Question

state the purpose and return data type of index of and compare to​

Answer 1

Explanation:

The java string indexOf() method returns index of given character value or substring. If it is not found, it returns -1. The index counter starts from zero.

Internal implementation

public int indexOf(int ch) {

return indexOf(ch, 0);

}

Signature

There are 4 types of indexOf method in java. The signature of indexOf methods are given below:

No. Method Description

1 int indexOf(int ch) returns index position for the given char value

2 int indexOf(int ch, int fromIndex) returns index position for the given char value and from index

3 int indexOf(String substring) returns index position for the given substring

4 int indexOf(String substring, int fromIndex) returns index position for the given substring and from index