820 Java Code for Creating a chief panel, two sub panels, and inserting them into a JFrame

Here is a java 8 code, for designing one main panel, two sub panels, and inserting them into a JFrame, and then showing them alternatively with two buttons. //Creating Two sub panels, one main panel, and showing them in a JFrame in a Customized manner.
//Compiled successfully on Java8. May work on lower versions also.

//Standard Naming practices have not been followed.

//My immense gratitude to Netizens of magnanimity.

//To compile this, it should be saved in a text file named ycardlayou.java.

//Compilation at Commandline: yourpathtojava /or javac ycardlayou.java.

//Using the class generated, to see the result: yourpathtojava / or java ycardlayou //Creating Two sub panels, one main panel, and showing them in a JFrame in a Customized manner. //Compiled successfully on Java8. May work on lower versions also. //Standard Naming practices have not been followed. //My immense gratitude to Netizens of magnanimity. //To compile this, it should be saved in a text file named ycardlayou.java. //Compilation at Commandline: yourpathtojava /or javac ycardlayou.java. //Using the class generated, to see the result: yourpathtojava / or java ycardlayou import java.awt.*; //To use ActionListener, ActionEvent import java.awt.event.*; import javax.swing.*; import java.io.*; //ycardlayou is the public class //ycardlayou() is its method //upanel1 is the main panel //upanel11 is first sub panel //upanel12 is second sub panel //ufra is JFrame. //ub1 is first button //ub2 is second button public class ycardlayou { JFrame ufra; final JPanel upanel1=new JPanel(); JPanel upanel11=new JPanel(); JPanel upanel12=new JPanel(); final CardLayout ucard=new CardLayout(); public ycardlayou() { ufra = new JFrame("Card Layout which has one main panel, two subpanels"); ufra.setSize(500,500); ufra.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //adding labels to subpanels upanel11.add(new JLabel("This is first sub panel")); upanel11.setBackground(Color.red); upanel12.add(new JLabel("This second sub panel")); upanel12.setBackground(Color.green); //Defining adn adding buttons to subpanels JButton ub1=new JButton("Show first sub panel"); JButton ub2=new JButton("Show second sub panel"); upanel11.add(ub2); upanel12.add(ub1); ///////////////////////////////// //designing mainpanel upanel1 with sub panels upanel 11, and upanel 12. upanel1.setLayout(ucard); upanel1.add(upanel11, "one"); // id one refers upanel11 upanel1.add(upanel12, "two"); // id two refers upanel12 upanel1.setVisible(true); //////////////////////////////////button1 addactionlistener///////////////// //addactionlistenerNewActionListener for button ub1.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent ae){ upanel11.setVisible(true); upanel12.setVisible(false); //ucard.show(upanel11, "two"); // shows upanel12 } //actionperformedactionevent }); //addActionListner ////////////////////////////////////second button//////////////// //adding actionlistenernewactionlistener to ubtn2 ub2.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent ae){ upanel12.setVisible(true); upanel11.setVisible(false); //ucard.show(upanel12, "one"); // shows upanel11 } //actionevent }); //actionlistener /////////////////////////////////////////////////////////////////// //adding upanel1 mainpanel to ufra ufra.add(upanel1); ufra.pack(); ufra.setVisible(true); } //end ycardlayoumetho public static void main (String[] args) { ycardlayou yucl= new ycardlayou(); } //psvm } //pc