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The program below demonstrate how to change the default icons of a JTree component. We can change tree icons of the component which are the closed icon, the open icon and the leaf icon. package org.kodejava.swing; import javax.swing.*; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.DefaultTreeCellRenderer; import java.awt.*; import java.util.Objects; public class JTreeChangeIcon extends JFrame { public JTreeChangeIcon() throws […]
You can remove JTree default icons by modifying the tree cell renderer object. To get the cell renderer call the JTree.getCellRenderer() which will return a DefaultTreeCellRenderer object. Then you can remove the icon by setting a null value to the setLeafIcon(), setClosedIcon() and setOpenIcon(). package org.kodejava.swing; import javax.swing.*; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.DefaultTreeCellRenderer; import java.awt.*; public […]
To sort the elements of LinkedList we can use the Collections.sort(List<T> list) static methods. The default order of the sorting is a descending order. package org.kodejava.util; import java.util.LinkedList; import java.util.Collections; public class LinkedListSort { public static void main(String[] args) { LinkedList<String> grades = new LinkedList<>(); grades.add("E"); grades.add("C"); grades.add("A"); grades.add("F"); grades.add("B"); grades.add("D"); System.out.println("...
The get the first element we can use the LinkedList.getFirst() method and to get the last element we can use the LinkedList.getLast() method. package org.kodejava.util; import java.util.LinkedList; public class LinkedListGetFirstLast { public static void main(String[] args) { LinkedList<String> names = new LinkedList<>(); names.add("Alice"); names.add("Bob"); names.add("Carol"); names.add("Mallory"); // Get the first and the last element of […]
To reverse the order of LinkedList elements we can use the reverse(List<?> list) static method of java.util.Collections class. Here is the example: package org.kodejava.util; import java.util.LinkedList; import java.util.Collections; public class LinkedListReverseOrder { public static void main(String[] args) { LinkedList<String> grades = new LinkedList<>(); grades.add("A"); grades.add("B"); grades.add("C"); grades.add("D"); grades.add("E"); grades.add("F"); System.out.printl...
This program shows you how to use the remove(int index) method of LinkedList class to remove an item at specified index from linked list object. package org.kodejava.util; import java.util.LinkedList; public class LinkedListRemove { public static void main(String[] args) { LinkedList<String> names = new LinkedList<>(); names.add("Alice"); names.add("Bob"); names.add("Carol"); names.add("Mallory"); System.out.println("Original values are:"); System.out.println("===============...
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