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Object Oriented Programming Articles
Page 520 of 589
How to add tooltip to JLabel in Java?
Tooltip is visible whenever you will place the mouse cursor on the label. Use the setToolTipText() method to add tooltip to JLabel −label.setToolTipText("This is a demo tooltip");The following is an example to add tooltip to JLabel −Exampleimport java.awt.Color; import java.awt.Font; import javax.swing.*; import javax.swing.border.Border; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Demo"); JLabel label; label = new JLabel("Demo Label!"); label.setFont(new Font("Verdana", Font.PLAIN, 14)); label.setToolTipText("This is a demo tooltip"); Border border = BorderFactory.createLineBorder(Color.ORANGE); ...
Read MoreHow to filter String list by starting value in Java?
Let’s first create a String list −List list = new ArrayList(); list.add("wxy"); list.add("zabc"); list.add("ddd2"); list.add("def"); list.add("ghi"); list.add("wer"); list.add("uij"); list.add("wqy");To filter String list by starting value, use filter() and startsWith() −list.stream().filter((b) -> b.startsWith("w"))The following is an example to filter string list by starting value −Exampleimport java.util.ArrayList; import java.util.List; public class Demo { public static void main(final String[] args) { List list = new ArrayList(); list.add("wxy"); list.add("zabc"); list.add("ddd2"); list.add("def"); list.add("ghi"); list.add("wer"); list.add("uij"); list.add("wqy"); ...
Read MoreHow can I filter string value with starting letter?
Let’s say the following is our String List −List list = Arrays.asList("Jonny", "David", "Tony", "Jacob", "Smith", "Bravo", "Gayle", "John");Now filter the string value with starting letter −Stream stream = list.stream().filter(name -> name.startsWith("J"));The following is an example to filter string value with starting letter −Exampleimport java.util.Arrays; import java.util.List; import java.util.stream.Collectors; import java.util.stream.Stream; public class Demo { public static void main(String[] args) { List list = Arrays.asList("Jonny", "David", "Tony", "Jacob", "Smith", "Bravo", "Gayle", "John"); System.out.println("List with elements..."); for (String res : list) { System.out.print(res+" ...
Read MoreHow to Map IntSteam to String object in Java
To Map IntStream to String object, use mapToObj and within that set the values −.mapToObj(val -> "z" + val)Before that, we used range() on IntStream −IntStream.range(1, 10)The following is an example to map IntStream to String object in Java −Exampleimport java.util.stream.IntStream; public class Demo { public static void main(String[] args) throws Exception { IntStream.range(1, 10) .mapToObj(val -> "z" + val) .forEach(System.out::println); } }Outputz1 z2 z3 z4 z5 z6 z7 z8 z9
Read MoreHow to Map double to int Object with mapToInt and mapToObj in Java?
At first, we have set the stream −Stream.of(3.5, 4.7, 7.9, 8.2, 9.1, 10.5, 12.3, 15.8)Now to Map double to int Object, use mapToObj −.mapToInt(Double::intValue) .mapToObj(a -> "val" + a)The following is an example to Map double to int Object with mapToInt and mapToObj −Exampleimport java.util.stream.Stream; public class Demo { public static void main(String[] args) throws Exception { Stream.of(3.5, 4.7, 7.9, 8.2, 9.1, 10.5, 12.3, 15.8) .mapToInt(Double::intValue) .mapToObj(a -> "val" + a) .forEach(System.out::println); } }Outputval3 val4 val7 val8 val9 val10 val12 val15
Read MoreMap to add String value to each element in Java
Let’s say the following is our String List −List list = Arrays.asList("Football", "Basketball", "Hockey", "Cricket", "Fencing");Now, map to add string to each element −List str = list.stream().map(name -> "Sports " + name + " Outdoor") .collect(Collectors.toList());Above, we have added “Sports” and “Outdoor” strings to each element.The following is an example to Map and add string value to each element in Java −Exampleimport java.util.Arrays; import java.util.List; import java.util.stream.Collectors; public class Demo { public static void main(String[] args) { List list = Arrays.asList("Football", "Basketball", "Hockey", "Cricket", "Fencing"); List str = list.stream().map(name -> "Sports " ...
Read MoreHow to change JLabel size in Java?
With Java Swing, you can set JLabel size as preferred size different than the default −JLabel label.setPreferredSize(new Dimension(250, 100));The following is an example to change JLabel size −Exampleimport java.awt.Color; import java.awt.Dimension; import java.awt.Font; import javax.swing.*; import javax.swing.border.Border; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Demo"); JLabel label; label = new JLabel("This is demo label!", JLabel.RIGHT); label.setVerticalAlignment(JLabel.TOP); label.setFont(new Font("Verdana", Font.PLAIN, 15)); label.setPreferredSize(new Dimension(250, 100)); label.setForeground(new Color(120, 90, 40)); label.setBackground(new ...
Read MoreJava sql.Timestamp toString() method with example
The toString() method of the java.sql.Timestamp class returns the JDBC escape format of the time stamp of the current Timestamp object as String variable.i.e. using this method you can convert a Timestamp object to a String.//Retrieving the Time object Timestamp timestampObj = rs.getTimestamp("DispatchTimeStamp"); //Converting the Time object to String format String time_stamp = timestampObj.toString();ExampleLet us create a table with the name dispatches_data in MySQL database using CREATE statement as shown below:CREATE TABLE dispatches_data( ProductName VARCHAR(255), CustomerName VARCHAR(255), DispatchTimeStamp timestamp, Price INT, Location VARCHAR(255));Now, we will insert 5 records in dispatches_data table using INSERT statements:insert into ...
Read MoreHow to disable a JLabel in Java?
To disable a JLabel, use the setEnabled() method −JLabel label; label.setEnabled(false);The following is an example to disable a JLabel −package my; import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import javax.swing.*; import javax.swing.border.Border; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Demo"); JLabel label; label = new JLabel("First Label", JLabel.RIGHT); label.setVerticalAlignment(JLabel.TOP); label.setFont(new Font("Verdana", Font.PLAIN, 15)); label.setPreferredSize(new Dimension(250, 100)); label.setForeground(new Color(120, 90, 40)); label.setBackground(new Color(100, 20, 70)); label.setEnabled(false); ...
Read MoreSet Bounds for JProgressBar in Java Swing
Use the setBounds() method to set Bounds for JProgressBar in Java Swing −JProgressBar progressBar; progressBar.setBounds(70, 50, 120, 30);The following is an example to set bounds for JProgressBar −Examplepackage my; import javax.swing.*; public class SwingDemo extends JFrame { JProgressBar progressBar; int i = 0; SwingDemo() { progressBar = new JProgressBar(0, 1000); progressBar.setBounds(70, 50, 120, 30); progressBar.setValue(0); progressBar.setStringPainted(true); add(progressBar); setSize(550, 150); setLayout(null); } public void inc() { while (i
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