窗口生成代码java java窗口编程

java中怎样指定生成的窗口位置？ 给个示例代码 谢~~~

JFrame frame = new JFrame(“窗口位置”);

frame.setLocation(x,y);

frame.setVisible(true);

给你一个窗口永远初始化显示在屏幕中间的例子

package FileChooser;

import java.awt.BorderLayout;

import java.awt.Dimension;

import java.awt.FlowLayout;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.PrintWriter;

import javax.swing.JButton;

import javax.swing.JFileChooser;

import javax.swing.JFrame;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;

public class FileChooserDemo extends JPanel {

JFileChooser fileChooser;

JButton open;

JButton save;

JTextArea textArea;

public static void main(String[] args){

JFrame frame = new JFrame("FileChooser");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setContentPane(new FileChooserDemo());

frame.pack();

Dimension size = Toolkit.getDefaultToolkit().getScreenSize();

frame.setLocation((int)(size.getWidth()-frame.getWidth())/2,

(int)(size.getHeight()-frame.getHeight())/2);

frame.setVisible(true);

}

FileChooserDemo(){

fileChooser = new JFileChooser();

fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);

open = new JButton("Open");

save = new JButton("Save");

this.setLayout(new BorderLayout());

JPanel buttonPane = new JPanel(new FlowLayout(FlowLayout.CENTER,5,5));

buttonPane.add(open);

buttonPane.add(save);

textArea = new JTextArea(15,40);

this.add(new JScrollPane(textArea),BorderLayout.CENTER);

this.add(buttonPane,BorderLayout.SOUTH);

open.addActionListener(new ButtonAction());

save.addActionListener(new ButtonAction());

}

class ButtonAction implements ActionListener {

public void actionPerformed(ActionEvent e){

if(e.getSource() == open)

openFile();

if(e.getSource() == save)

saveFile();

}

public void openFile(){

int result = fileChooser.showOpenDialog(null);

if(result == JFileChooser.APPROVE_OPTION){

try{

File file = fileChooser.getSelectedFile();

BufferedReader input = new BufferedReader(new FileReader(file));

String line = input.readLine();

while(line != null){

textArea.append(line + "\n");

line = input.readLine();

}

input.close();

}catch(IOException ioe){

JOptionPane.showMessageDialog(null,ioe.toString());

}

}

}

public void saveFile(){

int result = fileChooser.showSaveDialog(null);

if(result == JFileChooser.APPROVE_OPTION){

try{

File file = fileChooser.getSelectedFile();

PrintWriter output = new PrintWriter(new FileWriter(file));

output.print(textArea.getText());

output.close();

}catch(IOException ioe){

JOptionPane.showMessageDialog(null, ioe.toString());

}

}

}

}

}

相关问答

Q1: JAVA用frame实现图中2个窗口 怎么写啊？

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;

  }

}

Q2: 用java做一个窗口

java做窗口窗口生成代码java的话窗口生成代码java，需要用swing技术窗口生成代码java，之后创建JFrame 等组件，即可完成窗口创建工作。

package inter.frame;import java.awt.BorderLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;import javax.swing.JFrame;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

import javax.swing.JOptionPane;public class MenuTest { /**

* @param args

*/

JFrame frame; //定义一个窗口架构

JMenuBar mb;//定义窗口的菜单工具栏

JMenu m; //定义菜单

JMenuItem mi1;//定义菜单的内容

JMenuItem mi2; //定义菜单的内容

public MenuTest() {

initFrame();

initAction();

}

public void initFrame() {

frame = new JFrame();

mb = new JMenuBar();

m = new JMenu("学生查询");

mi1 = new JMenuItem("确认");

mi2 = new JMenuItem("取消"); m.add(mi1);

m.add(mi2);

mb.add(m);

frame.add(mb, BorderLayout.NORTH);

frame.setSize(300, 300); //设置窗口大小

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置退出时关闭窗口

frame.setVisible(true);//设置窗口可见

} public void initAction() {

mi1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

// 具体实现代码根据实际要求填写

System.out.println("click");

JOptionPane.showMessageDialog(null, "你点击了确定按钮");

}

});

mi2.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

// 具体实现代码根据实际要求填写

JOptionPane.showMessageDialog(null, "你点击了取消按钮");

}

});

} public static void main(String[] args) {

new MenuTest();//执行菜单创建

}}

Q3: 编程：java，生成窗口，包括用户名，密码

import java.awt.Container;

import java.awt.FlowLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JTextField;

public class Test extends JFrame{

public Test() {

Container c = this.getContentPane();

c.setLayout(new FlowLayout(FlowLayout.CENTER));

JLabel l1 = new JLabel("用户名："), l2 = new JLabel("密 码：");

JTextField t1 = new JTextField(8), t2 = new JTextField(8);

JButton b1 = new JButton("登陆"), b2 = new JButton("取消");

c.add(l1);

c.add(t1);

c.add(l2);

c.add(t2);

c.add(b1);

c.add(b2);

this.setBounds(300, 200, 200, 150);

this.setVisible(true);

}

public static void main(String[] args) {

new Test();

}

}

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