question: private static boolean contentsEquals ( InputStream in1 , InputStream in2 ) throws IOException { if ( ! ( in1 instanceof BufferedInputStream ) ) { in1 = new BufferedInputStream ( in1 ) ; } if ( ! ( in2 instanceof BufferedInputStream ) ) { in2 = new BufferedInputStream ( in2 ) ; } int ch = in1 . read ( ) ; while ( ch != - 1 ) { int ch2 = in2 . read ( ) ; if ( ch != ch2 ) { return false ; } ch = in1 . read ( ) ; } int ch2 = in2 . read ( ) ; return ch2 == - 1 ; }
target:  Checks whether in1 and in2 is equal.