Udf to count the number of occurances

Hello All
I am trying to write an UDF which can count the number of occurances of charecter ' in a string and fives the result as number of occurances - 3 . For example if the char ' is present 20 times in a string , I want the result to be 17.
Could you help me in creating this UDF please, I am a beginner to Java.
Thank you

Hi Sreeni ,
I tried you code , but it has some compilation errors ,
The cod ei used is
//write your code here
int count = 0;
String str;
for(int i=0; i=input.strlength();i++)
if (input = '\'')
count = count + 1;
count = count - 3;
str = integer.toString(count);
return str;
Just as you suggested ,
for it I got these errors
incompatible types
found : int required: boolean
for(int i=0; i=input.str.length();i++)
cannot resolve symbol
symbol : variable str
location: class java.lang.String
for(int i=0; i=input.str.length();i++)
incompatible types
found : java.lang.String
required: boolean if (input = '\'')
cannot resolve symbol
symbol : variable integer
location: class com.sap.xi.tf._MMPOFileToPayload_
str = integer.toString(count);
cheers

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