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String class substring methods

public class MainClass {    public static void main( String args[] )    {       String letters = "abcdefghijklmabcdefghijklm";       // test substring methods       System.out.printf( "Substring from index 20 to end is \"%s\"\n",          letters.substring( 20 ) );       System.out.printf( "%s \"%s\"\n",           "Substring from index 3 up to, but not including 6 is",          letters.substring( 3, 6 ) );    } // end main } Substring from index 20 to end is "hijklm" Substring from index 3 up to, but not including 6 is "def"