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======================抛异常
throw
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例子
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=========声明异常throws
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例子:
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=============try{}catch(异常类名 变量名){}
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例子
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===============finally代码块
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例子
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==============异常的注意事项
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案例1:
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案例2:
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案例3:
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========finally 有return
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========子父类异常
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*********************======自定义异常
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