(passwordField.getPassword()));
if(UC.getI()!=0)//有此用户
{
frame.setVisible(false);
}
else
{
textField.setText("");
passwordField.setText("");
}
}
});
JButton button = new JButton("取　消");
button.setBounds(242, 187, 115, 34);
frame.getContentPane().add(button);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
textField.setText("");
passwordField.setText("");
}
});
}
}
/*****************************************************************/
package 登录;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import 操作处理.UsersCL;
/**@author 20111024
* 检测登录的用户在数据库中有无，若没有，则提示没有此用户，
* 若有，则判断级别：普通用户还是管理员 。
*/
public class UserCheck {
private int i=0;//用户级别:0不是用户、1是管理员、2是普通用户
UserCheck(String name ,String password)
{
String jdriver="sun.jdbc.odbc.JdbcOdbcDriver";
String connectDB="jdbc:odbc:Students";
Statement stmt=null;
ResultSet rs=null;
Connection con=null;
try {
Class.forName(jdriver);
con=DriverManager.getConnection(connectDB);
stmt=con.createStatement();
String query="select * from users where name='" name "' and passwd='" password "'";
rs=stmt.executeQuery(query);
if(rs.next())
{
//数据库中有此用户，访问成功
i=Integer.parseInt(rs.getString(3));
UsersCL UL=new UsersCL(i);
}
else
{
i=0;//没有用户是默认是0级
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public int getI() {
return i;
}
}
/********************************************************************************************/
package 操作处理;
import java.awt.EventQueue;
public class UsersCL implements ActionListener{
private JFrame frame;
private JTextField textField;
private JTextField textField_1;
private JTextField textField_2;
private JTextField textField_3;
private int i=0;
private JLabel label_3;
private JTextField textField_4;
public UsersCL(int i) {
this.i=i;
frame = new JFrame();
frame.setTitle("用户处理界面");
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
frame.setResizable(false);
frame.setVisible(true);
JLabel lblNewLabel = new JLabel("学　号");
lblNewLabel.setBounds(24, 32, 74, 29);
frame.getContentPane().add(lblNewLabel);
JLabel label = new JLabel("姓　名");
label.setBounds(24, 71, 74, 29);
frame.getContentPane().add(label);
JLabel label_1 = new JLabel("年　龄");
label_1.setBounds(24, 110, 74, 29);
frame.getContentPane().add(label_1);
label_3 = new JLabel("性　别");
label_3.setBounds(24, 149, 74, 29);
frame.getContentPane().add(label_3);
JLabel label_2 = new JLabel("状　态");
label_2.setBounds(24, 195, 74, 29);
frame.getContentPane().add(label_2);
textField = new JTextField();
textField.setBounds(101, 34, 113, 25);
frame.getContentPane().add(textField);
textField.setColumns(10);
textField_1 = new JTextField();
textField_1.setColumns(10);
textField_1.setBounds(101, 73, 113, 25);
frame.getContentPane().add(textField_1);
textField_2 = new JTextField();
textField_2.setColumns(10);
textField_2.setBounds(101, 112, 113, 25);
frame.getContentPane().add(textField_2);
textField_3 = new JTextField();
textField_3.setEditable(false);
textField_3.setColumns(10);
textField_3.setBounds(101, 199, 288, 25);
frame.getContentPane().add(textField_3);
textField_4 = new JTextField();
textField_4.setColumns(10);
textField_4.setBounds(101, 149, 113, 25);
frame.getContentPane().add(textField_4);
if(1==i)
{
JButton btnNewButton = new JButton("追　加");
btnNewButton.setBounds(276, 41, 113, 29);
frame.getContentPane().add(btnNewButton);
btnNewButton.addActionListener(this);
btnNewButton.setActionCommand("追加");
JButton button_1 = new JButton("删　除");
button_1.setBounds(276, 145, 113, 29);
frame.getContentPane().add(button_1);
button_1.addActionListener(this);
button_1.setActionCommand("删除");
}
JButton button = new JButton("查　询");
button.setBounds(276, 91, 113, 29);
frame.getContentPane().add(button);
button.addActionListener(this);
button.setActionCommand("查询");
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
String name,age,sex,query=null;
int num,age1,count=0;
num=Integer.parseInt(textField.getText());
name=textField_1.getText();
age1=Integer.parseInt(textField_2.getText());
sex=textField_4.getText();
if(e.getActionCommand().equals("追加"))
{
query="insert into students values(" num "," "'" name "'," age1 ",'" sex "');";
count=1;
}
else if(e.getActionCommand().equals("查询"))
{
query="select * from students where XSB=" num ";";
count=2;
}
else if(e.getActionCommand().equals("删除"))
{
query="delete from students where XSB=" num " and name=" "'" name "'";
count=3;
}
Statement stmt=null;
ResultSet rs=null;
Connection con=null;
String jdriver="sun.jdbc.odbc.JdbcOdbcDriver";
【java简单代码图片 java图形代码大全】String connectDB="jdbc:odbc:Students";
String query1=null;
try {
Class.forName(jdriver);
con=DriverManager.getConnection(connectDB);
stmt=con.createStatement();
if(count==1)
{
query1="select * from students where XSB=" num ";";
rs=stmt.executeQuery(query1);
if(rs.next())
textField_3.setText("已经由此记录，不能追加！");
else
{
stmt.executeUpdate(query);
textField_3.setText("已经追加完成！");
}
}
else if(2==count)
{
stmt.executeQuery(query);
rs=stmt.executeQuery(query);
if(rs.next())
{
textField_3.setText("已查找到此记录！");
}
else
{
textField_3.setText("没有此记录，可以追加！");
}
}
else if(3==count)
{
query1="select * from students where XSB=" num " and name=" "'" name "'";
rs=stmt.executeQuery(query1);
if(rs.next())
{
stmt.executeUpdate(query);
textField_3.setText("已删除此记录！");
}
else
textField_3.setText("无此记录！");
}
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
finally{
//关闭资源
if(stmt!=null){
try {
stmt.close();
} catch (Exception e2) {
// TODO: handle exception
}
stmt=null;
}
if(con!=null){
try {
con.close();
} catch (Exception e2) {
// TODO: handle exception
}
con=null;
}
}
}
}
java如何实现图片充满整个窗体 。。如：下面的图片就是一个窗体，没有标题栏，最大，最小化下边是代码，你试一下吧，
和上面说的差不多
----------------------------------------------------
import java.awt.Graphics;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class ImageApp extends JFrame {
public ImageApp() {
getContentPane().add(new MyPanel());
setResizable(false);
setUndecorated(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setSize(400, 300);
setVisible(true);
}
public static void main(String[] args) {
new ImageApp();
}
}
class MyPanel extends JPanel {
public void paint(Graphics g) {
super.paint(g);
ImageIcon image = new ImageIcon("D:\\1.jpg");
g.drawImage(image.getImage(), 0, 0, 400, 300, this);
}
}
帮我看一下，我的java代码 。为什么运行结果不对！如图：请详解，为什么其他组件没有显示？看注释：
import java.awt.GridLayout;
import javax.swing.*;
public class LoadForm extends JFrame{
private JPanel jpanel1;
private JTextField jtext1;
private JPasswordField password;
private JLabel jlable1;
private JLabel jlable2;
private JButton button1;
private JButton button2;
public LoadForm()
{
super("商品管理系统");
this.setLayout(null);
GridLayout layout=new GridLayout(3,3,10,10);//这句保留
jpanel1=new JPanel();
//jpanel1.setLayout(null);//jpanel1的布局不能为空
jlable1=new JLabel("用户名");
jlable2=new JLabel("密码");
jtext1=new JTextField();
password=new JPasswordField();
button1=new JButton("确定");
button2=new JButton("取消");
jpanel1.add(jlable1);
jpanel1.add(jtext1);
jpanel1.add(jlable2);
jpanel1.add(password);
jpanel1.add(button1);
jpanel1.add(button2);
//this.add(jpanel1);//写法错误
this.setContentPane(jpanel1);//设置jpanel1为Frame的内容面版
this.setBounds(200,200,100,100);
//this.setSize(200,200);
this.setVisible(true);
}
//main方法测试
public static void main(String args[]){
new LoadForm();
}
}
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