GUI layout: Boundary layout, flow layout, grid layout, card layout

Boundary layout

Package Guitest;//jframe default is the boundary layout borderlayoutimport Java.awt.borderlayout;import Javax.swing.jbutton;import Javax.swing.jframe;public class Borderlayoutdemo {public static void main (string[] args) {JFrame f = new JFrame ("Boundary layout Borde Rlayout ");//jframe default LayoutManager is Borderlayout//f.setlayout (new BorderLayout ());//Can not write, the default is flow layout JButton btn =  New JButton ("North"); F.add (Btn,borderlayout.north); Btn=new JButton ("South"); F.add (Btn,borderlayout.south); btn=new JButton ("East"); F.add (btn,borderlayout.east); Btn=new JButton ("West"); F.add (btn,borderlayout.west); Btn=new JButton ("Medium") ; F.add (Btn,borderlayout.center); F.pack ();//can also be set with F.setsize (222,222); f.setvisible (true); F.setdefaultcloseoperation (Jframe.exit_on_close);}}

Flow layout

Package Guitest;import Java.awt.borderlayout;import Java.awt.cardlayout;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.jpanel;public class Cardlayoutdemo {private static JPanel p;public static void Main (string[] args) {JFr Ame f = new JFrame ("card layout cardlayout");p =new JPanel ();//set P layout Manager for card layout cardlayoutp.setlayout (New CardLayout ());// New two Jpaneljpanel p1 = new JPanel (); JPanel P2 = new JPanel (); JLabel lb = new JLabel ("first panel");p 1.add (LB),///panel with label Lb=new JLabel ("second panel");p 2.add (lb);//Panel with tag// Add the newly created two JPanel panels to P p.add (P1, "first");p. Add (P2, "second"), or//set to display the JPanel P1 ((cardlayout) p.getlayout () corresponding to first for first. Show (P, "first"); JButton btn = new JButton ("Change panel"), Btn.addactionlistener (new ActionListener () {@Overridepublic void actionperformed ( ActionEvent e) {//TODO auto-generated method stub//When you click ' Change Panel ', the second corresponding JPanel P2 ((cardlayout) p.getlayout ()) is displayed. Show (P , "Second");}); F.add (Btn,borderLayout.north); F.add (P,borderlayout.center); f.setsize (400,150);//f.pack (); f.setvisible (true); F.setdefaultcloseoperation (Jframe.exit_on_close);}}

Grid layout

Package Guitest;import Java.awt.flowlayout;import Javax.swing.jbutton;import Javax.swing.jframe;public class Flowlayoutdemo {public static void main (string[] args) {//TODO auto-generated method Stubjframe f = new JFrame ("Streaming layout flowl Ayout "), F.setlayout (New FlowLayout ()), for (int i=0;i<7;i++) {JButton btn=new JButton (" button "+i); F.add (BTN);} F.setsize (300,250);//f.pack (); default border set width and length just like f.setvisible (true); F.setdefaultcloseoperation (Jframe.exit_on_ CLOSE);}}

Card layout

Package Guitest;import Java.awt.gridlayout;import Javax.swing.jbutton;import Javax.swing.jframe;public class Girdlayoutdemo {public static void main (string[] args) {JFrame f = new JFrame ("Grid layout girdlayout");// Set the layout manager for F to 3 rows of 3 columns with horizontal and vertical spacing between girdlayout components 5f.setlayout (new GridLayout (3,3,5,5)), and for (int i=1;i<10;++i) {JButton btn = New JButton (string.valueof (i)); F.add (BTN);} F.pack (); f.setvisible (true); F.setdefaultcloseoperation (Jframe.exit_on_close);}}

GUI layout: Boundary layout, flow layout, grid layout, card layout