import java.util.*;
import java.lang.*;

class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(allInstanceOf(String.class, "aaa", "bbb"));
        System.out.println(allInstanceOf(String.class, "aaa", 123));
	}
    
    public static boolean allInstanceOf(Class<?> cls, Object... objs) {
        for (Object o : objs) {
            if (!cls.isInstance(o)) {
                return false;
            }
        }
        return true;
    }
}