javase review day01()

inner class

BigIntergerBigInteger a = new BigInteger("11");System.out.println(a.multiply(BigInteger.valueOf(2))        .divide(BigInteger.valueOf(3)));Date now = new Date();System.out.println(now);Toolkit.getDefaultToolkit().beep();//叮的声音JOptionPane.showMessageDialog(null, "quit ?");//需要确定才会继续下面的System.exit(0);