图形界面 ----JButton

1. JButton是一个普通的按钮，直接使用此类就可以增加一个按钮。可以设置快捷键。setMnemonic();还以设置成图片按钮

   package GUI;
   
   import java.awt.FlowLayout;
   import java.io.File;
   
   import javax.swing.Icon;
   import javax.swing.ImageIcon;
   import javax.swing.JButton;
   import javax.swing.JFrame;
   
   public class JButtonDemo01 {
   public static void main(String[] args){
   JFrame j = new JFrame();
   j.setLayout(new FlowLayout());
   JButton jb1 = new JButton("kick me");
   
   String picPath = "F:"+File.separator+"123.jpg";
   
   Icon icon = new ImageIcon(picPath);
   JButton jb2 = new JButton(icon);
   
   j.add(jb1);
   j.add(jb2);
   
   j.setSize(300, 300);
   j.setLocation(300, 300);
   
   j.setVisible(true);
   }
   }