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Java Articles
Page 183 of 450
Java program to merge duplicates of a List with TreeSet
In this article, we will learn to merge duplicate elements from a List in Java by using a TreeSet. This program will take a List of strings containing duplicate values, transfer the elements into a TreeSet, and display the unique, sorted elements. Using a TreeSet is ideal here because it automatically removes duplicates and orders the elements in natural order. Problem Statement Write a Java program to remove duplicate elements from a list using a TreeSet. The program should take a list with repeated elements, convert it into a TreeSet to eliminate duplicates, and display the unique, sorted elements. Input ...
Read MoreJava program to sort a List in case sensitive order
In this article, we will learn to sort a List in case-sensitive order in Java. Sorting in case-sensitive order places uppercase letters before lowercase letters (e.g., 'A' before 'a'), meaning that uppercase letters are prioritized in sorting. This program uses Java’s built-in Collections.sort method to arrange elements in this specific order. Problem Statement Given a list of mixed uppercase and lowercase letters, write a Java program that sorts the list in a case-sensitive order. Input { "P", "W", "g", "K", "H", "t", "E" } Output List = [P, W, g, K, H, t, E] Case Sensitive Sort = [E, H, ...
Read MoreJava program to get the reverse of an Integer array with Lambda expressions
In this article, we will learn to get the reverse of an Integer array with Lambda expressions in Java. By utilizing the Arrays.sort() method along with a custom comparator defined as a lambda expression, we can efficiently reorder the elements of the array in descending order. Lambda expressions are a concise way to represent functional interfaces, allowing you to write cleaner and more readable code. Problem Statement Write a program in Java to get the reverse of an Integer array with Lambda expressions − Input arr = {20, 50, 75, 100, 120, 150, 170, 200} Output Integer Array elements... 20 50 ...
Read MoreJava program to print matrix in Z form
In this article, we will learn to print a matrix in a "Z" pattern in Java. It starts from the top-left corner, moves horizontally across the top row, then diagonally down through the center, and finally across the bottom row. This pattern creates a "Z" shape with selected elements from the matrix. Problem Statement Write a program in Java to print a matrix in Z form. Input my_arr[][] = { { 34, 67, 89, 0}, { 0, 1, 0, 1 }, { 56, 99, 102, 21 }, {78, 61, 40, 99}} Output The matrix is34 67 89 0 0 99 ...
Read MoreJava program to set the height of only a single row in a JTable with multiple rows
In this article, we create a JTable in Java Swing to display information about different programming technologies and their tutorial availability. The table is set up with specific columns and rows, each containing data on a particular technology. We also demonstrate how to set a custom height for a single row in the table. Specifically, the height of the 4th row is adjusted to 30 pixels to show how you can control row height individually in a JTable. The table is then displayed within a scrollable JFrame window. table.setRowHeight(3, 30); The above sets row height to 30 pixels for row index ...
Read MoreJava program to print first letter of each word using regex
In this article, we will understand how to print the first letter of each word using regex. A regular expression is a sequence of characters that forms a search pattern. A regular expression can be a single character or a more complicated pattern. A regular expression helps you match or find other strings or sets of strings, using a specialized syntax held in a pattern. They can be used to search, edit, or manipulate text and data. Problem Statement Write a program in Java to print the first letter of each word using regex. Below is a demonstration of the same ...
Read MoreHow to set preferred size for BoxLayout Manager in Java?
In this article, we will learn to set the preferred size for a panel within a JFrame using the BoxLayout manager in Java Swing. By setting the preferred and maximum size for the panel, we can control the layout’s appearance, ensuring that the panel maintains a consistent size as other components are added. This approach is useful when arranging elements vertically or horizontally in a structured format while having specific size requirements. Steps to set preferred size for BoxLayout Manager The following are the steps for setting the preferred size for BoxLayout Manager in Java − ...
Read MoreJava program to format strings into table
In this article, we will learn how to format strings into a table using Java. Java's System.out.format() method is a convenient way to display formatted output. We will define a string format that specifies column widths to ensure uniform spacing, allowing us to create a neat table layout. By using this approach, we can display multiple rows of string data in a structured and readable format without manually adjusting spaces for each entry. Steps to format strings into a table Following are the steps to format strings into a table − Define a format string ...
Read MoreJava program to calculate the time of sorting an array
In this article, we will learn to measure the time taken to sort an array in Java. We will look at two methods to calculate sorting time: using the Date class and the System.nanoTime() method. First, we will use the Date class to track the time before and after the sorting operation, allowing us to calculate the duration in milliseconds. Then, we'll utilize System.nanoTime() to capture the time with greater precision, measuring in nanoseconds and converting the result to milliseconds. Different approaches Below are the different approaches to measure the time taken to sort an array using Java− ...
Read MoreReturning even numbers from a stack in java
Stacks in Java A stack is a Last-In-First-Out (LIFO) data structure. As shown below, the last book inserted onto the stack is the first to be removed, and the first book inserted into the stack is the last to be removed. In Java, a stack of integers can be created by importing the java.util.Stack package and invoking the Stack() constructor. Integer objects can be pushed onto the stack using the push() method. An example is provided in the following code snippet. Example Following is an example program − import java.util.Stack; public class Testing { public static ...
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