Get empty string when null
If alternative way, Guava provides Strings.nullToEmpty(String)
.
Source code
String str = null;
str = Strings.nullToEmpty(str);
System.out.println("String length : " + str.length());
Result
0
For java 8 you can use Optional approach:
Optional.ofNullable(gearBox).orElse("");
Optional.ofNullable(id).orElse("");
You can use Objects.toString()
(standard in Java 7):
Objects.toString(gearBox, "")
Objects.toString(id, "")
From the linked documentation:
public static String toString(Object o, String nullDefault)
Returns the result of calling
toString
on the first argument if the first argument is not null and returns the second argument otherwise.Parameters:
o
- an objectnullDefault
- string to return if the first argument isnull
Returns:
the result of callingtoString
on the first argument if it is notnull
and the second argument otherwise.See Also:
toString(Object)
If you don't mind using Apache commons, they have a StringUtils.defaultString(String str)
that does this.
Returns either the passed in String, or if the String is null, an empty String ("").
If you also want to get rid of "null"
, you can do:
StringUtils.defaultString(str).replaceAll("^null$", "")
or to ignore case:
StringUtils.defaultString(str).replaceAll("^(?i)null$", "")