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Programming Articles
Page 1698 of 2547
Java program to convert properties list into a Map
In this article, we will learn how to convert a Properties list into a Map in Java. The Properties class is commonly used to store key-value pairs, but sometimes you may need to work with these pairs in a Map structure. We will demonstrate how to take the properties and convert them into a HashMap. Problem Statement Write a program in Java to convert the properties list into a Map structure − Output Key and Value of the Map... P: 1 Q: 2 R: 3 S: 4 T: 5 U: 6 V: 7 Steps to convert the properties list into ...
Read MoreJava program to display printable characters
In this article, we will learn to display printable characters in Java. The program uses ASCII code from 32 to 126, which correspond to printable symbols, numbers, and letters. Instead of using System.out.println(), we will use System.out.write() to print each character. Problem Statement Write a Java program that displays all printable characters by iterating through their ASCII values − Output Printable characters... ! " # $ % & '( ) * + , - . /0 1 2 3 4 5 6 78 9 : ; < = > ?@ A B C D E F GH I J K L M N OP Q R S T U V WX Y Z [ \ ] ^ _` a b c d e f gh i j k l m n op q r s t u v wx y z { | } ~ Steps to display printable characters Following are the steps to display printable characters − Start by printing the message "Printable characters...". Use a for loop to iterate over ASCII ...
Read MoreJava Program to Sort 2D Array Across Left Diagonal
For a given 2D array, our task is to write a Java program to sort its element present across the left diagonal. For this problem, we need to arrange the elements of the array in such a way that the values are sorted when read from the top left to the bottom right, which is the left diagonal of the array. Example Scenario: Input: matrix = {3, 8, 2}, {6, 5, 4}, {3, 2, 1}; Output: new_matrix = {1, 4, 2}, {2, 3, 8}, {3, 6, 5} Use the below sorting tool to understand the problem: Sorting Tool ...
Read MoreJava program to get the difference between two time zones by seconds
In this article, we will learn to get the difference between two time zones by seconds using Java. We'll use LocalDateTime, ZoneId, and ZonedDateTime classes from java.time package to achieve this.Problem Statement Write a program in Java to get the difference between two time zones by seconds − Output Difference between two time zones in seconds = 28800 Steps to get the difference between two time zones by seconds Following are the steps to get the difference between two time zones by seconds − First, we will import the necessary classes LocalDateTime, ZoneId, and ZonedDateTime from ...
Read MoreJava program to add 3 months to the calendar
In this article, we will learn to add 3 months to the calendar. We will take the current date and add 3 months to it using Calendar class in Java. You’ll see how to handle date manipulation and update the date accordingly. Problem Statement Write a program in Java to add 3 months to the calendar. Below is the demonstration of the same − Input Current Date = Fri Nov 23 06:38:56 UTC 2018 Output Updated Date = Sat Feb 23 06:38:56 UTC 2019 Different approaches Below are the different approaches to add 3 months to the calendar − ...
Read MoreJava program to change JLabel text after creation
In this article, we will learn to change JLabel text after creation in Java. We'll cover two scenarios: changing the label text immediately after creation and updating it in response to a button click. Different approaches to change JLabel text after creation Below are the different approaches to change JLabel text after the creation − Using setText() Method Using a button click Update JLabel text using setText() method Following are the steps to update JLabel text immediately after creation − First we will import JFrame, JLabel, and ...
Read MoreJava program to extract a single quote enclosed string from a larger string using Regex
Regex or Regular Expression is the language used for pattern-matching and string manipulation. It consists of a sequence of characters that define a search pattern and can be used for performing actions like search, replace, and even validate on text input. A regular expression consists of a series of characters and symbols that amount to form a search pattern. In this article, we are going to see how to write a Java program to extract a single quote-enclosed string from a larger string using Regex. Java provides support for regex from the java.util.regex package. The pattern class represents a compiled ...
Read MoreJava program to check whether a number is positive or negative
In this article, we will learn to check whether the number is positive or negative in Java. To check whether the specified number is positive or negative can be determined with respect to 0. A number greater than 0 is considered a positive number whereas a number less than 0 is considered a negative number, we can use Java conditional statements like if-else-if blocks or ternary operators. Before that let's discuss the problem statement with the help of examples − Problem Statement Given an integer number as an input, write a Java program to check whether the number is positive ...
Read MoreJava program to print diamond star pattern
In this article, we will understand how to print the Diamond Star pattern using Java. The pattern is formed by using multiple for-loops and print statements. Output Below is the demonstration of the diamond star pattern − The diamond star pattern : * *** ***** ******* ********* *********** ************* *************** ************* *********** ********* ******* ***** ...
Read MoreJava program to calculate sum of squares of first n natural numbers
In this article, you will learn to write a program in Java to calculate the sum of squares of first n natural numbers. This program efficiently computes the sum using a mathematical formula − (val * (val + 1) / 2) * (2 * val + 1) / 3 Problem Statement Write a program in Java to calculate the sum of squares of first n natural numbers, where n is a user-defined value. Input val = 8 Output The sum of squares of first 8 natural numbers is204 Steps to calculate sum of squares of first n natural numbers Following are ...
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