Why do you need parentheses in catch blocks in Java?

In Java, if we have to execute a statement after if, or if we don't have to execute a statement for parentheses We can write:

if(condition)
  executeSingleStatement();

or

for(init;condition;incr)
  executeSingleStatement();

But in the case of catch blocks, why can't we omit parentheses? Why is this impossible?

catch(Exception e)
   e.printStackTrace();

Because in most cases, we have only one statement in the catch block, which is e.printstacktrace()

Solution

This is not a possible or impossible problem This is just a language (grammar) design decision

The Java language parser has several implementations You can modify the parser source in less than a day and allow catch statements without parentheses

http://www.google.com/search?q=java +parser

Also note the Java language grammar