2. HowTo
3. Java Howtos

Java String

• Perform String to String Array Conversion in Java
• Remove Substring From String in Java
• Convert Byte Array in Hex String in Java
• Convert Java String Into Byte
• Generate Random String in Java
• The Swap Method in Java
• Convert String to Int Array in Java
• Save a String to a File in Java
• Get Word Count of a String in Java
• Parse a String in Java
• Convert Float to String and String to Float in Java
• Convert Object to String in Java
• Print New Line in Java
• Split a String by Space in Java
• Concatenate Strings in Java
• Escape Characters in Java
• Boolean to String in Java
• Count Characters in a String in Java
• Enum to String in Java
• Iterate Over Characters of String in Java
• Replace Character in String in Java
• Replace Multiple Characters in String in Java
• String to Boolean in Java
• Add Char to String in Java
• Convert Binary String to Int in Java
• Get the Last Character of a String in Java
• Print Quotation Marks in Java
• Replace Character in String at Index in Java
• Remove a Character From String in Java
• Do String Interpolation in Java
• Multiply Strings in Java
• Convert String to InputStream in Java
• Convert String to JSON Object in Java
• Convert an InputStream Into a String in Java
• Sort a String in Java
• Get the Length of a 2D Array in Java
• Split String to Array in Java
• Reverse a String in Java
• Check if a String Contains Character in Java
• Convert Byte Array to String in Java
• Convert String to Date in Java
• Capitalize the First Letter of a String in Java
• Convert an Arraylist to a String in Java
• Remove the Last Character From the String in Java
• Check if a String Is an Integer in Java
• Check if a String Is Empty or Null in Java
• Convert Date to String in Java
• Convert a String to an Int in Java
• Convert a Char to a String in Java
• Convert a String to Char in Java
• Convert a String to Long in Java
• Convert String Date to Timestamp in Java
• Remove Punctuation From String in Java
• Convert an Integer to a String in Java
• Remove Whitespace From String in Java
• Check Whether a String Contains a Substring in Java
• Convert String to Double in Java
• Read a File to a String in Java
• Check if a String Is a Number in Java
• Split a String in Java

Java ArrayList

• Sort Objects in ArrayList by Date in Java
• Deep Copy ArrayList in Java
• Convert Int Array to Arraylist in Java
• Copy ArrayList in Java
• Initialize ArrayList in Java
• Print an ArrayList in Java
• Create a 2D ArrayList in Java
• Convert an Arraylist to a String in Java
• Create ArrayList From Array in Java

Java Sorting

• Sort Objects in ArrayList by Date in Java

Java Array

• Concatenate Two Arrays in Java
• Convert Byte Array in Hex String in Java
• Convert String to Int Array in Java
• Check If Array is Empty in Java
• Convert Int Array to Arraylist in Java
• Initialize 2D Array in Java
• Copy Array in Java
• Java Array Indexof
• Return Array in Java
• Return Empty Array in Java
• Sort 2D Array in Java
• Swap Arrays in Java
• Check if an Array Contains Int in Java
• Convert Char Array to Int in Java
• Get Char Array's Length in Java
• Print 2D Array in Java
• Initialize an Empty Array in Java
• Print an Array in Java
• Get Length of Array in Java
• Convert List to Array in Java
• Initialize a String Array in Java
• Sort Array Elements in Java
• Reverse an Int Array in Java
• Create ArrayList From Array in Java
• Convert Integer List to Int Array in Java
• Convert an Array to a List in Java
• Check Whether an Array Is Null/Empty in Java
• Initialize an Array in Java
• Add New Elements to an Array in Java

Java Byte

• Convert Java String Into Byte

Java DateTime

• Add One Day to a Date in Java
• Compare Two Dates in Java
• Get Current TimeStamp in Java Date
• Get Year From Date in Java
• java.util.date to java.sql.date in Java
• Get Today's Date in Java
• Subtract Dates in Java
• Convert String to Timestamp in Java
• Convert String to DateTime Object in Java
• Get the Current Date-Time in Java
• Convert Date to String in Java
• Convert String Date to Timestamp in Java

Java Int

• Convert Int to Char in Java
• Convert Int to Double in Java
• Calculate Power of Integers in Java
• Convert Double to Int in Java
• Convert Char Array to Int in Java
• Convert Binary String to Int in Java
• Java Convert Hex String to Int
• Check if a String Is an Integer in Java
• Convert Char to Int in Java
• Convert Long to Int in Java
• Convert Integer List to Int Array in Java
• Get the Separate Digits of an Int Number in Java
• Convert an Integer to a String in Java

Java Char

• Convert Int to Char in Java
• Empty Character Literal in Java
• Char to Uppercase/Lowercase in Java
• Check if a Character Is Alphanumeric in Java
• Compare Characters in Java
• Generate Random Character in Java
• Get a Char From the Input in Java
• Count Characters in a String in Java
• Iterate Over Characters of String in Java
• Replace Character in String in Java
• Add Char to String in Java
• Get the Last Character of a String in Java
• Replace Character in String at Index in Java
• Remove a Character From String in Java
• Convert an ASCII Code to Char
• Convert Char to Int in Java
• Convert Character to ASCII Numeric Value in Java
• Convert a Char to a String in Java
• Convert a String to Char in Java

Java File

• Remove Line Breaks Form a File in Java
• Save a String to a File in Java
• How to Read XML File in Java
• Check if a File Exists in Java
• Get the File Extension of a File in Java
• Get the Current Working Directory in Java
• Read All Files of a Folder in Java
• Convert File to a Byte Array in Java
• Read a Large Text File Line by Line in Java
• Create a File and Write Data to It in Java
• Read a File to a String in Java

Java Double

• Convert Int to Double in Java
• Truncate Double in Java
• Format Double Value in Java
• Convert Double to Int in Java
• Round a Double to Two Decimal Places in Java
• Convert String to Double in Java

Java Media

• Play Sound in Java

Java Function

• Return a Boolean Method in Java
• Pass a Function as a Parameter in Java

Java Integer

• Check if Input Is Integer in Java
• Integer Division in Java

Java Print

• Print New Line in Java

Empty Array

• Check If Array is Empty in Java

Java int

• Compare two integers in Java
• Convert a String to an Int in Java

compare integers

• Compare two integers in Java

Java Map

• Difference between hashmap and map in Java
• Sort a Map by Value in Java
• Get Key From Value in Java Hashmap
• Convert JSON to Map in Java
• Iterate Over Each Element of Map in Java

Java HashMap

• Difference between hashmap and map in Java
• Difference between hashtable and hashmap in Java
• Update Value in Hashmap in Java
• Iterate Through HashMap in Java
• Get Keys From HashMap in Java
• Print HashMap in Java

Java Hashtable

• Difference between hashtable and hashmap in Java

Java Encryption

• Encrypt Password in Configuration Files in Java

Java Class

• How to import custom class in Java
• Call a Variable From Another Method in Java

Java List

• Iterate Through a Linked List in Java
• Iterate Through List in Java
• Initialize List of String in Java
• Print List in Java
• Convert Integer List to Int Array in Java
• Convert an Array to a List in Java
• Join Two Lists in Java
• Create a New List in Java

Java parameters

• Java Default Parameters

Java Method

• args parameter in Java
• Call a Variable From Another Method in Java
• Call a Method in Another Class in Java

Java GUID

• Create GUID in Java

Java Statement

• Java One Line if Statement

Java Math

• Recursive Fibonacci Sequence in Java
• Calculate Power of Integers in Java
• Generate Random Number Within a Specified Range in Java
• Infinity in Java
• Do Power in Java

Java Float

• Convert Float to String and String to Float in Java
• Print a Float With 2 Decimal Places in Java

Java Object

• Convert Object to String in Java
• Check if an Object Is Null in Java
• Delete an Object in Java

Java Thread

• Daemon Thread in Java
• Get Thread Id in Java
• Kill Thread in Java

Java Collections

• Implement Key Value Pair in Java

Java Variable

• Create Global Variable in Java
• Initialize Multiple Variables in Java

Java Scope

• Create Global Variable in Java

Java Operator

• Difference Between i++ and ++i Operators in Java
• Question Mark and Colon in Java

Java Number

• Generate Random Number Within a Specified Range in Java
• Round Up A Number in Java
• Generate a Random Number Between 1 and 10 in Java

Java Path

• Relative Path in Java

Java IO

• Relative Path in Java
• Convert Inputstream to Byte Array in Java
• Convert an InputStream Into a String in Java
• Get the File Extension of a File in Java
• Read All Files of a Folder in Java

Java Algorithm

• Java Binary Search Interactive and Recursive
• Java Binary Search

Java Constructor

• Call Another Constructor in Java

Java Graphics

• Draw a Circle in Java
• Draw a Triangle in Java

Java AWT

• Draw a Triangle in Java

Java Switch

• Switch on Enum in Java

Java Enum

• Switch on Enum in Java
• Enum to String in Java

Java Scanner

• Get a Char From the Input in Java
• Clear Scanner in Java
• Close a Scanner in Java

Java Boolean

• Boolean to String in Java
• String to Boolean in Java

java Arraylist

• Initialize List of String in Java

Java Set

• Iterate Through Set in Java

Java InputStream

• Convert String to InputStream in Java

Java JSON

• Convert String to JSON Object in Java
• Convert JSON to Map in Java
• Convert Hashmap to JSON Object in Java

Java Hex

• Java Convert Hex String to Int

Java Loop

• Java for Loop With Two Variables

Java Console

• Clear the Console in Java
• Get Input From the Console in Java

Java CSV

• Parse CSV in Java

Java ASCII

• Convert an ASCII Code to Char
• Convert Character to ASCII Numeric Value in Java

Java Input

• Get User Input in Java

Java Multithreading

• Delay Few Seconds in Java

Java Data Type

• Check Type of a Variable in Java

Java Hashmap

• Get Key From Value in Java Hashmap
• Convert Hashmap to JSON Object in Java

Java Long

• Convert a String to Long in Java

Java Collection

• Iterate Over Each Element of Map in Java