deamo

public class deamo2 {
    public static void main(String[] args) {
        int i =128;
        byte b =(byte)i;
        System.out.println(i);
        System.out.println(b);
        //强制转换（变量名称)
        System.out.println("-------------------------------------------------");
        byte b1 =1;
        int  i1 =b1;
        System.out.println(b1);
        System.out.println(i1);
        //非强制转换不需要（）
        System.out.println("-------------------------------------------------");
        System.out.println((int)27.89);     //27
        System.out.println((int)-45.999);   //-45
        //转换时的精度会变
        System.out.println("-------------------------------------------------");
        char c1 ='a';
        int  i2 =c1+1;
        System.out.println(i2);
        System.out.println((char) i2);
        //变换字母
        System.out.println("-------------------------------------------------");
        int money =10_0000_0000;
        System.out.println(money);//输出的为1000000000
        int money1 =10-0000-0000;
        System.out.println(money1);//输出的为10
        //在处理较大的数据时可以用下划线_来进行分割
        System.out.println("-------------------------------------------------");
        int money2 =10_0000_0000;
        int year   =20;

        int total =money2*year;
        System.out.println(total);//输出为-1474836480（错误）

        long total1 =money2*(long)(year);
        System.out.println(total1);//输出为20000000000(正确)

        long total2 =(long)(money2)*year;
        System.out.println(total2);//输出为20000000000(正确)

        //如果在输出较大的乘法时，要先进行转换(转换其中一个即可)
        System.out.println("-------------------------------------------------");



    }
}