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In Java, it is a container in which you can place other visual objects.
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What is JLabel in java?
You can use a JLabel to put text on a JPanel. You put a string in the JLabel and put the JLabel on a JPanel
How do you identify which JPanel type panel caused the event in Java?
I never tried this, but it should work if you get the event source and cast it to a JPanel object. This is what it should look like:JPanel newPanel = (JPanel) event.getSource();What you did is assign the reference of the source panel to a new panel, and now you can go on with your code.
What is a getContentPane method in Java?
The getContentPane() method is used to get the main component in a Java Swing JFrame. It is usually a JPanel.
How do you set button size in GridLayout java?
You don't. GridLayout is one of the layout managers that completely ignores all .setSize and .setPreferredSize method calls. If you want to set the size of buttons in a GridLayout, you should add each button to a JPanel, and add the JPanels to the Container with a GridLayout. This way you can use, for example, a FlowLayout on the JPanel and use a button.setPreferredSize method call to try to keep the buttons a particular size.
What is GridLayout?
GridLayout organizes a JPanel like a 2-dimensional array (think battleship board game board) so you can easier add items to it in an organized manner
What is JLabel in java?
You can use a JLabel to put text on a JPanel. You put a string in the JLabel and put the JLabel on a JPanel
How do you identify which JPanel type panel caused the event in Java?
I never tried this, but it should work if you get the event source and cast it to a JPanel object. This is what it should look like:JPanel newPanel = (JPanel) event.getSource();What you did is assign the reference of the source panel to a new panel, and now you can go on with your code.
Explain the usage of JPanel with example?
JPanel, a part of Java Swing package, is a container that can store a group of components. The main task of JPanel is to organize components, various layouts can be set in JPanel which provide better organization of components, and however it does not have a title bar. For Example: Program to create a JPanel with a Border layout and add components to it . // java Program to create a JPanel with a Border layout and add components to it . import java.awt.event.; import java.awt.; import javax.swing.*; class solution extends JFrame { // JFrame static JFrame f; // JButton static JButton b, b1, b2, b3; // label to diaplay text static JLabel l; // main class public static void main(String[] args) { // create a new frame to stor text field and button f = new JFrame("panel"); // create a label to display text l = new JLabel("panel label"); // create a new buttons b = new JButton("button1"); b1 = new JButton("button2"); b2 = new JButton("button3"); b3 = new JButton("button4"); // create a panel to add buttons and a specific layout JPanel p = new JPanel(new BorderLayout()); // add buttons and textfield to panel p.add(b, BorderLayout.NORTH); p.add(b1, BorderLayout.SOUTH); p.add(b2, BorderLayout.EAST); p.add(b3, BorderLayout.WEST); p.add(l, BorderLayout.CENTER); // setbackground of panel p.setBackground(Color.red); // add panel to frame f.add(p); // set the size of frame f.setSize(300, 300); f.show(); } }
What is a getContentPane method in Java?
The getContentPane() method is used to get the main component in a Java Swing JFrame. It is usually a JPanel.
What components can we attach to the content pane in jframe?
The default implementation allows you to add any component that is a subclass of the Component class.Every JFrame has one (and only one) Container object known as the root content pane. A Container object is itself a subclass of Component, so you may add other Container objects to the root content pane.Currently, the root content pane is implemented as a JPanel but getContentPane() is only guaranteed to return a Container object. Although you can downcast the returned Container to a JPanel, this is not recommended as there's no guarantee that future versions will always use a JPanel (and downcasts are discouraged in any case). This creates a problem when you want to set a border on the root content pane because Container object's do not implement the setBorder method.However, you can add a JPanel (with border) to the root content pane, effectively covering the entire root content pane, and then add any additional components to your JPanel, ignoring the root content pane altogether. Alternatively, you can construct a JPanel and replace the pre-defined root content pane with a call to JFrame.setContentPane(). In this way you guarantee the underlying root content pane is definitely a JPanel. Neither method is ideal, since both have a cost, but if you want a border in your root pane then it's a small price to pay.For some examples on working with panels, see How To Use Panels in Oracle's The Java Tutorial.
How do you set button size in GridLayout java?
You don't. GridLayout is one of the layout managers that completely ignores all .setSize and .setPreferredSize method calls. If you want to set the size of buttons in a GridLayout, you should add each button to a JPanel, and add the JPanels to the Container with a GridLayout. This way you can use, for example, a FlowLayout on the JPanel and use a button.setPreferredSize method call to try to keep the buttons a particular size.
What is GridLayout?
GridLayout organizes a JPanel like a 2-dimensional array (think battleship board game board) so you can easier add items to it in an organized manner
Java program code for student Information?
import javax.swing.*; import java.awt.*; import java.awt.event.*; class jwp extends JFrame implements ActionListener{ JButton button = new JButton ("Submit"); JTextField field = new JTextField(); JLabel label = new JLabel("Enter your name : ",Label.RIGHT); public jwp(){ super("JFrame with panel and button"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel panel = new JPanel(null); panel.add(label); panel.add(field); panel.add(button); setContentPane(panel); button.setBounds(100,70,100,50); label.setBounds(20,30,200,20); field.setBounds(120,30,100,20); button.addActionListener(this);} public void actionPerformed (ActionEvent e){ if (e.getSource() ==button){ JOptionPane.showMessageDialog(this,"Youre name was "+field.getText());} } } public class frame1 { public static void main (String[] args) { jwp start = new jwp(); start.setSize(300, 200); start.setVisible(true); } } that's alll.......i can't upgrade it anymore......
How do you do fcfs program in easy method using java?
import javax.swing.*; import java.awt.*; import java.awt.event.*; class fcfs extends JFrame implements ActionListener { JButton jb[] = new JButton[3]; JTextField jt1[],jt2[]; JLabel jl[],jl1,jl2,jl3; JPanel jp,jp1; Container con; int k,p; String str[] = {"SUBMIT","RESET","EXIT"}; String str1[] = {"Process"," AT","ST","WT","FT","TAT","NTAT"}; public fcfs() { super("fcfs scheduling algoritham"); con = getContentPane(); k= Integer.parseInt(JOptionPane.showInputDialog("Enter number of process")); jl1 = new JLabel("Process"); jl2 = new JLabel("Arival Time"); jl3 = new JLabel("Service Time"); jl = new JLabel[k]; jt1 = new JTextField[k]; jt2 = new JTextField[k]; for(int i=0;i<k;i++) { jl[i] = new JLabel("process"+(i+1)); jt1[i] = new JTextField(10); jt2[i] = new JTextField(10); } for(int i=0;i<3;i++) { jb[i] = new JButton(str[i]); } con.setLayout(new GridLayout(k+2,3)); con.add(jl1); con.add(jl2); con.add(jl3); int l=0; for(int i=0;i<k;i++) { con.add(jl[l]); con.add(jt1[l]); con.add(jt2[l]); l++; } l=0; for(int i=0;i<3;i++) { con.add(jb[l]); jb[l].addActionListener(this); l++; } }//end of constructor public void actionPerformed(ActionEvent ae) { int FT[] = new int[k]; int WT[] = new int[k]; int TAT[] = new int[k]; float NTAT[] = new float[k]; float sum=0; float avg; JPanel main = new JPanel(); main.setLayout(new BorderLayout()); jp = new JPanel(); jp1 = new JPanel(); jp.setLayout(new GridLayout(k+1,7)); jp1.setLayout(new FlowLayout()); if(ae.getSource() jb[1]) { setVisible(false); fcfs window = new fcfs(); window.setSize(400,300); window.setVisible(true); window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } }//END ACTION PERFORMED public static void main(String[] args) { fcfs window = new fcfs(); window.setSize(400,300); window.setVisible(true); window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); }//end main }//end class
How do you create packag in java?
You can easily create Java packages with a few steps. # Create a set of classes that you want to be in your package. # Use the package keyword at the top of each of these classes to declare which package they're in. # Organize your source files such that a package name corresponds to a directory name. For instance, the JPanel class has a "package javax.swing;" declaration in the source file, and is located in the javax/swing folder.
How do you set bound to tab pane in java swing?
import java.awt.*; import javax.swing.*; public class SixChoicePanel extends JPanel { public SixChoicePanel(String title, String[] buttonLabels) { super(new GridLayout(3, 2)); setBackground(Color.lightGray); setBorder(BorderFactory.createTitledBorder(title));ButtonGroup group = new ButtonGroup(); JRadioButton option; int halfLength = buttonLabels.length/2; // Assumes even length for(int i=0; i
You want to get source code of web browser in java?
import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.net.*;import java.io.*;public class Browser{private JFrame frame;private JPanel panelTop;private JEditorPane editor;private JScrollPane scroll;private JTextField field;private JButton button;private JButton button1;private URL url;public Browser(String title){initComponents();//set the title of the frameframe.setTitle(title);//set the default cloe op of the jframeframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//set size of frameframe.setSize(1370,700);//add jpanel to north of jframeframe.add(BorderLayout.NORTH, panelTop);//add textfield and navigation button to jpanel.panelTop.add(field);panelTop.add(button);//panelTop.add(button1);// panelTop.add(button);//add scroll pane to jframe centerframe.add(BorderLayout.CENTER, scroll);//set the frame visibleframe.setVisible(true);}//end Browser() constructorprivate void initComponents(){//create the JFrameframe = new JFrame();//create the JPanel used to hold the text field and button.panelTop = new JPanel();//set the urltry{url = new URL("http://www.mr-jatt.com");}catch(MalformedURLException mue){JOptionPane.showMessageDialog(null,mue);}//create the JEditorPanetry{editor = new JEditorPane(url);//set the editor pane to false.editor.setEditable(false);}catch(IOException ioe){JOptionPane.showMessageDialog(null,ioe);}//create the scroll pane and add the JEditorPane to it.scroll = new JScrollPane(editor, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);//create the JTextFieldfield = new JTextField();//set the JTextField text to the url.//we're not doing this on the event dispatch thread, so we need to use//SwingUtilities.SwingUtilities.invokeLater(new Runnable(){public void run(){field.setText(url.toString());}});//create the button for chanign pages.button = new JButton("Go");//add action listener to the buttonbutton.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {try{editor.setPage(field.getText());}catch(IOException ioe) {JOptionPane.showMessageDialog(null, ioe);}}});//button=new JButton("back");}//end initComponents()public static void main(String[] args){SwingUtilities.invokeLater(new Runnable(){public void run(){new Browser("Simple web browser");}});}//end main method.}//end Browser class
