Type Coercion
From Documentation
EL expressions will coerce the type automatically. Here is the summary of the coercion rules.
| Boolean | Character | Number | String | |
|---|---|---|---|---|
| Boolean | obj[1] | ERROR | ERROR | obj.toString() |
| Character | ERROR | obj | (short)obj | obj.toString() |
| Number | obj | ERROR | (char)obj | obj.toString() |
| String (not empty) | Boolean.valueOf(obj) | obj.charAt(0) | Number[2].valueOf(x) | -- |
| String (empty) | false | (char)0 | 0 | obj |
| null | false | (char)0 | 0 | "" |
| Other | ERROR | ERROR | ERROR | obj.toString() |
Version History
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