Java显示系统中所有可用的字符集

import java.nio.charset.Charset;import java.util.Iterator;import java.util.Set;import java.util.SortedMap;public class test {    public static void supportedEncoding() {        SortedMap charsets = Charset.availableCharsets();        Set names = charsets.keySet();        Iterator it = names.iterator();        while(it.hasNext()){            String name = (String) it.next();            Charset charset = (Charset) charsets.get(name);            System.out.println(charset);            Set aliases = charset.aliases();            Iterator i = aliases.iterator();            while(i.hasNext()){                System.out.println("     " + i.next());            }        }    }    public static void main(String[] args){        supportedEncoding();    }}