Use default param to String encoding name instead of using extra overloaded method.

libraries/stdlib/src/kotlin/StringsJVM.kt

@@ -146,8 +146,7 @@ public inline fun CharSequence.toString() : String? = (this as java.lang.CharSeq
 public inline fun CharSequence.length() : Int = (this as java.lang.CharSequence).length()
 
 
-public inline fun String.toByteArray():ByteArray = (this as java.lang.String).getBytes()
-public inline fun String.toByteArray(encoding: String):ByteArray = (this as java.lang.String).getBytes(encoding)
+public inline fun String.toByteArray(encoding: String = java.nio.charset.Charset.defaultCharset()!!.name()):ByteArray = (this as java.lang.String).getBytes(encoding)
 public inline fun String.toByteArray(encoding: java.nio.charset.Charset):ByteArray =  (this as java.lang.String).getBytes(encoding)
 
 public inline fun String.toBoolean() : Boolean = java.lang.Boolean.parseBoolean(this)

libraries/stdlib/src/kotlin/io/Files.kt

@@ -114,15 +114,7 @@ public fun File.appendBytes(data: ByteArray): Unit {
  *
  * This method is not recommended on huge files.
  */
-public fun File.readText(encoding:String) : String = readBytes().toString(encoding)
-
-/**
- * Reads the entire content of the file as a String using the default platform
- * character encoding.
- *
- * This method is not recommended on huge files.
- */
-public fun File.readText() : String = readBytes().toString()
+public fun File.readText(encoding:String = java.nio.charset.Charset.defaultCharset()!!.name()) : String = readBytes().toString(encoding)
 
 /**
  * Reads the entire content of the file as a String using a character encoding.
@@ -135,13 +127,7 @@ public fun File.readText(encoding:Charset) : String = readBytes().toString(encod
  * Writes the text as the contents of the file using the a
  * character encoding.
  */
-public fun File.writeText(text: String, encoding:String): Unit { writeBytes(text.toByteArray(encoding)) }
-
-/**
- * Writes the text as the contents of the file using the default platform
- * character encoding.
- */
-public fun File.writeText(text: String): Unit { writeBytes(text.toByteArray()) }
+public fun File.writeText(text: String, encoding:String = java.nio.charset.Charset.defaultCharset()!!.name()): Unit { writeBytes(text.toByteArray(encoding)) }
 
 /**
  * Writes the text as the contents of the file using a character encoding.
@@ -158,17 +144,10 @@ public fun File.appendText(text: String, encoding: Charset): Unit {
 /**
  * Appends text to the contents of the file using a character encoding.
  */
-public fun File.appendText(text: String, encoding: String): Unit {
+public fun File.appendText(text: String, encoding: String = java.nio.charset.Charset.defaultCharset()!!.name()): Unit {
     appendBytes(text.toByteArray(encoding))
 }
 
-/**
- * Appends text to the contents of the file using default platform character encoding.
- */
-public fun File.appendText(text: String): Unit {
-    appendBytes(text.toByteArray())
-}
-
 /**
  * Copies this file to the given output file, returning the number of bytes copied
  */

libraries/stdlib/src/kotlin/io/JIO.kt

@@ -319,14 +319,7 @@ public fun Reader.copyTo(out: Writer, bufferSize: Int = defaultBufferSize): Long
  *
  * This method is not recommended on huge files.
  */
-public fun URL.readText(encoding: String): String = readBytes().toString(encoding)
-
-/**
- * Reads the entire content of the URL as a String with default character set name
- *
- * This method is not recommended on huge files.
- */
-public fun URL.readText(): String = readBytes().toString()
+public fun URL.readText(encoding: String = java.nio.charset.Charset.defaultCharset()!!.name()): String = readBytes().toString(encoding)
 
 /**
  * Reads the entire content of the URL as a String with the specified character encoding.