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Object Oriented Programming Articles
Page 536 of 589
Java Program to get the previous leaf from a JTree
Use the getPreviousLeaf() method to get the previous leaf in a JTree. Here, we are displaying the leaf before this node “eight” on Console -System.out.println("Get Previous Leaf = "+eight.getPreviousLeaf());The following is an example to get the previous leaf from a JTree -Examplepackage 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 (Product2 - P66779)"); ...
Read MoreHow can I set a table in a JPanel in Java?
Let us first set rows and columns for our table −String[][] rec = { { "1", "Steve", "AUS" }, { "2", "Virat", "IND" }, { "3", "Kane", "NZ" }, { "4", "David", "AUS" }, { "5", "Ben", "ENG" }, { "6", "Eion", "ENG" }, }; String[] header = { "Rank", "Player", "Country" };Now, set the above in a table as rows and columns −JTable table = new JTable(rec, header);Add the table in the panel −JPanel panel = new JPanel(); panel.add(new JScrollPane(table));The following is an example to create a table in a panel −Examplepackage my; ...
Read MoreHow to make a JTree editable in Java?
To make JTree editable in Java, use the TreeCellEditor class. With that, set the setEditable() method to true −TreeCellEditor editor = new DefaultCellEditor(textField); tree.setEditable(true); tree.setCellEditor(editor);The above will make the tree editable. The following is an example to make a JTree editable in Java −Examplepackage my; import javax.swing.DefaultCellEditor; import javax.swing.JFrame; import javax.swing.JTextField; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.TreeCellEditor; 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"); DefaultMutableTreeNode node2 = ...
Read MoreHow to make a canvas in Java Swing?
To make a canvas with Java Swing, use the Graphics2D class −public void paint(Graphics g) { Graphics2D graphic2d = (Graphics2D) g; graphic2d.setColor(Color.BLUE); graphic2d.fillRect(100, 50, 60, 80); }Above, we have created a rectangle and also added color to it.The following is an example to make a canvas in Java −Examplepackage my; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import javax.swing.JFrame; import javax.swing.JPanel; public class SwingDemo extends JPanel { @Override public void paint(Graphics g) { Graphics2D graphic2d = (Graphics2D) g; graphic2d.setColor(Color.BLUE); graphic2d.fillRect(100, 50, 60, 80); } public ...
Read MoreWhat are the Selection Modes in a JTable with Java?
Selection modes sets the table's selection mode to allow only single selections, a single contiguous interval, or multiple intervals. Let us see the selection modes one by one −Single Selection modeThe following is an example of Single Selection mode for a JTable. It allows you to select one cell at a time −Examplepackage my; import java.awt.Color; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.ListSelectionModel; import javax.swing.border.TitledBorder; public class SwingDemo { public static void main(String[] args) { JFrame frame = new JFrame(); JPanel panel = new JPanel(); ...
Read MoreHow to select the first column in a JTable with Java?
To select the first column in a JTable, use the setColumnSelectionInterval() method. Here, set the indexes as interval for one end as well as other end.For the first column, set the range as 0 and 0 since we want to only select the first column with index 0 −table.setColumnSelectionInterval(0, 0);The following is an example to select the first column in a JTable −Examplepackage my; import java.awt.Color; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.ListSelectionModel; import javax.swing.border.TitledBorder; public class SwingDemo { public static void main(String[] args) { JFrame frame = new JFrame(); ...
Read MoreHow to select more than one row at a time in a JTable with Java?
To select more than one row in a JTable, use the setRowSelectionInterval() method. Here, set the indexes as interval for one end as well as other end.For multiple rows in a range, set the range. Here, we are selecting rows from index 1 to index 2 i.e. two rows −table.setRowSelectionInterval(1, 2);The following is an example to select more than one row at a time in a JTable −Examplepackage my; import java.awt.Color; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.ListSelectionModel; import javax.swing.border.TitledBorder; public class SwingDemo { public static void main(String[] args) { JFrame ...
Read MoreDisable Tooltip for a component with an already enabled tooltip in Java
Let’s say we have set the tooltips for all the components using the following method in Java, for example −setToolTipText("Enter Age");Here, we have already enabled tooltips for all the components using the setToolTipText(). But, after enabling all of them, we disabled the tooltips using the following −ToolTipManager.sharedInstance().setEnabled(false);The following is an example to disable Tooltip for a component with an already enabled tooltip −Examplepackage my; import java.awt.GraphicsEnvironment; import java.awt.GridLayout; import java.awt.Point; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.SwingConstants; import javax.swing.ToolTipManager; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame.setDefaultLookAndFeelDecorated(true); ...
Read MoreHow to set all the values at once using the model in a JProgressBar with Java?
The getModel() method is used to set all the values at once for a JProgressBar −int newVal = 5; int newMin = 0; int newMax = 100; progressBar.getModel().setRangeProperties(newVal, 0, newMin, newMax, true);The following is an example to set all the values at once using the model in a progress bar −Examplepackage my; import javax.swing.*; public class SwingDemo extends JFrame { JProgressBar progressBar; int i = 0; SwingDemo() { int min = 0; int max = 1000; progressBar = new JProgressBar(min, max); int newVal = 5; ...
Read MoreHow can we get the values of a JProgressBar Component and display in Console?
Let’s say we have set the following values for JProgressBar −int min = 0; int max = 1000; progressBar = new JProgressBar(min, max);Now, get the above values and display in the Console −int value = progressBar.getValue(); System.out.println("Value = "+value); System.out.println("Minimum = "+progressBar.getMinimum()); System.out.println("Maximum = "+progressBar.getMaximum());The following is an example to get the values of a progress bar component −Examplepackage my; import javax.swing.*; public class SwingDemo extends JFrame { JProgressBar progressBar; int i = 0; SwingDemo() { int min = 0; int max = 1000; progressBar = new JProgressBar(min, ...
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