Java ArrayList.indexOf(Object o)
Syntax
ArrayList.indexOf(Object o) has the following syntax.
public int indexOf(Object o)
Example
In the following code shows how to use ArrayList.indexOf(Object o) method.
//w w w . jav a 2 s . co m
import java.util.ArrayList;
public class Main {
public static void main(String[] args) {
ArrayList<String> arrlist = new ArrayList<String>(5);
arrlist.add("G");
arrlist.add("E");
arrlist.add("F");
arrlist.add("M");
arrlist.add("from java2s.com");
System.out.println("Size of list: " + arrlist.size());
System.out.println(arrlist);
// retrieving the index of element "E"
int retval = arrlist.indexOf("E");
System.out.println("The element E is at index " + retval);
}
}
The code above generates the following result.
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