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Java List indexOf() Method
The indexOf() method of List interface returns the index of the first occurrence of the specified element in this list. It returns -1 if the specified element is not present in this list.
Syntax
Parameters
The parameter ‘o’ represents the element to be searched.
Throws:
ClassCastException– If the type of the specified element is not compatible with this list.
NullPointerException– If the specified element is null and this list does not allow null elements.
Return
The indexOf() method returns the index of the first occurrence of the specified element if it is present in this list, else it returns -1.
Example 1
Output:
Element stored at index 0 : 0 Element stored at index 1 : 1 Element stored at index 2 : 2 Element stored at index 3 : 3 Element stored at index 4 : 4 Element stored at index 5 : 5
Example 2
Output:
Element stored at Index 90 : -1
Example 3
Output:
Element stored at null : -1
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