Downcasting vs Upcasting in Java

CharSequence l_sq0 = new String( "HelloWorld 0" );
System.out.println( "CharSequence: " + l_sq0.toString() );
// Downcasting CharSequence to String

String l_tstr2 = (String)l_sq0;
byte[] l_bytes = l_tstr2.getBytes();
System.out.println( "String: " + l_tstr2.toString() +
                " Length: " + l_bytes.length );
        
String l_tstr = new String( "Hello World 1" );

// Upcasting String to CharSequence
CharSequence l_sq = (CharSequence)l_tstr;

System.out.println( "String: " + l_tstr.toString() );
System.out.println( "CharSequence: " + l_sq.toString() );

 

In the above example, String which implemented CharSquence in java.lang has been upcasted and downcasted at two different places. So, that is allowed.

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