Java日志第46天 2020.8.21

例2.1 将字符赋给整型变量

public class Demo2_1 {
    public static void main(String[] args) {
        int i, j;
        i = 'A';
        j = 'B';
        System.out.println(i+ " " + j);
    }
}

 

 

 

例2.2 字符数据与整数进行算术运算。下面程序的作用是将小写字母转换为大写字母。

public class Demo2_2 {
    public static void main(String[] args) {
        char c1, c2;
        c1 = 'a';
        c2 = 'b';

        c1 = (char) (c1-32);
        c2 = (char) (c2-32);
        System.out.println(c1 + " " + c2);
    }
}

 

 

例2.3 符号常量的使用

public class Demo2_3 {
    public static void main(String[] args) {
        final int PRICE = 30;
        int num = 10;
        int total;
        total = num * PRICE;
        System.out.println("total = "+total);
    }
}

 

 

例2.4 强制类型转换

public class Demo2_4 {
    public static void main(String[] args) {
        float x;
        int i;
        x = 3.6f;
        i = (int) x;
        System.out.println("x = "+x+",i = "+i);

    }
}

 

 

例2.5 将有符号数据传送给无符号变量