Category: Java Interview Question
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Intro Dates in programming are hard. The ISO-8601 Date standard made them easier, but to be entirely honest I’m not ISO-8601 Certified, so I’m not very good at my job. What I do know though is the very important difference between YYYY and yyyy when formatting dates. The Difference between yyyy and YYYY According to the DateTimeFormatter Java…
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This tutorial shows you how to replace multiple consecutive characters with single character. Consider we have an input as: String str = “%%New%%%%”; Here, there are multiple consecutive occurrence of % character and we can replace its each set of consecutive occurrence as shown below: str = str.replaceAll(“(.)\\1+”,”$1″); So, after performing the above replace operation,…
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Autoboxing is an automatic conversion of a primitive type into its corresponding wrapper class object by the java compiler. For an example, converting an int to an Integer. Consider the following example: int i = 10; Integer j = i; Here, Integer j expects wrapper class of Integer object, but even though if we assign…
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Question: Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. There is only one repeated number in nums, return this repeated number. You must solve the problem without modifying the array nums and uses only constant extra space. Example 1: Input: nums =…
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A Stream in Java can be defined as a sequence of elements from a source. The source of elements here refers to a Collection or Array that provides data to the Stream. Java streams are designed in such a way that most of the stream operations (called intermediate operations) return a Stream. This helps to create a chain of stream operations. This is…