//整数溢出

        Integer i = Integer.MAX_VALUE;

        System.out.println(i + 1 < i); //true

        System.out.println(i + 1); //-2147483648

        System.out.println((int) (Math.pow(2, 32) - 1) == Integer.MAX_VALUE); //true

        //Double.NaN与任何数(包括自己)比较都为false，与js的NaN一样

        double a = Double.NaN;

        double b= a;

        double c = 1;

        System.out.println(a == b); //false

        System.out.println(a == Double.NaN); //false

        System.out.println(a > b ||a <= b); //false

        System.out.println(a > c ||a <= c); //false