Write to file in Java

This tutorial would be focusing on different ways of write to file using Java. Stream is a general mechanism of I/O in java. Stream provides sequential access of data. An input stream can be used by an application to read data. An output stream to write data. A file, network connection, arrays can act as […]

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how hashmap works java

HashMap in Java

What is Hashing? Hashing is a mechanism to convert one value to another. The process which performs this transformation is called the ‘Hash Function’. The input to the hash function is normally called as the ‘Key’ and this could be any value which can be converted to a String. The output or the hashed value […]

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Convert a string representing a duration, ie: 300ms, 20s, etc to to nanoseconds

Suppose you have a string in your application that has the duration of time using ns, us ms , s h, d. And you want to convert them all to nano seconds, then utility will of great help to you.

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Longest Palindromic Subsequence – Leetcode Java

Given a string s, find the longest palindromic subsequence’s length in s. You may assume that the maximum length of s is 1000. Example 1: Input:

Output:

One possible longest palindromic subsequence is “bbbb”. Example 2: Input:

Output:

One possible longest palindromic subsequence is “bb”. Java Solution

  You can […]

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