NumberFormatException是什么东西啊？

[asiaec]

帮我猜一下是什么问题吧！


java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:394)
at java.lang.Integer.parseInt(Integer.java:476)
at com.jetech.rpms.system.util.RightUtil.getUnit(RightUtil.java:169)
at com.jetech.rpms.system.util.RightUtil.searchRight(RightUtil.java:94)
at com.jetech.rpms.system.util.RightUtil.initRightInfo(RightUtil.java:46
)

[asiaec]

request.setAttribute("pagectl",pageCtl);
request.setAttribute("personlist",col);
return mapping.findForward("success");

[comnetorgcn]

方法Integer.parseInt(String a)，当a为空或者不含有数字时可能会报这样的错

[xgchar]

Thrown to indicate that the application has attempted to convert a string to one of the numeric types, but that the string does not have the appropriate format.


NumberFormatException
public NumberFormatException()



Constructs a NumberFormatException with no detail message.

NumberFormatException
public NumberFormatException(String s)

Constructs a NumberFormatException with the specified detail message.

Parameters:
s - the detail message.

[tangqiuzheng]

我请问龙津啤酒,能不能告诉我怎么阅读那些异常信息:(即怎么根据那些异常代号查找原因呀?)

[hanty]

先判断是否为空，再格式数字类型

[skysaint]

用try和catch捕获，再处理异常