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Object Oriented Programming Articles
Page 534 of 589
How to set font face, style, size and color for JTextPane text in Java
For background and foreground color of the JTextPane, use the following −JTextPane textPane = new JTextPane(); textPane.setBackground(Color.blue); textPane.setBackground(Color.green);For font face, style and size, use the Font class and set the font −Font font = new Font("Serif", Font.ITALIC, 18); textPane.setFont(font);The following is an example to set font, style and color for text in JTextPane −Examplepackage my; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import java.awt.Font; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextPane; import javax.swing.text.BadLocationException; import javax.swing.text.SimpleAttributeSet; import javax.swing.text.Style; import javax.swing.text.StyleConstants; import javax.swing.text.StyledDocument; public class SwingDemo { public static void main(String args[]) throws BadLocationException { JFrame frame = new JFrame("Demo"); ...
Read MoreHow to add a Tab in JTabbedPane with Java?
Let us first create a JTabbedPane −JTabbedPane tabbedPane = new JTabbedPane();Create some panels −JPanel panel1, panel2, panel3, panel4, panel5; panel1 = new JPanel(); panel2 = new JPanel(); panel3 = new JPanel(); panel4 = new JPanel(); panel5 = new JPanel();Now, add tabs using the addTab() method and set the panels as well in which the tabs would be visible −tabbedPane.addTab("PHP", panel1); tabbedPane.addTab("Blockchain ", panel2); tabbedPane.addTab("Matlab", panel3); tabbedPane.addTab("JSP ", panel4); tabbedPane.addTab("Servlet", panel5);The following is an example to add a tab in JTabbedPane −package my; import javax.swing.*; import java.awt.*; public class SwingDemo { public static void main(String args[]) { ...
Read MoreHow to specify tab location to make it visible in the bottom with Java?
Use the setTabPlacement() method to set the tab location. To make it visible in the bottom, use the BOTTOM constant −JTabbedPane tabbedPane = new JTabbedPane(); tabbedPane.setTabPlacement(JTabbedPane.BOTTOM);The following is an example to specify tab location to make it visible in the bottom −package my; import javax.swing.*; import java.awt.*; import java.awt.event.KeyEvent; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Technologies"); JTabbedPane tabbedPane = new JTabbedPane(); JPanel panel1, panel2, panel3, panel4, panel5; panel1 = new JPanel(); panel2 = new JPanel(); ...
Read MoreHow to set TabLayout Policy to JTabbedPane in Java when all the tabs does not fit in a single run
To set TabLayout Policy to JTabbedPane in Java when all the tabs does not fit in a single run, use the method setTabLayoutPolicy() −JTabbedPane tabbedPane = new JTabbedPane(); tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);Above we have set the constant to be SCROLL_TAB_LAYOUT, which is a tab layout policy for providing a subset of available tabs when all the tabs will not fit within a single run.The following is an example −package my; import javax.swing.*; import java.awt.*; import java.awt.event.KeyEvent; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Devices"); JTabbedPane tabbedPane = new JTabbedPane(); ...
Read MoreHow to check if two nodes are equal in a JTree with Java?
To check if two nodes are equal, use the equals() method. Here, we are checking that node1 and node2 are equal or not.node1.equals(node2)The following is an example to check if two nodes are equal in a JTree −package my; import javax.swing.JFrame; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame("Demo"); DefaultMutableTreeNode node = new DefaultMutableTreeNode("Website"); DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Videos"); DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Tutorials"); DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("QA"); ...
Read MoreSet whether the cell in the table model can be selected or deselected in Java?
We can set or disallow selection of cell in the table using setCellSelectionEnabled(). The following is an example. −If you want to allow selection of cell, then set the method to TRUE −table.setCellSelectionEnabled(true);If you want to disallow selection of cell, then set the method to FALSE −table.setCellSelectionEnabled(false);Here we have disallowed selection of a cell −Examplepackage my; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.table.DefaultTableModel; public class SwingDemo { public static void main(String[] argv) throws Exception { DefaultTableModel tableModel = new DefaultTableModel(); JTable table = new JTable(tableModel); tableModel.addColumn("Language/ Technology"); ...
Read MoreHow to get this node's first child in a JTree with Java?
Let’s say we want the first child node of a node, then use the getFirstChild() method −node2.getFirstChild()Display the node’s first child on Console −System.out.println("The first child of node 2 = "+node2.getFirstChild());The following is an example to get this node’s first child in a JTree −package my; import javax.swing.JFrame; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame("Demo"); DefaultMutableTreeNode node = new DefaultMutableTreeNode("Products"); DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Clothing (Product1 - P66778)"); DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Accessories ...
Read MoreDelete the first 10 characters from JTextArea in Java
Let’s say the following is our JTextArea with default text −JTextArea textArea = new JTextArea("The text added here is just for demo. " + "This demonstrates the usage of JTextArea in Java. In this example we have" + "deleted some text.");Now to remove the first 10 characters, use replaceRange() method and set null from one end to another i.e. deleting characters in a range. The replaceRaneg() method Replaces text from the indicated start to end position with the new text specified i.e.e here null will replace the first 10 characters −int start = 0; int end = 10; ...
Read MoreCan we select only some of the text in JTextArea?
Yes, we can do that using built-in methods of JTextArea components. Let’say the following is our JTextArea −JTextArea textArea = new JTextArea("This is a text displayed for our example. We have selected some of the text.");Now, use the methods setSelectionStart() and setSelectionEnd() to select some text in a range −textArea.setSelectionStart(5); textArea.setSelectionEnd(20);The following is an example to select some of the text in a JTextArea −Examplepackage my; import java.awt.GridLayout; import javax.swing.*; public class SwingDemo { SwingDemo() { JFrame frame = new JFrame("Demo"); JTextArea textArea = new JTextArea("This is a text displayed for our example. ...
Read MoreJava Program to replace the first 10 characters in JTextArea
To replace the first 10 character in text area, use the replaceRange() method in Java and replace the old text with the new text.Let’s say the following is oude demo text set with JTextArea −JTextArea textArea = new JTextArea("This is a text displayed for our example. We have replaced some of the text.");Now, replace the characters in a range −int begn = 0; int end = 10; // replace textArea.replaceRange("Replaced! ", begn, end);The following is an example to replace the first 10 charactrers in JTextArea −Examplepackage my; import java.awt.GridLayout; import javax.swing.*; public class SwingDemo { SwingDemo() { ...
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