How to get the Index of Specified Element in a List in Java - Step by Step Examples

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How to get the Index of Specified Element in a List in Java ?

Answer

To find the index of a specified element in a list in Java, you can use the indexOf method of the List interface.

✐ Examples

1 Find Index of Element in List

In this example,

We create a list named myList with some elements using the Arrays.asList method.
We use the indexOf method of the list object myList to find the index of a specific element.
The indexOf method returns the index of the first occurrence of the element in the list, or -1 if the element is not found.
Finally, we print the index to standard output.

Java Program

import java.util.*;

public class Main {
    public static void main(String[] args) {
        List<Integer> myList = Arrays.asList(10, 20, 30, 40, 50);
        int index = myList.indexOf(40);
        System.out.println("Index of element is: " + index);
    }
}

Output

Index of element is: 3

2 Find Index of String in List

In this example,

We create a list named myList with some string elements using the Arrays.asList method.
We use the indexOf method of the list object myList to find the index of a specific string.
The indexOf method returns the index of the first occurrence of the string in the list, or -1 if the string is not found.
Finally, we print the index to standard output.

Java Program

import java.util.*;

public class Main {
    public static void main(String[] args) {
        List<String> myList = Arrays.asList("apple", "banana", "cherry", "date", "elderberry");
        int index = myList.indexOf("cherry");
        System.out.println("Index of element is: " + index);
    }
}

Output

Index of element is: 2

Summary

In this tutorial, we learned How to get the Index of Specified Element in a List in Java language with well detailed examples.

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How to get the Index of Specified Element in a List in Java - Step by Step Examples

How to get the Index of Specified Element in a List in Java ?

Answer

✐ Examples

1 Find Index of Element in List

Java Program

Output

2 Find Index of String in List

Java Program

Output

Summary

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