java_generics
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java_generics [2017/01/02 15:16] 178.237.8.52 [Unbound wildcards] |
java_generics [2017/01/02 15:17] (current) 178.237.8.52 [Upper-bound wildcards] |
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| Creates an instance of a ''List'' of **any kind**. An ''ArrayList'' of ''String>'' will be ok, for instance. | Creates an instance of a ''List'' of **any kind**. An ''ArrayList'' of ''String>'' will be ok, for instance. | ||
| ==== Upper-bound wildcards ==== | ==== Upper-bound wildcards ==== | ||
| + | |||
| + | Upper bound wildcards are used when you want to accept an **instance of a class or any of its derivatives** | ||
| + | |||
| + | <code java> | ||
| + | List<? extends Exception> list = new ArrayList<IOException>(); | ||
| + | </code> | ||
| ==== Lower-bound wildcards ==== | ==== Lower-bound wildcards ==== | ||
java_generics.txt ยท Last modified: 2017/01/02 15:17 by 178.237.8.52
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