Looking into File.pathSeparator I've found out that currently we initialize them as
public static final String separator = "" + separatorChar; Which after compilation turns into NEW java/lang/StringBuilder DUP INVOKESPECIAL java/lang/StringBuilder.<init> ()V LDC "" INVOKEVIRTUAL java/lang/StringBuilder.append (Ljava/lang/String;)Ljava/lang/StringBuilder; GETSTATIC java/io/File.pathSeparatorChar : C INVOKEVIRTUAL java/lang/StringBuilder.append (C)Ljava/lang/StringBuilder; INVOKEVIRTUAL java/lang/StringBuilder.toString ()Ljava/lang/String; PUTSTATIC java/io/File.pathSeparator : Ljava/lang/String; This can be simplified to public static final String separator = String.valueOf(separatorChar); Which is in turn complied into more compact GETSTATIC java/io/File.pathSeparatorChar : C INVOKESTATIC java/lang/String.valueOf (C)Ljava/lang/String; PUTSTATIC java/io/File.pathSeparator : Ljava/lang/String; The changed code is likely to slightly improve start-up time as it allocates less and does no bound checks. ------------- Commit messages: - 8276926: Use String.valueOf() when initializing File.separator and File.pathSeparator Changes: https://git.openjdk.java.net/jdk/pull/6326/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6326&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8276926 Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod Patch: https://git.openjdk.java.net/jdk/pull/6326.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/6326/head:pull/6326 PR: https://git.openjdk.java.net/jdk/pull/6326
