Summary
-------

Add overloading Constructors/Methods that take a Charset object as a parameter
to APIs in java.io, java.net, java.nio and java.util. These APIs contain existing 
Constructors/Methods that take a Charset or Encoding name as a parameter.

Problem
-------

There are a variety of APIs in the java.base module that take a charset or encoding
name as a parameter and are declared to throw UnsupportedEncodingException,
 which is checked. Having to enter a literal charset or encoding name is inconvenient
and error prone, while the check Exception is unnecessary in most cases.

Solution
--------

Add overloading Constructors/Methods that take a Charset object as a parameter.

Specification
-------------

Add overloading Constructors/Methods to the following classes:

    java.io
    java/io/ByteArrayOutputStream.java
    java/io/PrintStream.java
    java/io/PrintWriter.java

    java.net
    java/net/URLDecoder.java
    java/net/URLEncoder.java

    java.nio
    java/nio/channels/Channels.java

    java.util
    java/util/Formatter.java
    java/util/Properties.java
    java/util/Scanner.java


specdiffs attached. Below is a convenient link:

http://cr.openjdk.java.net/~joehw/jdk10/8190577/specdiff/overview-summary.html