如何将/转换/转换为String? [英] How to convert / cast long to String?
问题描述
我刚刚创建了示例BB应用程序,可以选择日期。
I just created sample BB app, which can allow to choose the date.
DateField curDateFld = new DateField("Choose Date: ",
System.currentTimeMillis(), DateField.DATE | DateField.FIELD_LEFT);
选择日期后,我需要将该长值转换为String,以便我可以轻松存储数据库中某处的日期值。
我是Java和Blackberry开发的新手。
After choosing the date, I need to convert that long value to String, so that I can easily store the date value somewhere in database. I am new to Java and Blackberry development.
long date = curDateFld.getDate();
我应该如何将这个长值转换为String?另外我想从String转换回long。我想我可以使用 long l = Long.parseLong(myStr);
?
How should I convert this long value to String? Also I want to convert back to long from String. I think for that I can use long l = Long.parseLong("myStr");
?
推荐答案
请参阅参考String类的文档: String s = String.valueOf(date);
如果你的Long可能为null,你不想得到一个4个字母的null
字符串,你可以使用 Objects.toString
,例如: String s = Objects.toString(date,null);
If your Long might be null and you don't want to get a 4-letter "null"
string, you might use Objects.toString
, like: String s = Objects.toString(date, null);
编辑:
你使用反转它l长l = Long.valueOf(s );
但是在这个方向你需要捕获 NumberFormatException
You reverse it using Long l = Long.valueOf(s);
but in this direction you need to catch NumberFormatException
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