There are four ways to find string substrings in Java (indexof ())

There are four ways to find string substrings in Java (indexof ())

There are four ways to find string substrings in Java, as follows:
1, int indexOf (String str): Returns the index of the first occurrence of the specified substring in this string.
2, int indexOf (String str, int startIndex): Returns the index of the first occurrence of the specified substring in this string, starting at the specified index.
3, int lastIndexOf (string str): Returns the index of the specified substring that appears rightmost in this string.
4, int lastIndexOf (String str, int startIndex): Searches backward at the specified index, returning the index of the specified substring that last occurred in this string.

IndexOf () Usage note
IndexOf ()

Returns the character position of a substring within a string object for the first time.

String.IndexOf (substring[, StartIndex])

Parameters
String

Required option. A String object or literal.

subString required option.

The substring to find in the string object.

Starindex options available.

The integer value that indicates the index at which to start the lookup within a String object. If omitted, it is searched from the beginning of the string.

Description
The IndexOf method returns an integer value that indicates the starting position of the substring in the string object. If no substring is found, 1 is returned.

If the startindex is negative, then startindex is treated as zero. If it is larger than the maximum character position index, it is treated as the largest possible index.

Performs a lookup from left to right. Otherwise, the method is the same as lastIndexOf.

Example
The following example illustrates the use of the IndexOf method.

function Indexdemo (str2) {
var str1 = "Babebibobubabebibobu"
var s = str1.indexof (STR2);
return (s);
}

PublicClassFirstdemo {/** *api a common method of string in *///< Span style= "color: #008000;" > find if the specified string exists public static void main (string[] args) {String str1 = " Abcdefghijklmnabc "; ////// 

There are four ways to find string substrings in Java (indexof ())