Java AbstractCollection类的containsAll()方法
该containsAll()方法检查指定集合中的所有元素。如果此集合具有所有元素，则返回TRUE。方法逐个检查每个元素，以查看它是否包含在此集合中。
语法如下-
public boolean containsAll(Collection<?> c)
要使用Java中的AbstractCollection类，请导入以下包-
import java.util.AbstractCollection;
以下是containsAll()在Java中实现AbstractCollection方法的示例-
示例
import java.util.ArrayList;
import java.util.AbstractCollection;
public class Demo {
public static void main(String[] args) {
AbstractCollection<Object> absCollection1 = new ArrayList<Object>();
absCollection1.add("These");
absCollection1.add("are");
absCollection1.add("demo");
absCollection1.add("elements");
System.out.println("AbstractCollection1: " + absCollection1);
AbstractCollection<Object> absCollection2 = new ArrayList<Object>();
absCollection2.add("These");
absCollection2.add("are");
absCollection2.add("demo");
absCollection2.add("elements");
System.out.println("AbstractCollection2: " + absCollection2);
System.out.println("Is both the collection having identical elemenst? " + absCollection1.containsAll(absCollection2));
}
}输出结果
AbstractCollection1: [These, are, demo, elements] AbstractCollection2: [These, are, demo, elements] Is both the collection having identical elemenst? true