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The problem statement states that we have given a String str of length N (where N is an integer) containing alphanumeric characters. We need to recursively remove all adjacent duplicate characters so that the resultant string does not contain any adjacent duplicate characters. We can use a recursive or iterative approach to solve the problem. Here, we first remove the adjacent duplicate elements from the left part of the string. After that, we recursively remove the adjacent duplicates from the right part of the string. Example Scenario 1: Input: str1 = "tuttor"; Output: res = tuor The adjacent duplicate ... Read More
The Calendar class of java.util package provides a method with the name add(). This method accepts current date and amount of time as parameter values. If the given amount of time is positive, it will add it to the current date, and in the case of negative time, it will subtract it. In this article, we will see a few Java programs to add year to the current date using the Calendar.add() method. Example Scenario: Input 1: current_date = Thu Nov 22 18:19:06 UTC 2018 Input 2: year_to_add = 12 Output: new_date = Thu Nov 22 18:19:06 UTC 2030 ... Read More
Both StringTokenizer class and the split() method in Java are used to divide a string into tokens or substrings. However, they are different from each other. The StringTokenizer class does not support regular expressions, whereas the split() method works with regular expressions. In this article, we will see some Java examples that show how to split strings using them. Example Scenario: Input: str = "simple easy learning" Output: split_str = "simple", "easy", "learning" Splitting String using StringTokenizer Class The StringTokenizer is a legacy class of java.util package. This class provides methods to break a string into multiple tokens. It ... Read More
The atoi() function is used in C programming language and used to convert the string which is passed as the parameter to it into an integer value if the string is a valid integer otherwise it shows the undefined behavior. We will implement the atoi() function in the Java programming language. Example Scenario 1: Input: string str = "123" Output: res = 123 We are given a string that represents a number so we have just got the same output. Example Scenario 2: Input: string str = "897c7" Output: res = Invalid Input The given string ... Read More
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 More
On clearing the StringBuffer object, all the characters from the buffer will be removed. In this article, we will write Java program to clear the StringBuffer. StringBuffer is a peer class of String that provides much of the functionality of strings. But, String represents fixed-length, immutable character sequences while StringBuffer represents mutable character sequences. Example Scenario: Input: obj = Java Program Output: res = The result will be an empty StringBuffer object. Using delete() method The StringBuffer class of java.lang package provides a method named delete() to clear the StringBuffer. This method accepts start and end indices ... Read More
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 More
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 More
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 ... Read More
Some applications that work on calendars require a day name to be displayed for features like scheduling tasks, events or reminders. For this purpose, Java provides various built-in classes and methods including LocalDate, Calendar and SimpleDateFormat. In this article, we will learn how to use these classes and methods in Java programs to find the day name of a week for a given date. Using LocalDate Class In this approach, we first find current date using LocalDate class and using its built-in method named getDayOfWeek(), we create a DayOfWeek Enum which can be converted to String to display day ... Read More