String method- indexof

indexof method is used to find out the index of a particular character or Substring into the String.

It has 4 type of different signatures.

  1. int indexOf(int ch)
  2. int indexOf(String str)
  3. int indexOf(int ch,int fromIndex)
  4. int indexOf(String str, int fromIndex)

We should know that index starts from number 0. Let’s see their implementation with examples.

int indexOf(int ch):

It returns the index of the first occurrence of character ch in a String.

Output: index of char ‘e’ : 1

 

int indexOf(String str):

Returns the index of a substring in a String. We are searching the index of substring ‘World’ in a string ‘Hello World’.

Output: index of char ‘World’ : 6

 

int indexOf(int ch,int fromIndex):

It returns the index of first occurrence of character ch, starting from the specified index “fromIndex”. In the below example, we are finding the character ‘W’ in the String.

Output: index of char ‘W’ ,start from 4th position : 6

 

int indexOf(String str, int fromIndex):

Returns the index of string str, starting from the specified index “fromIndex”.

Output: index of String ‘Hello’ ,start from 2nd position : 4
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Shekhar Sharma

Shekhar Sharma

Shekhar Sharma is founder of testingpool.com. He is an automation engineer having more than 8 years of experience who loves troubleshooting in automation and finding innovative ways to solve the problems. His other leisurely activities includes playing harmonica, paintings, sketching portrait, watching movies and travelling etc.

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1 Response

  1. August 6, 2015

    […] indexOf(String str, int fromIndex) […]