import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
public class MainClass {
public static void main(String[] a) {
String elements[] = { "A", "B", "C", "D", "E" };
Set set = new HashSet(Arrays.asList(elements));
System.out.println(set.contains("A"));
}
}
运行结果如下:
the containsAll() method checks if a set contains another whole collection
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
/*from w w w. java 2 s . co m*/
public class MainClass {
public static void main(String[] a) {
String elements[] = { "A", "B", "C", "D", "E" };
Set set = new HashSet(Arrays.asList(elements));
elements = new String[] { "A", "B", "C" };
Set set2 = new HashSet(Arrays.asList(elements));
System.out.println(set.containsAll(set2));
}
}
运行结果如下:
【set】
