检查int溢出的结果

public class Main {


    public static void main(String[] args) {
    /*
    时   代    Java - nowjava.com
    */

        int n = 2147483647; //2^31-1;

        int nval = n + 1;

        System.out.println("If n=" + n + " then n+1=" + nval);


        long m = 9223372036854775807L;

        long mval = m + 1;

        System.out.println("If m=" + m + " then m+1=" + mval);

    }

}