switch-statement

问题 I want to use design pattern for this switch - case code. I tried to use the command pattern, but I could not understand how(I was programming only 2 for months) I wrote this program to learn how to better program. My code: public class Server { private static final String READ_NEW_MESSAGES = "read new mes"; private static final String SEND_PRIVATE_MESSAGES = "send mes"; private static final String JOIN_CHAT = "find chat"; private static final String CREATE_CHAT = "chating"; private static

问题 I have a 8 bit byte that represents the states of 8 physical switches. I need to do something different for each permutation of switches being on and off. My first idea was to write a 256 case switch statement, but it quickly became tedious to type. Is there a better way to do this? Edit: I should have been a bit clearer on the functions. I have 8 buttons that each do one thing. I need to be able to detect if multiple switches are pressed at once so I can run both functions at the same time.

问题 I am developing an app in Phonegap.. My app is based on numerology calculation, In my app there is a portion where I need to calculate the value of letters. For example my name 'Aron' .. I need to calculate the values, I am using switch case statement for that but it is not working.. can anyone pls help me to find out the error..I am giving my code below. //curage is current age //fna is firstname var bbbb; for(var i=0; i<curage; i++) { bbbb+=lettervalue(fna.charAt(i)); } function lettervalue

问题 Currently, I am mainly using Fragments to connect to Facebook. However, for the other codes, I am using normal activites (no Fragments). My issue now is that I wish to have a button to link from my "Home Page" to the Fragment, and from the Fragment back to my "Home Page" I am unable to do so. I tried to use the same code to switch between activities for this but it does not work. Is there a way to Link Normal Activities to Fragments and Vice Versa ? Or can they only link to each other ? This

问题 What happens if the switch has more than 5000 case . What are the drawbacks and how we can replace it with something faster? Note: I am not expecting to use array to store cases as it's the same. 回答1: There's no specific reason to think you'd want anything other than a switch/case statement (and indeed I'd actively expect it to be unhelpful). The compiler should create efficient dispatching code, which might involve some combination of static [sparse] table(s) and direct indexing, binary

问题 I have a final class Ring defined as: final class Ring { public static final int OUT = 3; public static final int MID = 2; public static final int IN = 1; } I also have a public class MorrisBoard with the following code: public class MorrisBoard { public static final Ring RING = new Ring(); private boolean checkMillBy(int ring, int x, int y) { switch(ring) { case MorrisBoard.RING.OUT: //... case MorrisBoard.RING.MID: //etc. //... } return false; } MorrisBoard.RING.OUT references a variable

问题 I have multiple cases in a switch that do the same thing, like so: (this is written in Java) case 1: aMethod(); break; case 2: aMethod(); break; case 3: aMethod(); break; case 4: anotherMethod(); break; Is there any way I can combine cases 1, 2 and 3 into one case, since they all call the same method? 回答1: case 1: case 2: case 3: aMethod(); break; case 4: anotherMethod(); break; This works because when it happens to be case 1 (for instance), it falls through to case 2 (no break statement),

问题 I want to use the switch statement in some simple code i'm writing. I'm trying to compare the variable in the parenthesis with values either < 13 or >= 13 . Is this possible using Switch ? var age = prompt("Enter you age"); switch (age) { case <13: alert("You must be 13 or older to play"); break; case >=13: alert("You are old enough to play"); break; } 回答1: Directly it's not possible but indirectly you can do this Try like this switch (true) { case (age < 13): alert("You must be 13 or older

问题 How can I use switch in blade templates? When I used: @switch($login_error) @case(1) `E-mail` input is empty! @break @case(2) `Password` input is empty! @break @endswitch in result I see this text as plaintext. I prefer to use switch in few piece of code because it's more clean for me than when I using if. But if it's not possible just write it. 回答1: Updated 2019 Answer Since Laravel 5.5 the @switch is built into the Blade. Use it as shown below. @switch($login_error) @case(1) <span> `E-mail`

问题 How can I use switch in blade templates? When I used: @switch($login_error) @case(1) `E-mail` input is empty! @break @case(2) `Password` input is empty! @break @endswitch in result I see this text as plaintext. I prefer to use switch in few piece of code because it's more clean for me than when I using if. But if it's not possible just write it. 回答1: Updated 2019 Answer Since Laravel 5.5 the @switch is built into the Blade. Use it as shown below. @switch($login_error) @case(1) <span> `E-mail`