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Page 363 of 589
Java Program to add Combo Box to JTable
In this article, we will learn how to add a JComboBox to a JTable in Java Swing. The JComboBox allows you to create a drop-down list within a table cell, enabling users to select from predefined options. Steps to add a combo box to JTable Following are the steps to add a combo box to JTable − First import the necessary packages. Initialize a JTable with 5 rows and 5 columns. Create a JComboBox and add items to it. Get the first column of ...
Read MoreBasic calculator program using Java
In this article, we will learn to create a basic calculator using Java. With a basic calculator, we can add, subtract, multiply, or divide two numbers. This is done using a switch case. A program that demonstrates this is given as follows − Problem Statement Write a program in Java to create a basic calculator for performing the basic arithmetic operations − Input Enter two numbers: 23Enter an operator (+, -, *, /): + Output The result is given as follows:2.0 + 3.0 = 5.0 Steps to create basic calculator Following are the steps to create a basic calculator program using ...
Read MoreJava program to find the smallest missing number
The smallest missing number is the smallest number that is missing from a stream of elements or in an Array. The stream may or may not contain continuous elements. If the stream is continuous then the smallest missing number is nothing but the Smallest Missing Number in a stream. In this section, we will discuss the various approaches to find a Smallest Missing Number in a stream of elements using Java programming language. Problem Statement Given a stream of integers find the smallest missing number from the stream. Input 1 arr=[1, 2, 3, 5, 6, 7, 8] Output 1 ...
Read MoreJava program to print all unique words of a string
In this article, we will learn to find unique words in a string using the Map utility of Java because of its property that it does not contain duplicate keys. To find unique words first get all words in the array to compare each word, for this split string based on space/s. If other characters such as comma(, ) or full stop (.) are present then using required regex first replace these characters from the string. Insert each word of string as the key of Map and provide the initial value corresponding to each key as is unique if this ...
Read MoreJava program to swap two integers
In this article, we will learn to swap two numbers using Java. We will use the Scanner class to get the user input and perform the swapping temporary variable. Read integers from users using the nextInt() method of the Scanner class. Steps to swap two integers Following are the steps to swap two numbers in Java− Import the Scanner class. Create a variable (temp), and initialize it with 0. Assign 1st number to temp. Assign the 2nd number to the 1st number. ...
Read MoreJava Program to Get the First Element from LinkedHashSet
LinkedHashSet is a class provided by Java that implements Set Interface. The first element of a LinkedhashSet is nothing but the first element in the collection. In this article, we will discuss different approaches to get the first element from LinkedHashset. What is a LinkedHashSet? A LinkedHashSet is a collection which is a combination of HashSet collection and a LinkedList collection. A HashSet is an unordered collection which doesn't allow duplicates. But, a LinkedList is an ordered collection which stores duplicates Coming to LinkedHashSet as it is a combination of both HashSet and LinkedList it stores the elements in ...
Read MoreJava Program to Find All Palindromic Sub-Strings of a String
In this problem, we are given a String and our task is to find all palindromic sub-strings of the specified length. There are two ways to solve the problem. The first way is to compare the characters of sub-string from start to last, and another way is to reverse the sub-string and compare it with the original sub-string to check whether it is palindrome. String in Java is a class which represents a sequence of characters. It is immutable which means once it is created a String object cannot be changed. And, sub-string is a small portion or part of ...
Read MoreJava Program to Display Numbers and Sum of First N Natural Numbers
Natural numbers are all positive integers or whole numbers that range between 1 to infinity. In this article, we will see how to find the sum of the first N natural numbers in Java, where N is the integer up to which we need to add all the numbers starting from 1. Example Scenario: Input: num = 5 Output: sum = 15 sum = 1 + 2 + 3 + 4 + 5 Using a for loop In this approach, initialize a variable with 0 to store the sum. Then, run a for loop that goes from ...
Read MoreJava program to find common elements in three sorted arrays
The common elements in three sorted arrays are those elements that occur in all three of them. In this article, we will learn how to find common elements from three sorted arrays in Java. An example of this is given as follows − Example Scenario: Input 1: arr1 = [1, 3, 5, 7, 9] Input 2: arr2 = [2, 3, 6, 7, 9] Input 3: arr3 = [1, 2, 3, 4, 5, 6, 7, 8, 9] Output: Common elements = 3 7 9 Here, arrays are data structure which stores a fixed-size sequential collection of elements of the same ...
Read MoreJava program to multiply given floating point numbers
Suppose two floating point numbers are given as operands and your task is to write a Java program to multiply the given numbers. To perform this operation, initialize two float values, multiply and store the result in another float type variable. Float is a datatype in Java which stores numbers with fractional part. Example Scenario: Input 1: num1 = 1.2 Input 2: num2 = 1.4 Output: product = 1.68 Using Multiplication Operator The multiplication operator is represented by asterisk sign (*). It is categorized under arithmetic operator in Java. It can be used to multiply float values ...
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