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setindex.java

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import java.util.ArrayList;

class Main {

public static void main(String[] args) {

ArrayList<String> cars = new ArrayList<String>();

cars.add("Volvo");

cars.add("BMW");

cars.add("Ford");

cars.add("Mazda");

cars.set(0, "Opel");//thats set 0 index

System.out.println(cars);

}

}