窗体dsdad

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.JOptionPane;
import javax.swing.JTextField;

public class gui extends Jframe{
    JButton button=new JButton("按钮");
    JTextField textField1=new JTextField("1");
    JLabel label=new JLabel("");
    public gui(){
        setTitle("计算最大公约数");
        setSize(300,300);
        setLocation(400,400);
        setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);
        setLayout(null);
        button.setSize(100,100);
        button.setLocation(20,100);
        textField1.setBounds(20,50,100,50);
        add(textField1);
        add(button);
        button.addActionListener((ActionListener) new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                textField1.setText("Hello world");
                
            }

        });
    }

public static void main(String[] args) {
    
gui frameSsss=new gui();
frameSsss.setVisible(true);
}
}