如何在java中替换空值空字符串? [英] How to replace from null value empty string in java?
问题描述
我从DB获取 null
值,但我需要显示空字符串 。
I'm getting the null
values from DB, but I need to display the empty string ""
instead.
例如,我必须附加四个值才能显示在Excel工作表的单个单元格中,如下所示:
For example, I have to append four values to display in the single cell of a Excel sheet like below:
sheet.addCell(new Label(4, currentRow, a.getPar()+" "+a.getO()+" "+a.getPar()));
如何在Java中实现预期的结果(替换)? / p>
How to achieve the expected result (the replacement) in Java?
推荐答案
如果我理解正确,你可以使用三元opperator:
If I understand correctly, you can use the ternary opperator:
System.out.println("My string is: " + ((string == null) ? "" : string));
如果你不熟悉它,它会显示Is string null?如果是,那么'return'en empty string,否则'return'string。我说'return'因为你可以考虑((string == null)?:string)
作为一个返回 String的函数
。
In case you are not familiar with it, it reads "Is string null? If it is, then 'return' en empty string, else 'return' string". I say 'return' because you can consider ((string == null) ? "" : string)
as a function that returns a String
.
当然,您可以将空字符串替换为任何其他字符串
。
You can replace the empty string with any other String
of course.
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