Java中的CopyOnWriteArrayList的contains()方法
在contains()的CopyOnWriteArrayList类的方法被用于获得指定的元素。如果该元素在列表中，则返回TRUE，否则返回FALSE。
语法如下
boolean contains(Object ob)
在这里，ob是要检查存在性的元素。要使用CopyOnWriteArrayList类，您需要导入以下包
import java.util.concurrent.CopyOnWriteArrayList;
以下是contains()在Java中实现CopyOnWriteArrayList类方法的示例
示例
import java.util.concurrent.CopyOnWriteArrayList;
public class Demo {
public static void main(String[] args) {
CopyOnWriteArrayList<Integer> arrList = new CopyOnWriteArrayList<Integer>();
arrList.add(100);
arrList.add(250);
arrList.add(400);
arrList.add(500);
arrList.add(650);
arrList.add(700);
arrList.add(800);
System.out.println("CopyOnWriteArrayList Elements = " + arrList);
System.out.println("The element at 2nd position = " + arrList.get(1));
System.out.println("Does the element exist in the List? = " + arrList.contains(400));
}
}输出结果
CopyOnWriteArrayList Elements = [100, 250, 400, 500, 650, 700, 800] The element at 2nd position = 250 Does the element exist in the List? = true