JAVA 文本框JTextField

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;

class text2 extends JFrame{
	
	public text2() {
		// TODO Auto-generated constructor stub
		setBounds(400, 300, 250, 130);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		
		Container container = getContentPane();
		container.setLayout(new FlowLayout());
		
		//初始化文本框长度
		JTextField jTextField = new JTextField(20);
		
//		JTextField jTextField = new JTextField();
//		jTextField.setColumns(20);
		
		//初始化内容
		jTextField.setText("aaa");
//		JTextField jTextField = new JTextField("aaa");
		
		
		jTextField.setFont(new Font("黑体", Font.BOLD, 20));//设置字体
		container.add(jTextField);
		
		JButton jButton =  new JButton("确认");
		container.add(jButton);
		//添加监听
		jButton.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				System.out.println(jTextField.getText());//获取文本框内容并输出
				jTextField.setText("");//情况文本框长度
				jTextField.requestFocus();//获取光标
			}
		});
		
		setVisible(true);
	}
	
	public static void main(String[] args) {
		
		new text2();
	}
	
}