🎯10 most useful string methods in Java
String is an object that represents sequence of char values. Strings are immutable in Java.There are two ways to create string in Java
1 - By String literal
2 - By new keyword
📌Note: String literal create no new object if it exists already in the string constant pool (SCP) which is a special place for all strings in heap memory. Create string of same object using new keyword.This will create new object outside the string pool if it already exist in it
1 - indexOf() use to find characters and substrings in a string. It returns the index of first occurrence from left of the passed string or character
syntax - public int indexOf​(String str, int fromIndex)
str - substring to be search
fromIndex - search begin from this index
2 - toCharArray() used to form a character array of a string
syntax - public char[] toCharArray()

▶️Example : check if string is palindrome of not
3 - charAt() Used to find the character at particular index
syntax - public char charAt​(int index)

▶️ Example : count no. of spaces in the string
4 - concat() Used to concatenate two strings
syntax - public String concat(String str)

▶️ Example : concatenate last name and firstname
5 - replace() Used for replacing characters and substrings in a string
syntax - public String replace​(char oldChar, char newChar)

▶️ Example : remove all white spaces from the string
6 - substring() Used to extract a portion of a string from original string
syntax - public String substring​(int beginIndex, int endIndex)

▶️Example : print first 3 character of a string
7 - split() Used to breaks a given string around matches of the given regular expression.After splitting against the given regular expression, this method returns a char array
syntax - public String[] split​(String regex, int limit)
limit : number of strings return after split
8 - compareTo() It compares the given string with the current string lexicographically. It returns a positive number, negative number, or 0
if s1 > s2, returns +ve number
if s1 < s2, returns -ve number
if s1 == s2, returns 0
syntax : public int compareTo(String anotherString)
9 - strip() To eliminate all trailing and leading whitespaces from the given string
syntax - public String strip()
▶️ Example
10 - valueOf() Used to return string representation of passed argument
syntax - public static String valueOf​(char[] data)
Note : valueOf() has many overloaded variants that aid in the conversion of almost any primitive form to string

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More from @Pankaj_SinghR

Jan 22, 2022
🎯Objects in JavaScripts
#programming #webdeveloper #javascript #100DaysOfCode
A thread 🧵
In simple words objects is the collection of name-value pairs. Objects is JavaScript are same as dictionaries in Python , hashtable in c and c++ and hashmap in Java.
The "name" part is a JavaScript string, while the value can be any JavaScript value
There are two ways of creating the object
1 - using object literal (more convenient)
2 - using new keyword
👇
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Jan 14, 2022
🎯 Type Coercion in JavaScript
A Thread 🧵
Type Coercion is process of automatic or implicit conversion of value from one data type to another. Conversion from Number to String , String to Number, Boolean to Number and so on. Type coercion occurs when different types of operators are applied to the values.
▶️Number to String : Anything added to string first JavaScript convert it into string and then concatenates both the strings.
Note : If occur only with "+" operator Image
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