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Programming Articles
Page 2463 of 2547
How to create Message Pop-Ups with Java?
To create Message Pop-ups, use the following JOptionPane −JOptionPane.showMessageDialogWe are displaying a tree inside the message pop-ups. The following is an example to create Message Pop-Ups with Java −Examplepackage my; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JScrollPane; 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("Project"); DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("App"); DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Website"); DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("WebApp"); node.add(node1); ...
Read MoreMap to get substring and convert to int in Java
Let’s say the following is our stream:Stream.of("u2", "h9", "s8", "l3")Now, map to get the substring:.map(s -> s.substring(1))Convert to int and find the minimum:.mapToInt(Integer::parseInt) .min()The following is an example to Map and get substring and convert to int:Exampleimport java.util.stream.Stream; public class Demo { public static void main(String[] args) throws Exception { Stream.of("u2", "h9", "s8", "l3") .map(s -> s.substring(1)) .mapToInt(Integer::parseInt) .min() .ifPresent(System.out::println); } }Output2
Read MoreHow to set foreground color for different words in a JTextPane
To set the foreground color for different words, use the SimpleAttributeSet and StyleConstants class. With that, use StyledDocument class as well for different words style. For different words, use insertString().At first, create a new JTextPane -At first, create a new JTextPane: JTextPane pane = new JTextPane();Now, use the classes to set the style and color for some words −StyledDocument doc = textPane.getStyledDocument(); Style style = textPane.addStyle("", null); StyleConstants.setForeground(style, Color.red); StyleConstants.setBackground(style, Color.white); doc.insertString(doc.getLength(), "Game of Thrones ", style);Now, style some other words differently −StyleConstants.setForeground(style, Color.yellow); StyleConstants.setBackground(style, Color.gray); doc.insertString(doc.getLength(), "Season 8", style);The following is an example to set foreground color for different ...
Read MoreHow to convert an object array to an integer array in Java?
You can convert an object array to an integer array in one of the following ways −By copying each element from integer array to object array −Exampleimport java.util.Arrays; public class ObjectArrayToStringArray { public static void main(String args[]){ Object[] objArray = {21, 58, 69, 33, 65}; int length = objArray.length; int intArray[] = new int[length]; for(int i=0; i
Read MoreCan we sort a list with Lambda in Java?
Yes, we can sort a list with Lambda. Let us first create a String List:List list = Arrays.asList("LCD", "Laptop", "Mobile", "Device", "LED", "Tablet");Now, sort using Lambda, wherein we will be using compareTo():Collections.sort(list, (String str1, String str2) -> str2.compareTo(str1));The following is an example to sort a list with Lambda in Java:Exampleimport java.util.Arrays; import java.util.Collections; import java.util.List; public class Demo { public static void main(String... args) { List list = Arrays.asList("LCD", "Laptop", "Mobile", "Device", "LED", "Tablet"); System.out.println("List = "+list); Collections.sort(list, (String str1, String str2) -> str2.compareTo(str1)); System.out.println("Sorted List ...
Read MoreHow do I terminate a thread in C++11?
Here we will see, how to terminate the threads in C++11. The C++11 does not have direct method to terminate the threads.The std::future can be used to the thread, and it should exit when value in future is available. If we want to send a signal to the thread, but does not send the actual value, we can pass void type object.To create one promise object, we have to follow this syntax −std::promise exitSignal;Now fetch the associated future object from this created promise object in main function −std::future futureObj = exitSignal.get_future();Now pass the main function while creating the thread, pass ...
Read MoreJava Connection getSystemFunctions() method with example
This method retrieves the list of System functions supported by the current database. The names returned by this method are the Open CLI System function names.This method returns a String value holding the list of functions separated by commas (", ").To get the list of the System functions supported by the underlying database −Make sure your database is up and running.Register the driver using the registerDriver() method of the DriverManager class. Pass an object of the driver class corresponding to the underlying database.Get the connection object using the getConnection() method of the DriverManager class. Pass the URL the database and, user ...
Read MoreHow to create a Default Cell Editor that uses a JCheckBox in Java?
Create a check box first and set valueJCheckBox checkBox = new JCheckBox("In-Stock");Set the JCheckBox for the editor so that the editor uses the check box −TreeCellEditor editor = new DefaultCellEditor(comboBox); tree.setEditable(true); tree.setCellEditor(editor);The following is an example to create a Default Cell Editor that uses a JCheckBox −Examplepackage my; import javax.swing.DefaultCellEditor; import javax.swing.JCheckBox; import javax.swing.JFrame; 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"); ...
Read MoreIs main method compulsory in Java?
To compile a program, you doesn’t really need a main method in your program. But, while execution JVM searches for the main method. In the Java the main method is the entry point Whenever you execute a program in Java JVM searches for the main method and starts executing from it.The main method must be public, static, with return type void, and a String array as argument.public static int main(String[] args){ }You can write a program without defining a main it gets compiled without compilation errors. But when you execute it a run time error is generated saying “Main method ...
Read MoreSort a list that places nulls first in Java
Let us create a list first with string elements. Some of the elements are null in the List:List list = Arrays.asList("Jack", null, "Thor", null, "Loki", "Peter", null, "Hulk");Now, sort the above list and place nulls first with nullsFirst:list.sort(Comparator.nullsFirst(String::compareTo));The following is an example to sort a List that places nulls first:Exampleimport java.util.Arrays; import java.util.Comparator; import java.util.List; public class Demo { public static void main(String... args) { List list = Arrays.asList("Jack", null, "Thor", null, "Loki", "Peter", null, "Hulk"); System.out.println("Initial List = "+list); list.sort(Comparator.nullsFirst(String::compareTo)); System.out.println("List placing nulls first = "+list); ...
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