Program
import java.util.ArrayList;
import java.util.LinkedList;
public class ArrayListGetIndexOf {
public static void main(String[] args) {
// TODO Auto-generated method stub
ArrayList<String> a1 = new ArrayList<String>();
a1.add("runnable");
a1.add("start");
a1.add("sleep");
a1.add("setname");
a1.add("join");
a1.add("run");
a1.add("start");
a1.add("run");
String s1 ="java class in chrompet";
int index = s1.indexOf("e");
System.out.println("position of char:" +index);
System.out.println(a1.get(2));
System.out.println(a1.get(0));
System.out.println(a1.get(5));
System.out.println("Index of : "+a1.indexOf("one"));
System.out.println("Index of : "+a1.indexOf("run"));
System.out.println("Index of : "+a1.indexOf("sleep"));
System.out.println("Last index of : "+a1.lastIndexOf("run"));
System.out.println("Last index of : "+a1.lastIndexOf("setname"));
System.out.println("Last index of : "+a1.lastIndexOf("start"));
}
}Output
position of char:20 sleep runnable run Index of : -1 Index of : 5 Index of : 2 Last index of : 7 Last index of : 3 Last index of : 6
Description
public E get(int index)
Reads the char at current position
Returns the element at the specified position in this list.Specified by:
get in interface List <E>
Specified by:
get in class AbstractList<E>
Parameters:
index – index of the element to return
Returns:
the element at the specified position in this list
Throws:
IndexOutOfBoundsException – if the index is out of range (index < 0 || index >= size())
public int indexOf(Object o)
Returns the index of the first occurrence of the specified element in this list,
or -1 if this list does not contain the element.
More formally, returns the lowest index i such that Objects.equals(o, get(i)),
or -1 if there is no such index.
Specified by:
indexOf in interface List<E>
Overrides:
indexOf in class AbstractList<E>
Parameters:
o – element to search for
public int lastIndexOf(Object o)
Returns the index of the last occurrence of the specified element in this list,
or -1 if this list does not contain the element. More formally, returns the
highest index i such that Objects.equals(o, get(i)), or -1 if there is no such index.
Specified by:
lastIndexOf in interface List<E>
Overrides:
lastIndexOf in class AbstractList<E>
Parameters:
o – element to search for
Returns:
the index of the last occurrence of the specified element in this list,
or -1 if this list does not contain the element
