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How to find the index of given element of a Java List?
The indexOf(Object) method of the java.util.ArrayList class returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element. Using this method, you can find the index of a given element.
Example
import java.util.ArrayList; public class ArrayListDemo { 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"); System.out.println("Size of list: " + arrlist.size()); for (String value : arrlist) { System.out.println("Value = " + value); } int retval=arrlist.indexOf("E"); System.out.println("The element E is at index " + retval); } }
Output
Size of list: 4 Value = G Value = E Value = F Value = M The element E is at index 1
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