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cs257e17:proj2 [2017/03/03 17:39]
scarl
cs257e17:proj2 [2021/03/09 14:58] (current)
scarl
Line 1: Line 1:
-It appears Java 8 has tightened up rules on casting. To fix some of the problems:+It appears ​newer versions of Java tightened up rules on casting. To fix some issues I've seen:
  
-Prefer calling **superclass** methods to accessing the protected instance variables. For example: +In ''​dump''​, trying to output members of the ''​elements''​ array can cause casting errors at runtime. A simple workaround is 
-<code java> +
-   short x, y, z; +
-   x = super.top();​ +
-   ​super.pop();​ +
-   y = super.top();​ +
-   ​super.pop();​ +
-   z = (short) x + y; +
-</​code>​  +
- +
-In dump, trying to output members of the ''​elements''​ array can cause casting errors at runtime. A simple workaround is +
  
 <code java> <code java>
Line 19: Line 9:
 } }
 </​code>​ </​code>​
 +
 +When using inheritance,​ prefer calling **superclass** methods to accessing protected instance variables. For example:
 +<code java>
 +   short x, y, z;
 +   x = super.top();​
 +   ​super.pop();​
 +   y = super.top();​
 +   ​super.pop();​
 +   z = (short) (x + y); // cast because type of the result is int
 +</​code> ​
cs257e17/proj2.1488584359.txt.gz · Last modified: 2017/03/03 17:39 by scarl