Java: Using created string as loop parameter?

In short, the user will input a number (say 1 through 3). This will decide which range of numbers the loop should search through.

switch(input){
case 1:
    searchTerm = "i<10 && i>5";
case 2:
    searchTerm = "i>=10 && i<19";
case 3:
    searchTerm = "i>19 && i<24";
}
while(searchTerm){
    //some function
}

Is this possible? I I've not been able to find a way to use a string as search parameters.

EDIT: I don't think I did a very good job of explaining why I needed this. What is one to do if there are different numbers of parameters? For example:

case 1:
    searchTerm = "i<5"
case 2:
    searchTerm = "i>25 && i<29"
case 3:
    searchTerm = "(i<50 && i>25) && (i>55 && i<75)"
case 4:
    searchTerm = "(i<20 && i>15) && (i>300 && i<325) && (i>360 && i<380)

Then how does one do it? Multiple loops that call the same function?

via Chebli Mohamed