The second line of the error message says you are trying to add a JLabel to what the third error line is reporting as a List of JButton objects.
错误消息的第二行表明，您尝试将一个JLabel添加到第三个错误行报告的JButton对象的List。
Given that, you're left with the third principle of error handling: error handling is informative.
下面是错误处理的第三个原则：错误处理要有告知性。
The third production of program lets the parser go past an error, search for a semicolon, and continue afterwards (normally an error would be fatal to the parser).
program的第三个输出让这个分析程序可以获得错误，从中搜索分号，然后继续执行（通常错误对于解析器来说都是非常严重的）。
If the document_root doesn't have any child nodes, for example, config_node will be set to undef, and the third line of the example will raise an error.
例如，如果document_root没有任何子节点，则将config_node设置成undef，并且该示例的第三行将产生一个错误。
The third tests the 406 error condition. Below is the test case for atom.
第三种方法是测试406错误情况。
Clearly, if the second and third arguments turn out to be unequal during the course of program execution, that's an error.
显然，如果在执行程序期间第二个和第三个参数不相等，就是出现错误了。
Now, let's add a second test to assert valid subject data and a third test to see whether the expected error message is encountered when we specify an incorrect TAG length.
现在，再添加两个测试，一个测试检查有效的主题数据，另一个测试检查在指定不正确的 TAG 长度时是否显示期望的错误消息。
Many are still haunted by a disastrous error made at an Opec meeting in Jakarta in 1999, when the cartel — which produces more than a third of the world's oil — opted to raise its production levels.
想起1999年在OPEC组织的雅加达会议上出现过的致命错误，许多国家依然心有余悸。当时在会上，作为负担世界三分之一石油供应的卡特尔宣布，要提高该国的石油出产量。
In this case, the error shows that the second and third letters of "math" are transposed.
在本例中，错误消息显示math的第二和第三个字母颠倒了。
This shows that the error occurred on the third time through the "for" loop (I equals 2) when "value" equaled "div".
此信息显示了在第三次执行“for ”循环时(i等于2)发生了错误，此时“value ”等于“div ”。
"There are two ways to write error-free programs; only the third works." -alan J. perlis.
如果有两种方式可以编写出没有错误的程序，那么只有第三种方式是有效的。
The regularity of error and practical instructions are summarized for using infrared range-measurement system instead of the third of fourth grade levelling on Yunnan Plateau.
由此总结出在云南高原地区进行红外仪三角高程代替三、四水准，所产生误差的规律性，并制定一套较实用的操作规程。
Now, the studio is blaming the error in this particular poster on the third-party vendor whomade it.
现在，电影工作室将指责推到了设计海报的第三方发行商头上。
The third type of programming error, logic errors, can be the most difficult to discover.
还有一种编程错误是逻辑错误，这种错误是最难发现的。
Pathologists using 3-d technology detected cancer with one-third the error rate compared to those using the traditional microscope.
病理学家采用立体技术检测癌症检出采用传统的显微镜三分之一的错误率。
Czech coach Karel Bruckner said "The third goal was an error and led to our collapse".
捷克教练布吕可纳说，“第三个球是一个错误，让我们一下子垮了。”
Third, the compensation data is made easily to reduce encoder error.
直接生成细分误差补偿数据。
There are two ways to write error-free programs; only the third one works. (Alan J. Perlis).
写没有错误的程序有两种方式；但第三种才有效。
"There are two ways to write error-free programs; only the third one works." (Alan J. Perlis).
只有两种方式可以写出无错程序，只有第三种能有效。
"There are two ways to write error-free programs; only the third one works." (Alan J. Perlis).
只有两种方式可以写出无错程序，只有第三种能有效。
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