Stack indexOf(Object, int) method in Java with Example
The Java.util.Stack.indexOf(Object element, int index) method is used to the index of the first occurrence of the specified element in this Stack, searching forwards from index, or returns -1 if the element is not found. More formally, returns the lowest index i such that (i >= index && Objects.equals(o, get(i))), or -1 if there is no such index.
public int indexOf(Object element, int index)
Parameters: This method accepts two parameters:
- element of the type of Stack. It specifies the element whose occurrence is needed to be checked in the Stack.
- index of the type Integer. It specifies the index to start searching from
Return Value: This method returns the index or position of the first occurrence of the element in the Stack from the specified index. Else it returns -1 if the element is not present in the Stack. The returned value is of integer type.
Exception: This method throws IndexOutOfBoundsException if the specified index is negative.
Below programs illustrate the Java.util.Stack.indexOf() method:
Stack: [Geeks, for, Geeks, 10, Geeks] The first occurrence of Geeks is at index:0 The second occurrence of Geeks is at index: 0
Program 2: To demonstrate IndexOutOfBoundsException
Stack: [1, 2, 3, 10, 20] The -1 occurrence of Geeks is at index: java.lang.ArrayIndexOutOfBoundsException: -1
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