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Articles by Samual Sam
Page 88 of 151
Java Program to copy all the key-value pairs from one Map into another
In Java, maps are a powerful and versatile way to store key-value pairs. Often, you may find the need to merge the contents of one map into another. This can be done effortlessly using the putAll method available in the Map interface. Let's explore this functionality with an example and a step-by-step explanation. Problem Statement The goal is to combine two maps by adding all entries or selectively adding entries without overwriting existing ones in the destination map. Input Map 1 (Destination Map) Wallet: 700 Belt: 600 Map 2 (Source Map) Bag: 1100 Sunglasses: 2000 ...
Read MoreSplit String with Dot (.) in Java
In Java, strings are one of the most commonly used data types for storing text. Sometimes, you may need to split a string based on a specific delimiter, such as a dot (.). Java provides powerful string manipulation methods like split(). Split() method The split() method of Java String is used to divide a string into an array of substrings. This method takes a string in the form of a regular expression as a parameter, searches the currently existing string with the given pattern, and splits it at every occurrence of the pattern matched. Split String with Dot (.) in ...
Read MoreJava program to print a Fibonacci series
The Fibonacci Series generates subsequent numbers by adding two previous numbers. The Fibonacci series starts from two numbers − F0 & F1. The initial values of F0 & F1 can be taken as 0, 1, or 1, 1 respectively. Fn = Fn-1 + Fn-2 Problem Statement Write a program in Java program to print a Fibonacci series. Input Run the program Output 1 1 2 3 5 8 13 21 34 55 The above output is obtained when the values of n=10. Different approaches to print a Fibonacci series Following are the different approaches to printing a Fibonacci series − ...
Read MoreJava program to convert HashMap to TreeMap
In this article, we will convert a HashMap to a TreeMap in Java. A HashMap is used for storing data as key-value pairs, but it doesn’t keep the keys in any particular order. A TreeMap sorts the keys in ascending order. By converting a HashMap to a TreeMap, we can ensure that the keys are stored in a sorted way. Problem StatementGiven a HashMap filled with key-value pairs, we need to convert it into a TreeMap so that the entries are sorted by the keys.Input ("1", "A"), ("2", "B"), ("3", "C"), ("4", "D"), ("5", "E"), ("6", "F"), ("7", ...
Read MoreJava program to subtract week from current date
In this article, we will learn to subtract the week from the current date using Java. This is useful when you need to manipulate dates, such as calculating dates from previous weeks for scheduling or tracking purposes. We'll use two approaches: using the Calendar class and the LocalDate class, showcasing how to easily adjust dates. Problem Statement Write a program in Java to subtract a specified number of weeks from the current date and display the updated date − Input Run the program Output Current Date = Mon Nov 04 09:41:18 IST 2024 Updated Date = Mon Oct 21 09:41:18 ...
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 MoreJava program to display table with columns in the output using Formatter
In this article, we will learn to display a table with columns in the output using Formatter in Java. The table will have headings and show different calculations of an array of floating-point numbers. The first column will display the original number, the second will display the number rounded up, and the third will display the number rounded down. Problem Statement Write a Java program to display a table with columns in the output using Formatter. Input double arr[] = { 1.7, 2.5, 3.1, 4.5, 5.7, 6.9, 7.7, 8.9, 9.1 }; Output The point list... Points1 Points2 Points3 1.70 2.00 1.00 2.50 ...
Read MoreJava program to reverse an array upto a given position
In this article, we will reverse the elements of an array up to a specified position using Java. You will learn how the program takes an array, reverses the first part of it up to a given index, and prints the modified array. An array can be reversed upto the given position pos and the remaining array is unchanged.Problem Statement Write a Java program to reverse an array upto a given position.Input Array = 1 2 3 4 5 6 7 8 9 10 Position = 6 Output Modified array is: 6 5 4 3 2 1 7 8 9 ...
Read MoreJava program to remove path information from a filename returning only its file component
In this article, we will learn to remove path information from a filename returning only its file component using Java. The method fileCompinent() is used to remove the path information from a filename and return only its file component. This method requires a single parameter i.e. the file name and it returns the file component only of the file name. Problem Statement Write a program in Java to remove path information from a filename returning only its file component − Input "c:\JavaProgram\demo1.txt" The input is the file path. Output demo1.txt Steps to remove path information Following are the steps to remove ...
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