Java 如何将长转换/转换为字符串？
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How to convert / cast long to String?
提问by user225714
I just created sample BB app, which can allow to choose the date.
我刚刚创建了示例 BB 应用程序，它可以允许选择日期。
DateField curDateFld = new DateField("Choose Date: ",
System.currentTimeMillis(), DateField.DATE | DateField.FIELD_LEFT);
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.
选择日期后，我需要将该长值转换为字符串，以便我可以轻松地将日期值存储在数据库中的某处。我是 Java 和 Blackberry 开发的新手。
long date = curDateFld.getDate();
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");?
我应该如何将这个长值转换为字符串？另外我想从String转换回long。我认为我可以使用long l = Long.parseLong("myStr");？
回答by Gregory Pakosz
See the reference documentation for the String class: String s = String.valueOf(date);
请参阅String 类的参考文档：String s = String.valueOf(date);
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);
如果您的 Long 可能为 null 并且您不想获得 4 个字母的"null"字符串，则可以使用Objects.toString，例如：String s = Objects.toString(date, null);
EDIT:
编辑：
You reverse it using Long l = Long.valueOf(s);but in this direction you need to catch NumberFormatException
您使用反转它Long l = Long.valueOf(s);但在这个方向上您需要抓住NumberFormatException
回答by MR.M
very simple, just concatenate the long to a string.
非常简单，只需将 long 连接到一个字符串。
long date = curDateFld.getDate();
String str = ""+date;
回答by Fisu
String strLong = Long.toString(longNumber);
Simple and works fine :-)
简单且工作正常:-)
回答by iKushal
1.
1.
long date = curDateFld.getDate();
//convert long to string
String str = String.valueOf(date);
//convert string to long
date = Long.valueOf(str);
2.
2.
//convert long to string just concat long with empty string
String str = ""+date;
//convert string to long
date = Long.valueOf(str);
回答by MBR
String logStringVal= date+"";
Can convert the long into string object, cool shortcut for converting into string...but use of String.valueOf(date);is advisable
可以将 long 转换为字符串对象，很酷的转换为字符串的快捷方式...但String.valueOf(date);建议使用
回答by CONvid19
Long.toString()
Long.toString()
The following should work:
以下应该工作：
long myLong = 1234567890123L;
String myString = Long.toString(myLong);
回答by Nathan Meyer
String longString = new String(""+long);
or
或者
String longString = new Long(datelong).toString();
