import java.awt.*;import javax.swing.*;public class JFrameTest{JFrameTest jFrame;JButton jButton;public JFrameTest(){jFrame=new JFrame("Testing JFrame"); //創(chuàng)建JFrame對(duì)象Container contentPane=jFrame.getContentPane(); //獲取類容面板contentPane.setLayout(new FlowLayout()); //設(shè)置布局jButton=new JButton("This is JFrame Dmeo!"); //創(chuàng)建JButton對(duì)象contentPane.add(jButton); //將按鈕jButton添加到類容面板//設(shè)置窗體jFrame的一些屬性jFrame.setDefaultCloseOperation(JFrame.EXLT_ON_CLOSE);jFrame.setSize(300,200); //設(shè)置窗口大小jFrame.setLocationRelativeTo(null);jFrame.setVisible(true);}}public class MainClass //啟動(dòng)程序{public static void main (String[] args){JFrameTest jframedemo=new JFrameTest(); //創(chuàng)建窗口對(duì)象}}