converting a string to an expression

[kusuma chalasani]

hii..
i want to convert a string into an expression.for example,
if "j=1" is a string then i want to change it into an expression j=1 and i want to use that in running my program in java..
please give me the solution for this..
thank u..

[r035198x]

hii..
i want to convert a string into an expression.for example,
if "j=1" is a string then i want to change it into an expression j=1 and i want to use that in running my program in java..
please give me the solution for this..
thank u..

I doubt if this is what you really want to do. Revise your design. Tell us what you want your program to achieve and there should be a better way of acieving your required functionality.

[kusuma chalasani]

i want my applet to change dynamically according to the change in variable.
in my program, i want to retrieve a string ( "redfail=true") from the database and i want that redfail=true which should act as a boolean in the run method and according to this redfail value, some changes wil occur in the applet.

[r035198x]

i want my applet to change dynamically according to the change in variable.
in my program, i want to retrieve a string ( "redfail=true") from the database and i want that redfail=true which should act as a boolean in the run method and according to this redfail value, some changes wil occur in the applet.

That's better.

Now you just get the value from the db into a boolean variable and compare with

 if(value) { 
//make changes
}
else {
//make different changes
}
 

Now are you having a problem with any of this?

[kusuma chalasani]

That's better.

Now you just get the value from the db into a boolean variable and compare with

 if(value) { 
//make changes
}
else {
//make different changes
}
 

Now are you having a problem with any of this?

I didnt get what the value mean???

In my program i'm retrieving a string as "redfail=true" from db. and i'm going to use the value of the boolean variable 'redfail'.
ie
boolean redfail=false;

.
.
String s="redfail=true"; // s is retrieving from database
.
.
if(redfail==true) //how can i change the value of redfail as true according to the
// result from the database?
{
.
.
}
i think my doubt is clear now..
Thank u..

[r035198x]

 String s="redfail=true"; 
String[] strings = s.split("="); //string[0] is redfail and strings[1] is true or false
boolean value = strings[1].equalsIgnoreCase("true") ? true:false;
if(value) {
 
///
}
else {
//
}
 

[kusuma chalasani]

thank u very much..

[r035198x]

thank u very much..

I take it you managed to get it work properly?

[kusuma chalasani]

Thank u..
i have one doubt..
cant we change the string " redfail=true" to a
statement like redfail=true; ?

 boolean redfail=false;
.
.
String s="redfail=true"; // s is retrieving from database
.
.
 
redfail==true ;//how can i change the value of redfail as true according to the 
                   // result from the database? 
 

[r035198x]

Thank u..
i have one doubt..
cant we change the string " redfail=true" to a
statement like redfail=true; ?

Just give it the value of the variable value from the previous code I posted

 
String s="redfail=true"; 
String[] strings = s.split("="); //string[0] is redfail and strings[1] is true or false
redfail = strings[1].equalsIgnoreCase("true") ? true:false;
 
 

In this case if the string is "redfail=true", then the variable redfail is assigned true otherwise it is assigned false.

[jipsonpj]

hai ..........
i am jipson
i have one doute in c++
can you help me

[r035198x]

hai ..........
i am jipson
i have one doute in c++
can you help me

The c++ forum is here. Post a new thread thread there for your problem. Remember to give a title that best explains your problem.

[kusuma chalasani]

Just give it the value of the variable value from the previous code I posted

 
String s="redfail=true"; 
String[] strings = s.split("="); //string[0] is redfail and strings[1] is true or false
redfail = strings[1].equalsIgnoreCase("true") ? true:false;
 
 

In this case if the string is "redfail=true", then the variable redfail is assigned true otherwise it is assigned false.

thank u..
in my program i have to retrieve so many strings at a time. i.e., there are so many variables like redfail,redsefail,greenfail,greenfail and many more...
instead of writing code for every variable, is there any other option to make strings[0] in the above code can be used directly as a variable????

[kusuma chalasani]

thank u..
in my program i have to retrieve so many strings at a time. i.e., there are so many variables like redfail,redsefail,greenfail,greenfail and many more...
instead of writing code for every variable, is there any other option to make strings[0] in the above code can be used directly as a variable????

to be clear..
as ther were so many variables in the program..
instead of writing code for every variable like

if(strings[0].equals("redfail"))
redfail = strings[1].equalsIgnoreCase("true") ? true:false;
if(strings[0].equals("redsefail"))
redsefail=strings[1].equalsIgnoreCase("true") ? true:false;
.
.
is there any other option to make strings[0] in the above code can be used directly as a variable.

[r035198x]

to be clear..
as ther were so many variables in the program..
instead of writing code for every variable like

if(strings[0].equals("redfail"))
redfail = strings[1].equalsIgnoreCase("true") ? true:false;
if(strings[0].equals("redsefail"))
redsefail=strings[1].equalsIgnoreCase("true") ? true:false;
.
.
is there any other option to make strings[0] in the above code can be used directly as a variable.

That's the way to do it. If you have too many boolean variables why not use an array?

[shivsriv]

You can convert A string into expression without using switch case or if -else .how it is click the following link

http://adf.ly/3xnnc