java图形界面的代码,java图形化界面代码

java图形界面代码

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import javax.swing.*;

public class ReadBook extends JFrame {

JTextArea jta;

JTextField jtf;

JButton jb;

public ReadBook() {

jta = new JTextArea();

jtf = new JTextField(30);

jtf.setText("文件保存路径如c:\\ab.txt");

jb = new JButton("保存文字");

JPanel jp = new JPanel();

jp.add(jtf);

jp.add(jb);

add(jta);

add(jp, BorderLayout.SOUTH);

setBounds(500, 100, 500, 380);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setVisible(true);

jb.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

//-------------核心代码---------

String path = jtf.getText();

File f = new File(path);

String txt = jta.getText().replaceAll("\n", "\r\n");

try {

BufferedWriter bw = new BufferedWriter(new FileWriter(f));

bw.write(txt);//写入文件中

bw.close();

} catch (Exception e1) {

e1.printStackTrace();

}

//-------------核心代码---------

}

});

}

public static void main(String[] args) {

new ReadBook();

}

}

相关问答

Q1: java图形界面编程

//这是哪个背景类

import java.awt.Image;

import java.awt.*;

import javax.swing.*;

public class ImageBack extends JPanel{

Image im = null;

public imageback(Image im){

this.im=im;

int width = Toolkit.getDefaultToolkit().getScreenSize().width;

int height = Toolkit.getDefaultToolkit().getScreenSize().height;

this.setSize(width,height);

this.setVisible(true);

}

public static void main(String args[]){

}

public void paintComponent(Graphics g){

//清屏

super.paintComponent(g);

g.drawImage(im, 0, 0, this.getWidth(),this.getHeight(),this);

}

}

import javax.swing.*;

import java.io.File;

import java.io.IOException;

import java.net.*;

/**

* 学生管理系统主界面

*/

public class StuMain extends JFrame{

//背景图片

Image image=null;

public StuMain() {

try {

image = ImageIO.read(new File("images/start.jpg"));

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

//把你要的背景图片放到背景面板里

imageback im = new imageback(image);

//把有背景的图片的JPanel放到JFrame里面

this.add(im);

//添加框架的关闭事件处理

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.pack();

//设置框架的大小

//设置标题

this.setTitle("学生管理系统");

this.setVisible(true);

}

public static void main(String args[]){

new StuMain();

}

}

如果那不懂随时米我 qq896182794

Q2: Java编写图形用户界面程序

运行如图

参考代码如下

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class RegDemo extends JFrame implements ActionListener{

JTextField jtf;

JPasswordField jpf;

public RegDemo() {

        //组件的创建, 和布局安排

JPanel jpc = new JPanel();//默认流式布局

JPanel jp1 = new JPanel(new GridLayout(2, 2,5,10));//网格布局

jp1.setBorder(BorderFactory.createTitledBorder("用户注册"));

JLabel jl1 = new JLabel("用户名:");

jtf = new JTextField(10);

JLabel jl2 = new JLabel("密码:");

jpf = new JPasswordField(10);

                jpf.setEchoChar('*');//用*号来隐藏密码的显示

jp1.add(jl1);jp1.add(jtf);

jp1.add(jl2);jp1.add(jpf);

jpc.add(jp1);

add(jpc);

JButton jb1 = new JButton("提交");

jb1.addActionListener(this);

jb1.setActionCommand("yes");

JButton jb2 = new JButton("取消");

jb2.addActionListener(this);

jb2.setActionCommand("no");

JPanel jp2 = new JPanel();

jp2.add(jb1);jp2.add(jb2);

add(jp2,BorderLayout.SOUTH);

setTitle("用户注册界面");

        setSize(280, 280);

        setLocationRelativeTo(null);//窗口居中

        setDefaultCloseOperation(EXIT_ON_CLOSE);//

        setVisible(true);

}

public static void main(String[] args) {

new RegDemo();

}

@Override

public void actionPerformed(ActionEvent e) {

if(e.getActionCommand().equals("yes")){

String name  = jtf.getText().trim();

String pwd = new String(jpf.getPassword());

if(name.equals("")||pwd.equals("")){

JOptionPane.showMessageDialog(this, "你还没有输入用户名或者密码");

}else{

JOptionPane.showMessageDialog(this, "注册成功!用户名"+name+",密码"+pwd);

}

}else{

jtf.setText("");

jpf.setText("");

}

}

}

Q3: java编写一个图形界面程序

import java.awt.*;

import java.awt.event.*;

import java.util.*;

import javax.swing.*;

import javax.swing.border.Border;

class MainFrame extends JFrame {

private static final long serialVersionUID = 1L;

private MapString, Integer sizes = new HashMapString, Integer();

private MapString, Integer styles = new HashMapString, Integer();

private MapString, Integer toppings = new HashMapString, Integer();

public MainFrame() {

sizes.put("Extra Large", 10);

sizes.put("Large", 8);

sizes.put("Medium", 5);

sizes.put("Small", 3);

styles.put("Deep Dish", 20);

styles.put("Regular", 10);

styles.put("Thin Crust", 5);

styles.put("Chicago", 3);

toppings.put("Cheese", 8);

toppings.put("Tomato", 7);

toppings.put("Peppers", 6);

toppings.put("Peperoni", 5);

this.setTitle("布局及事件处理");

this.setSize(450, 350);

this.setLayout(new BorderLayout());

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JLabel lblTitle = new JLabel();

lblTitle.setText("Pizzeria Juno");

lblTitle.setFont(new Font("宋体", Font.BOLD, 36));

lblTitle.setHorizontalAlignment(SwingConstants.CENTER);

this.add("North", lblTitle);

JPanel bodyPanel = new JPanel();

bodyPanel.setLayout(new GridLayout(2, 1));

this.add("Center", bodyPanel);

JPanel listPanel = new JPanel();

listPanel.setLayout(new GridLayout(1, 3));

listPanel.setSize(200, 200);

bodyPanel.add(listPanel);

Border lineBorder = BorderFactory.createLineBorder(Color.BLACK);

JPanel sizePanel = new JPanel();

sizePanel.setLayout(new BorderLayout());

listPanel.add(sizePanel);

JLabel sizeTitle = new JLabel();

sizeTitle.setText("Sizes");

sizePanel.add("North", sizeTitle);

JList sizeList = new JList(sizes.keySet().toArray());

sizeList.setSize(100, 100);

sizeList.setBorder(lineBorder);

sizeList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

sizePanel.add(sizeList);

JPanel stylePanel = new JPanel();

stylePanel.setLayout(new BorderLayout());

listPanel.add(stylePanel);

JLabel styleTitle = new JLabel();

styleTitle.setText("Styles");

stylePanel.add("North", styleTitle);

JList styleList = new JList(styles.keySet().toArray());

styleList.setSize(100, 100);

styleList.setBorder(lineBorder);

styleList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

stylePanel.add(styleList);

JPanel toppingPanel = new JPanel();

toppingPanel.setLayout(new BorderLayout());

listPanel.add(toppingPanel);

JLabel toppingTitle = new JLabel();

toppingTitle.setText("Toppings");

toppingPanel.add("North", toppingTitle);

JList toppingList = new JList(toppings.keySet().toArray());

toppingList.setSize(100, 100);

toppingList.setBorder(lineBorder);

toppingPanel.add(toppingList);

JTextArea txtResult = new JTextArea();

txtResult.setEditable(false);

bodyPanel.add(txtResult);

JPanel bottomPanel = new JPanel();

bottomPanel.setLayout(new GridLayout(1, 3));

this.add("South", bottomPanel);

JLabel label1 = new JLabel("Click to complete order");

bottomPanel.add(label1);

JButton btnRingUp = new JButton("Ring up");

btnRingUp.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

if(sizeList.getSelectedValue() == null) {

JOptionPane.showMessageDialog(MainFrame.this, "Please select size.");

return;

}

if(styleList.getSelectedValue() == null) {

JOptionPane.showMessageDialog(MainFrame.this, "Please select style.");

return;

}

if(toppingList.getSelectedValue() == null) {

JOptionPane.showMessageDialog(MainFrame.this, "Please select topping.");

return;

}

float total = 0;

String size = sizeList.getSelectedValue().toString();

total += sizes.get(size);

String style = styleList.getSelectedValue().toString();

total += styles.get(style);

String result = size + " Pizza, " + style + " Style";

Object[] toppings = toppingList.getSelectedValues();

for(Object topping : toppings) {

result += "\n  +" + topping.toString();

total += MainFrame.this.toppings.get(topping.toString());

}

result += "\n  Total: " + total;

txtResult.setText(result);

}

});

bottomPanel.add(btnRingUp);

JButton btnQuit = new JButton("Quit");

btnQuit.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

MainFrame.this.dispose();

}

});

bottomPanel.add(btnQuit);

}

}

public class App {

public static void main(String[] args) {

MainFrame mainFrame = new MainFrame();

mainFrame.setVisible(true);

}

}

Q4: 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) {

// TODO： 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);

}

}

希望对你有帮助