Java learning-AWT layout component

Java learning-AWT layout component

Take note of several window components in the form program developed by AWT in java.

 

FlowLayout:

 

Import java. awt. *; public class Wintwo2 extends Frame {// defines a text box. TextArea a = new TextArea ("please fill in the information accurately"); // define three button components. Button b1 = new Button ("Submit"); Button b2 = new Button ("cancel"); Button b3 = new Button ("reset"); Wintwo2 () {// set the window name. This. setTitle ("survey information card"); // set the layout manager to FlowLayout. This. setLayout (new FlowLayout (); // place the button component in the window. this. add (a); this. add (b1); this. add (b2); this. add (b3); // set the position and size of the window. this. setBounds (100,100,450,350); // set window visibility this. setVisible (true);} public static void main (String [] args) {// TODO Auto-generated method stubnew Wintwo2 ();}}

 

BorderLayout:

 

Import java. awt. *; import java. awt. peer. textAreaPeer; public class Winthree1 extends Frame {// defines the five button components TextArea b1 = new TextArea ("medium"); TextArea b2 = new TextArea ("South "); button b3 = new Button ("Submit"); Button b4 = new Button ("cancel"); Button b5 = new Button ("reset"); Winthree1 () {// set the window name this. setTitle ("tool BorderLayout"); // you can specify the layout manager BorderLayoutthis. setLayout (new BorderLayout (); // place the button component in the specified position in the window. this. add (b1, BorderLayout. CENTER); this. add (b2, BorderLayout. NORTH); this. add (b3, BorderLayout. SOUTH); this. add (b4, BorderLayout. WEST); this. add (b5, BorderLayout. EAST); // set the window position and size this. setBounds (300,200,450,350); // set window visibility this. setVisible (true);} public static void main (String [] args) {// TODO Auto-generated method stubnew Winthree1 ();}}

 

 

GridLayout:

 

Import java. awt. *; public class Winfour2 extends Frame {TextArea b1 = new TextArea ("A"); TextArea b2 = new TextArea ("B "); button b3 = new Button ("C"); Button b4 = new Button ("ding"); Button b5 = new Button ("e"); Winfour2 () {this. setTitle ("Girdlayout layout"); this. setLayout (new GridLayout (2, 3); this. add (b1); this. add (b2); this. add (b3); this. add (b4); this. add (b5); this. setBounds (100,100,450,450); this. setVisible (true);} public static void main (String [] args) {// TODO Auto-generated method stubnew Winfour2 ();}}

 

 

CardLayout:

 

Import java. awt. *; import java. awt. event. *; public class Winfive1 extends Frame implements ActionListener {// define a Panel p = new Panel (); // define five buttons: Button bf = new Button ("first"); Button bl = new Button ("last "); button bn = new Button ("Next"); Button bp = new Button ("last"); Button bg = new Button ("Search "); // define a single row text box TextField tf = new TextField (); // set the layout manager CardLayout cl = new CardLayout (); Winfive1 () {// set the window name this. setTitle ("using CardLayout layout component"); this. setBackground (Color. blue); this. setResizable (false); this. setLayout (null); this. add (p); // define the p Panel as the cardlayout layout manager p. setLayout (cl); // Add a component for the cardlayout layout manager for (int I = 1; I <= 3; I ++) {Button btemp = new Button ("layout Button" + I); p. add (btemp, "" + I);} // set the size position for each component and add it to the container. setBounds (10, 40,100,100); this. add (bf); bf. addActionListener (this); bf. setBounds (120, 40, 60, 20); this. add (bl); bl. addActionListener (this); bl. setBounds (120, 70, 60, 20); this. add (bn); bn. addActionListener (this); bn. setBounds (120,100, 60, 20); this. add (bp); bp. addActionListener (this); bp. setBounds (120,130, 60, 20); this. add (bg); bg. addActionListener (this); bg. setBounds (60,160, 40, 20); this. add (tf); tf. setBounds (20,160, 40, 20); // you can specify the position and size of the window. setBounds (200,200,400,380); // set the window visibility this. setVisible (true);} // implement the actionreceivmed method public void actionreceivmed (java. awt. event. actionEvent e) {// next method if (e. getSource () = bn) {cl. next (p);} // previous method if (e. getSource () = bp) {cl. previous (p);} // first method if (e. getSource () = bf) {cl. first (p);} // last method if (e. getSource () = bl) {cl. last (p);} // show method if (e. getSource () = bg) {cl. show (p, tf. getText (). trim (); tf. setText ("") ;}} public static void main (String [] args) {// TODO Auto-generated method stubnew Winfive1 ();}}

 

 

Null:

 

Import java. awt. *; import java. awt. event. *; public class Winnull2 extends Frame {// defines three buttons: Button b1 = new Button ("A"); Button b2 = new Button ("B "); button b3 = new Button (""); public Winnull2 () {// set the window name this. setTitle ("null layout"); // sets the null layout manager this. setLayout (null); // Add the component to the container this. add (b1); this. add (b2); this. add (b3); // set the component size and position b1.setBounds (50, 50,100, 50); b2.setBounds (50,120,100, 50); b3.setBounds (50,190,100, 50 ); // set the window position and size this. setBounds (100,100,450,400); // set window visibility this. setVisible (true);} public static void main (String [] args) {// TODO Auto-generated method stubnew Winnull2 ();}}