[Java] Switch on Strings in Java ^_^

[evill33t]

Since you cant switch strings in java..someone made a funny bypass
(found it on worsethanfailure )

int helpArg = getHashValue("help");

int singleArg  = getHashValue("single");

int mutiArg = getHashValue("multi");



public static void  main (String args[])

{

    // Get a hash value for the first argument

    int hash = getHashValue(args[0].toCharArray());



    switch(hash)

    {

        case helpArg: 

            ...

            break;

        case singleArg: 

            ...

            break;

        case mutiArg: 

            ...

            break;

        // etc

    }

}

the orginal version

public static void  main (String args[])
{
    // Get a hash value for the first argument
    int hash = getHashValue(args[0].toCharArray());

    switch(hash)
    {
        case 972346: // The first argument was "help"
            ...
            break;
        case -91058: // The first argument was "single"
            ...
            break;
        case -4830672: // The first argument was "multi"
            ...
            break;
        // etc
    }
}

Attention: Some Strings can have the same hashcode but overall it should be secure to use this :)

[MentaL]

[username1]

A series of else if would work just as well, with no chance of collision.

[evill33t]

sure it would work but its just an example how to use switch on strings :P
imagine 100 else conditions then this switch would look nicer :)
and it would work faster (the hash function takes up the speed you gain tough)

edit:
i wouldnt use it in a real project
its just a funny code snippet

[username1]

If all your strings are 4 or less characters in length, this is one way to switch (32-bit machine):

char strarray[4];
unsigned int *dordmaker = &strarray;
switch(*dordmaker) {
 case 542393671:
  ...
 case 1414745936:
  ...
 case 1145128264:
  ...
}

This gets even better on a 64-bit machine. 8 or less characters in length. Or you could use long ints on a 32-bit machine.