下列程序片段中,能通过编译的是()
A.public abstract class Animal{ public void speak()} B.public abstract class Animal{ public vold speak(){}} C.public class Animal{ pubilc abstract void speak()} D.public abstract class Animal{ pubilc abstract void speak(){}}
单项选择题下列可以获得构件前景色的方法是()
A.getSize() B.getForeground() C.getBackground() D.paint()
单项选择题若定义int a=2,b=2,下列表达式中值不为4的是()
A.a*(++b) B.a*(b++) C.a+b D.a*b