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