1 package project; 2 import javax.swing.*; 3 import java.awt.*; 4 public class test 5 { 6   public static void main(String args[]) 7   { 8       JFrame window1 , window2; 9       window1 =  new JFrame("第一个");10       window2 =  new JFrame("第二个");11       Container con = window1.getContentPane();  //得到当前画板12       con.setBackground(Color.blue);  //设置背景颜色13       window1.setBounds(30, 40, 70, 60);14       window2.setBounds(60, 90, 70, 60);15       window1.setVisible(true);  //窗口是否可见16       window1.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);  //注销释放掉这个窗口17       window2.setVisible(true); 18       window2.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);19       20       21   }22 }

JFrame类的一些基本用法.