Vector: indexOf(Object o, int index)
import java.util.Vector;
public class Main {
public static void main(String[] args) {
Vector<String> v = new Vector<String>();
v.add("1");
v.add("2");
v.add("3");
v.add("4");
v.add("5");
v.add("1");
v.add("2");
System.out.println(v.indexOf("1", 4));
System.out.println(v.lastIndexOf("2", 5));
}
}
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