CODEWITHSUNDEEP
javalong-integer
user12530264
user12530264

Reputation:

Most efficient way to convert Long to string?

If I have a Long (not the primitive) whats the best way to convert it to a string. By best, I mean fastest.

Currently, I'm doing this.

Long testLong = 123456L;
return new StringBuilder()
               .append(PREFIX)
               .append("_")
               .append(testLong)
               .toString();

is String.valueOf(testLong) or testLong.toString() better?

Upvotes: 0

Views: 657

Answers (1)

user3453226
user3453226

Reputation:

.append(testLong) calls .append(String.valueOf(testLong)).

.append(String.valueOf(testLong)) calls .append((testLong == null) ? "null" : testLong.toString())

.append(testLong.toString()) calls .append(Long.toString(testLong.value)) (where value is the boxed long), which creates a new String

.append(testLong.longValue()) does not create a new String, instead, it writes directly to the StringBuilder byte array.

Therefore the latter is the fastest, if you know that the Long will never be null:

Long testLong = 123456L;
return new StringBuilder()
               .append(PREFIX)
               .append("_")
               .append(testLong.longValue())
               .toString();

Upvotes: 1

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