java输入框的代码 java里输入
java中点击一个按钮弹出两个输入文本框的源代码
写了一个很简单的案例,可以参考和修改
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import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class FromeDemo extends JFrame{
JButton jbutton;
public FromeDemo() {
jbutton = new JButton("弹出2个文本框");
jbutton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JDialog jd = new JDialog();
jd.setBounds(320, 180, 260, 100);
jd.setTitle("弹出文本框");
jd.getContentPane().setLayout(new GridLayout(2, 2));
jd.add(new JLabel("文本框一"));
jd.add(new JTextField(80));
jd.add(new JLabel("文本框二"));
jd.add(new JTextField(80));
jd.setModal(true);//确保弹出的窗口在其他窗口前面
jd.setVisible(true);
}
});
add(jbutton,BorderLayout.SOUTH);
setBounds(300, 100, 320, 320);
setTitle("测试");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String args[]) {
new FromeDemo();
}
}
想设计一个java小程序，在文本框输入一个数，然后每一秒＋1，求给完整代码
package com.demo;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;
public class TimerTest {
private Timer timer;
private JTextField field;
private JButton button;
private boolean flag = true;
public TimerTest() {
timer = new Timer();
addview();
}
private void addview() {
JFrame frame = new JFrame("Timer test");
field = new JTextField();
field.setPreferredSize(new Dimension(0, 30));
button = new JButton("start");
button.setPreferredSize(new Dimension(100, 30));
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (flag) {
auto();
flag = false;
button.setText("stop");
} else {
timer.cancel();
flag = true;
button.setText("start");
}
}
});
frame.add(field, BorderLayout.CENTER);
frame.add(button, BorderLayout.EAST);
frame.setBounds(200, 200, 300, 60);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new TimerTest();
}
private void auto() {
timer.schedule(new TimerTask() {
@Override
public void run() {
int num = Integer.parseInt(field.getText().trim());
num += 1;
field.setText(num + "");
auto();
}
}, 1000);
}
}
JAVA一个窗体添加三个文本框具体怎么操作？
只要文本框添加监听即可，用ActionListener即会在文本框中按下回车键时触发事件。
下面是监听的代码：
public void actionPerformed(ActionEvent e)
{
Object o=e.getSource();
if(o==text1) //文本框一号
{
text2.requestFocus();//文本框2号，请求焦点
}
else if(o==text2)
{
text3.requestFocus();
}
}
程序如下：
import java.awt.FlowLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class MyFrame extends JFrame implements ActionListener
{
private JButton button;
private JTextField textField;
private JLabel label;
public MyFrame()
{
button = new JButton("Hello world");
textField = new JTextField(15);
label = new JLabel("输入内容：");
setTitle("Simple-Frame");
setBounds((Toolkit.getDefaultToolkit().getScreenSize().width - 500)/2,
(Toolkit.getDefaultToolkit().getScreenSize().height - 300)/2
, 500, 300);
setLayout(new FlowLayout());
add(label);
add(textField);
add(button);
setResizable(false);
setVisible(true);
this.button.addActionListener(this);
}
public static void main(String[] args)
{
new MyFrame();
}
@Override
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == this.button)
{
this.textField.setText("Hello World");
}
}
}
怎么用java代码实现将文本框输入的内容按照设计的排版格式
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;
public class Ttex {
BufferedImage bi = new BufferedImage(300, 200, BufferedImage.TYPE_INT_RGB);
public Ttex(String text) {
Graphics gr = bi.createGraphics();
gr.setColor(Color.white);
gr.fillRect(0, 0, bi.getWidth(), bi.getHeight());
gr.setColor(Color.GRAY);
gr.drawString(text, 10, 10);
}
/**
* 根据地址来保存文件
*
* @param dir
* 文件地址
*/
private void Save(String dir) {
BufferedImage image = bi;
// 得到系统支持的图片写入器
Iterator it = ImageIO.getImageWritersBySuffix("jpg");
ImageWriter iw = null;
if (it.hasNext()) {
try {
ImageOutputStream imgOut = ImageIO
.createImageOutputStream(new File(dir));
iw = (ImageWriter) it.next();
iw.setOutput(imgOut);
IIOImage iioi = new IIOImage(image, null, null);
iw.write(iioi);
imgOut.close();
iw.dispose();
} catch (IOException e1) {
}
}
}
public static void main(String[] args) {
Ttex m = new Ttex("0123456789");
m.Save("D:/1.jpg");
}
}
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