PB.DCP

Do not confuse the "+" operator for String concatenation

Description

This rule flags code where you might be confusing the "+" operator for `String' concatenation.

Example

The code below shows the trap you might fall into when using "+" the wrong way. The output of the following example is "2+9 = 29" not "2+9 = 11" as you might have expected.

 package PB;
 
 public class DCP {
     public static void main (String args []) {
         System.err.println ("2 + 9 = " + 2 + 9);
     }
 }

Repair

Calculate the result outside the System.out.println statement and print it, or enclose "2+9" in parentheses, i.e: "2+9 = " +(2+9)