编辑器
import java.util.ArrayList; public class Main { public static void main(String[] args) { ArrayList<String> cars = new ArrayList<String>(); cars.add("Volvo"); cars.add("Ford"); cars.add("BMW"); cars.add("Ford"); cars.add("Mazda"); System.out.println(cars.indexOf("Ford")); System.out.println(cars.lastIndexOf("Ford")); } }
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编辑器