<qiyuangong>709_To_Lower_Case_2.java
public String toLowerCase(String str) {
        char[] a = str.toCharArray();
        for (int i = 0; i < a.length; i++)
            if ('A' <= a[i] && a[i] <= 'Z')
                a[i] = (char) (a[i] - 'A' + 'a');
        return new String(a);
    }
public String var_0 ( String var_2 ) {
  char [ ] var_4 = var_2 . toCharArray ( ) ;
  for ( int var_6 = 0 ;
  var_6 < var_4 . length ;
  var_6 ++ ) if ( 'A' <= var_4 [ var_6 ] && var_4 [ var_6 ] <= 'Z' ) var_4 [ var_6 ] = ( char ) ( var_4 [ var_6 ] - 'A' + 'a' ) ;
  return new String ( var_4 ) ;
}
