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单选题
Given the following expression about TextField which use a proportional pitch font. TextField t = new TextField（"they are good"，40）； Which statement is true？（）
A
The displayed string can use multiple fonts.
B
The maximum number of characters in a line will be 40.
C
The displayed width is exactly 40 characters.
D
The user can edit the characters.
参考答案
参考解析
解析：
对于TextField的该种形式的构造函数来说，前一个参数是文本域中初始的字符串的显示值，而后一个是推荐的显示宽度，以列数表示，在构造文本域的时候会将这个大小设置为最佳大小，如果容器的限制使得文本域不能显示这么多也没有办法，一般来说是比这个大小大的，而且即使宽度很小，你也可以在文本域的一行中输入很长的字符串，只有你不使用回车，在超过显示宽度后文本域会自动出现水平滚动条（没有被设置为关闭，缺省是不关闭的），而文本域的缺省编辑方式是可编辑的，一个文本域只能使用一种字体，这个字体可以在运行的过程中动态的改变，但是文本域中的所有字符串都将使用这个字体显示。
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