Thread: replacing few keywords with corresponding operators

Suppose i have a string as fallows
if(a greater than b)
and i want to replace "greater than" with ">",how should i replace?
i want to replace the following keywords with corresponding operators if it appears in if statement.
keyword operator
greater than >
lesser than <
greater than or equals to >=
lesser than or equals to <=
not equals to !=
equals to ==

Have a look at String.replace().

Ya i tried.I just want to know what concept i should use for the problem i stated.

its about replacing only.but am not understanding how to do it.

I know how to use replace() method.my problem is when i read a string,how should i check if it contains the keywords i mentioned in post#1,and then replace with its corresponding operator.

am trying to read a string and check if it contains the keywords am looking for.If it contains those keywords,i should replace it with operator.
now to check if a string contains the keyword if need,i can't use .contains() method.so what should i do?

class keys{
public static void main(String[] args)
{
String str="if(a greater than b)";
if(str.contains("greater than"))
str=str.replace("greater than",">");
if(str.contains("lesser than"))
str=str.replace("lesser than", "<");
.
.
.
.
}
}

i should use so many if blocks if the string contains more than one keywords and even if keywords are more.how can i reduce it?

ok i will try.but i don't know to use map,if u could post some links to learn about it,it would be helpful.