d********o
发帖数: 1738 | 1 下面这段代码的结果为什么不是
See no evil.
而是
See no evil.
Speak no evil.
Hear no evil.
public class Advice {
public final static int LITTLE_ADVICE = 0;
public final static int MORE_ADVICE = 1;
public final static int LOTS_OF_ADVICE = 2;
public static void main(String[] args) {
dispenseAdvice(LOTS_OF_ADVICE);
}
public static void dispenseAdvice(int howMuchAdvice) {
switch(howMuchAdvice) { // (1)
case 2:
System.ou |
g*****g
发帖数: 34805 | 2 If you don't break in each case, it will follow through.
【在 d********o 的大作中提到】
: 下面这段代码的结果为什么不是
: See no evil.
: 而是
: See no evil.
: Speak no evil.
: Hear no evil.
: public class Advice {
: public final static int LITTLE_ADVICE = 0;
: public final static int MORE_ADVICE = 1;
: public final static int LOTS_OF_ADVICE = 2;
|
a**e
发帖数: 5794 | 3 在这方面C#和Perl设计得更合理。
【在 g*****g 的大作中提到】
: If you don't break in each case, it will follow through.
|
d********o
发帖数: 1738 | 4 有点不明白，LOTS_OF_ADVICE的值自始至终是2, 为什么语句（3）和语句（4）也执行
了。什么是fallow through？follow through 是不是将所有的Case语句执行一遍！
case 1: System.out.println("Speak no evil.");也执行了， 难道说LOTS_OF_ADVICE
变量值会自动递减！
【在 g*****g 的大作中提到】
: If you don't break in each case, it will follow through.
|
w*****g
发帖数: 1415 | 5 他发现第一个Match之后，以后就不再比较，直接执行了，除非碰到Break; |
g*****g
发帖数: 34805 | 6 If you ever learn assembly, you'll understand why this is natural.
"case blahblah" is a just a label. You can have as many labels as
you like but the flow won't change until you do jump ("break").
C used this design and C++, Java followed.
ADVICE
【在 d********o 的大作中提到】
: 有点不明白，LOTS_OF_ADVICE的值自始至终是2, 为什么语句（3）和语句（4）也执行
: 了。什么是fallow through？follow through 是不是将所有的Case语句执行一遍！
: case 1: System.out.println("Speak no evil.");也执行了， 难道说LOTS_OF_ADVICE
: 变量值会自动递减！
|
d********o
发帖数: 1738 | 7 Thank you so much!
【在 w*****g 的大作中提到】
: 他发现第一个Match之后，以后就不再比较，直接执行了，除非碰到Break;
|
d********o
发帖数: 1738 | 8 终于明白了，谢谢！
我以前用foxpro, 一看到switch,就想到do case语句，形成偷懒的习惯了！
【在 g*****g 的大作中提到】
: If you ever learn assembly, you'll understand why this is natural.
: "case blahblah" is a just a label. You can have as many labels as
: you like but the flow won't change until you do jump ("break").
: C used this design and C++, Java followed.
:
: ADVICE
|
l*******G
发帖数: 1191 | 9 matlab does not need breaks, yet many need, so it is language-dependent, you should be very
carefull |
