在E-R图中,一对一关系使用1:1表示;一对多关系使用1:n表示;多对多关系使用()表示
A. (1:1)
B. (m:n)
C. (1:n)
D. (n:n)
class Count {public int count;public Count(int c) {count = c;}public Count(){count = 1;}}public class Test {public static void increment(Count c, int times) {c.count++;times++;}public static void main
A. myCount.count=4 times=0
B. myCount.count=4 times=1
C. myCount.count=3 times=1
D. myCount.count=3 times=0
MySQL默认的用户为()
A. sa
B. admin
C. root
D. boot
为了能在任何目录中使用编译器和解释器,应在系统中设置哪个环境变量()
A. java_home
B. path
C. classpath
D. javac