Use
"" instead of new String() to create empty strings JAVA-P0063
Performance
Major
a month ago
—
2 years old
Empty
String constructor is inefficient, use "" instead35 public static void main(String[] args) throws IOException {
36 File configLocation = new File(args[1]); // JAVA-E0406
37 BufferedReader configReader = null;
38 CharBuffer configBuf = CharBuffer.wrap(new String());39
40 HashMap<String, BigDecimal> hm = new HashMap<>();
41
Description
Creating a new java.lang.String object using the default constructor wastes memory because the object so created will be functionally indistinguishable from the empty string constant "".
Java guarantees that identical string constants will be represented by the same String object. Therefore, you should just use the empty string constant directly.
Bad Practice
String a = new String("");
Recommended
String a = "";
References
- Spotbugs - DM_STRING_VOID_CTOR