Type Coercion"
From Documentation
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| (char)0 | | (char)0 | ||
| 0 | | 0 | ||
| − | | obj | + | | "" (obj) |
|- | |- | ||
| null | | null | ||
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<references/> | <references/> | ||
</blockquote> | </blockquote> | ||
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| + | * The handling of an empty string and null is the same | ||
=Version History= | =Version History= | ||
Revision as of 02:41, 8 December 2010
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) | obj |
| String (empty) | false | (char)0 | 0 | "" (obj) |
| null | false | (char)0 | 0 | "" |
| Other | ERROR | ERROR | ERROR | obj.toString() |
- The handling of an empty string and null is the same
Version History
| Version | Date | Content |
|---|---|---|