public class Test
{
public static void main(String[] args)
{
byte b=127;
byte c=126;
byte d=(byte)(b*c);
System.out.println(d); //为什么输出-126, 按我的想法上一步相乘应该会超出byte的范围,为什么没有报错呀?
}
}

大家帮我解决一下这个疑问..谢谢!

再添一个问题
which is true?
A. Any statement that may throw an Exception must be enclosed in a try block.
//Standard Exception (Runtime Exception) is not
B. Any statement that may throw an Error must be enclosed in a try block.
C. Any statement that may throw an RuntimeException must be enclosed in a try block.
D.No exception are subclass of Error.

答案写的是D...但Error类也有子类呀....如AnnotationFormatError, AssertionError, AWTError, CoderMalfunctionError, FactoryConfigurationError, FactoryConfigurationError, IOError, LinkageError, ServiceConfigurationError, ThreadDeath, TransformerFactoryConfigurationError, VirtualMachineError

应该选什么呢?


我多问个问题


public class Test
{
public static void main(String[] args)
{
int b=99999999;
int c=99999999;
int d = b*c; //b*c = 9999999900000001 这个数远远超出了int的最大值,为什么也不会报错呀?
System.out.println(d);
System.out.println(Integer.MAX_VALUE); //2147483647
}
}

[此贴子已经被作者于2007-4-30 23:46:23编辑过]

API上写public class AnnotationFormatError extends Error

按你的说法 AnnotationFormatError 不算是Error的子类,而是算Throwable的子类是吗?

谢谢~~

明白了,是我理解错了..答案D写的是没有一个exception是error的子类.. 我误以为AnnotationFormatError 是exception了..

谢谢指点!


我多问个问题
高手再指点我下..
public class Test
{
public static void main(String[] args)
{
int b=99999999;
int c=99999999;
int d = b*c; //b*c = 9999999900000001 这个数远远超出了int的最大值,为什么也不会报错呀?
System.out.println(d);
System.out.println(Integer.MAX_VALUE); //2147483647
}
}

高手再指点我下..

谢谢神vLinux飘飘x ,学习了~~~~~~~