软件包 | 描述 |
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java.util |
包含集合框架、遗留的集合类、事件模型、日期和时间的设施、国际化和各种实用工具类(一个字符串标记,一个随机数发生器,和一位阵列)。
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Modifier and Type | Method and Description |
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void |
Observer.update(Observable o, Object arg)
当所观察到的对象被更改时,这种方法被调用。
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