libs/src/java_nio/Charsets/CharTest

Charset x-ISO-2022-CN-CNS and x-ISO-2022-CN-GB
contais Charset US-ASCII returns true for both.

One can encode the Characters in US-ASCII range but while decoding the
same exception is being thrown.
Using the Tiger Build-29 on Solaris-9

Please find the code mentioned below.

Code:-
import java.io.*;
import java.nio.*;
import java.nio.charset.*;
import java.util.*;


public class CharTest1 {
     
         String str1 = "\u0000\u0001\u0002\u0003\u0004\u0005\u0006\u0007\u0008\u0009";
         String str2 = "\u0020\u0021\u0024\u0025\u0026\u0027\u0028\u0029";
         String str3 = "\u004A\u004B\u004C\u004D\u004E\u004F\u002B\u002C\u002D\u002E\u002F\u001A\u001B\u001C\u001D\u001E\u001F";
         String str = str1 + str2 + str3 ;
         
     public void checkEncoding(String encoding) {
         try {
              CharBuffer chbuff = CharBuffer.wrap(str);
              Charset cset1 = Charset.forName(encoding);
              System.out.println("Can encode :"+encoding+" "+cset1.canEncode());
              ByteBuffer bb = cset1.newEncoder().encode(chbuff);
              chbuff.position(0);
              CharBuffer chbuff1 = cset1.newDecoder().decode(bb);
              System.out.println("They are equal for: "+encoding+": "+chbuff1.equals(chbuff));
         } catch(Exception e) {
              e.printStackTrace();
         }
     
     }
     
     public void checkContains(String encod1, String encod2) {
            Charset cset1 = Charset.forName(encod1);
            Charset cset2 = Charset.forName(encod2);
            System.out.println(encod1+" contains "+encod2+" "+cset1.contains(cset2));
     
     }
            
     
   
     public static void main(String args[]) {
          CharTest1 ref = new CharTest1();
          ref.checkContains("x-ISO-2022-CN-CNS", "US-ASCII");
          ref.checkContains("x-ISO-2022-CN-GB", "US-ASCII");
          ref.checkEncoding("x-ISO-2022-CN-CNS");
          ref.checkEncoding("x-ISO-2022-CN-GB");
                 
     }

}



/*
x-ISO-2022-CN-CNS contains US-ASCII true
x-ISO-2022-CN-GB contains US-ASCII true
Can encode :x-ISO-2022-CN-CNS true
java.nio.charset.MalformedInputException: Input length = 2
        at java.nio.charset.CoderResult.throwException(CoderResult.java:260)
        at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:763)
        at CharTest1.checkEncoding(CharTest1.java:22)
        at CharTest1.main(CharTest1.java:43)
Can encode :x-ISO-2022-CN-GB true
java.nio.charset.MalformedInputException: Input length = 2
        at java.nio.charset.CoderResult.throwException(CoderResult.java:260)
        at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:763)
        at CharTest1.checkEncoding(CharTest1.java:22)
        at CharTest1.main(CharTest1.java:44)
*/