【狂神说】Java基础05：类型转换

public class Demo05 {
    public static void main(String[] args) {
        int i = 128;
        byte b = (byte)i;   //内存溢出
        //double b = i;

        //强制转换  （类型）变量名     高——低
        //自动转换  低——高

        System.out.println(i);
        System.out.println(b);


        

        System.out.println("========================");
        System.out.println((int)23.8);
        System.out.println((int)-45.89f);

        System.out.println("========================");
        char c = 'a';
        int d = c+1;
        System.out.println(d);
        System.out.println((char)d);


        //操作较大的数时，注意溢出问题
        //数字里面可以用下划线分割
        int money = 10_0000_0000;
        int year = 20;
        int total1 = money*year;    //计算溢出
        long total2 = money*year;

        long total3 = money*((long)year);
        System.out.println(total3);
    }
}