import java.nio.charset.Charset;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.SortedMap;
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import java.util.Set;
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public class Main {
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static public void main(String[] args) throws Exception {
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// These charsets must be provided; anything else is optional.
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List<String> standardCharsets = Arrays.asList("US-ASCII", "ISO-8859-1",
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"UTF-8", "UTF-16BE", "UTF-16LE", "UTF-16");
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SortedMap<String, Charset> all = Charset.availableCharsets();
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Set<String> needed = new HashSet<String>(standardCharsets);
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for (Map.Entry<String, Charset> e : all.entrySet()) {
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String canonicalName = e.getKey();
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needed.remove(canonicalName);
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}
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System.out.println("Missing: " + needed);
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}
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}
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