Java编程获取文本框的内容实例解析

import java.io.*;import javax.swing.*;import java.awt.FlowLayout;import java.awt.event.*;public class WriterTo extends JFrame implements ActionListener{	JButton b;JTextField t;	public WriterTo(){		super("文本框内容写入文件");		JLabel l=new JLabel("请输入内容：");		t=new JTextField(20);		b=new JButton("写入");		b.addActionListener(this);		this.add(l);		this.add(t);		this.add(b);		this.setLayout(new FlowLayout());		this.pack();		this.setVisible(true);	} public void actionPerformed(ActionEvent e) {	 if(e.getSource()==b){		 if(t.getText().equals("")){			 JOptionPane.showMessageDialog(null,"请输入内容~","错误",JOptionPane.ERROR_MESSAGE);			 t.grabFocus();		 }else{			 write(t.getText());			 JOptionPane.showMessageDialog(null,"写入成功","提示",JOptionPane.INFORMATION_MESSAGE);		 }	 } } 	public void write(String line){ 		try{ 			File f=new File("C://Users//Administrator//Desktop//java//就是这里.txt");//向指定文本框内写入 			FileWriter fw=new FileWriter(f); 			fw.write(line); 			fw.close(); 		}catch(Exception e){ 		} 	} 	public static void main(String[] args) { 		new WriterTo(); 	}}