String methods – isEmpty() and lastIndexof

In this post, we will discuss about 2 methods which are isEmpty and lastIndexOf.

Let’s understand them with examples.

boolean isEmpty():

Returns true , if length of the string is 0.


lastIndexOf():

This method finds out the index of last occurrence of a char/sub-string in a particular String.

It has 4 types of implementations.

int lastIndexOf(int ch): It returns the last occurrence of character ch in the particular String.

int lastIndexOf(int ch, int fromIndex): It returns the last occurrence of ch, starting searching backward from the specified index “fromIndex”.

int lastIndexOf(String str): Returns the last occurrence of str in a String.

int lastIndexOf(String str, int fromIndex): Returns the last occurrence of str, starting searching backward from the specified index “fromIndex”.

Output: Last occurence of string COM :12
Last occurence of char C :12
Last occurence of char G, index start from 10 :6
Last occurence of string Pool,index starts from 10 :7
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Shekhar Sharma

Shekhar Sharma

Shekhar Sharma is founder of testingpool.com. This website is his window to the world. He believes that ,"Knowledge increases by sharing but not by saving".

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