Demo05

public class Demo05 {
    public static void main(String[] args) {
        int money = 10_0000_0000;
        System.out.println(money);
        int years = 20;
        int total = money*years;
        System.out.println(total);//-1474836480,  计算的时候溢出了
        long total2 = money*years;//默认是int,Z转换之前已经出现问题
        long total3 = money*((long)years);//先把一个数转换long再进行
        System.out.println(total3);



    }
}