RFR: JDK-8197594: String#repeat

[Jim Laskey]

Introduction of a new instance method String::repeat to allow an efficient and concise approach for generating repeated character sequences as strings.

Performance information in JBS.

Thank you.

Cheers,

— Jim


JBS: https://bugs.openjdk.java.net/browse/JDK-8197594 <https://bugs.openjdk.java.net/browse/JDK-8197594>
CSR: https://bugs.openjdk.java.net/browse/JDK-8198296
 <http://cr.openjdk.java.net/~jlaskey/8197594/String.html>
Webrev: http://cr.openjdk.java.net/~jlaskey/8197594/webrev-02/index.html <http://cr.openjdk.java.net/~jlaskey/8197594/webrev-02/index.html>
JavaDoc: http://cr.openjdk.java.net/~jlaskey/8197594/String.html <http://cr.openjdk.java.net/~jlaskey/8197594/String.html>