短整型 short

short minAge = 18;          // 购物年龄限制
short travelYear = 2018;    // 出行年份
short minHeight = 120;      // 最低身高要求120cm
short maxWeight = 150;      // 最大体重150kg
short examScore = 100;      // 考试满分100分
short heartRate = 72;       // 心率72次/分

/**
 * 飞翔科技 - short 类型演示
 * 场景：飞翔旅游平台的出行信息（年龄、年份、限高都在short范围内）
 */
public class ShortTravelDemo {
    public static void main(String[] args) {
        // 旅游场景数据
        short travelYear = 2018;       // 出行年份
        short minHeight = 120;         // 最低身高120cm
        short maxWeight = 150;         // 最大体重150kg
        short dailyVisitorLimit = 1000; // 日限流（short最大32767，够用）
        
        // 游客信息
        short visitorAge = 25;
        short visitorHeight = 175;
        short visitorWeight = 68;
        
        // 资格校验
        boolean ageOk = visitorAge >= 18;
        boolean heightOk = visitorHeight >= minHeight;
        boolean weightOk = visitorWeight <= maxWeight;
        boolean allOk = ageOk && heightOk && weightOk;
        
        System.out.println("【飞翔旅游 - 景区资格校验】");
        System.out.println("出行年份：" + travelYear + "年");
        System.out.println("游客年龄：" + visitorAge + "岁 " + (ageOk ? "✓" : "✗需满18岁"));
        System.out.println("游客身高：" + visitorHeight + "cm " + (heightOk ? "✓" : "✗最低" + minHeight + "cm"));
        System.out.println("游客体重：" + visitorWeight + "kg " + (weightOk ? "✓" : "✗最大" + maxWeight + "kg"));
        System.out.println("日限流：" + dailyVisitorLimit + "人");
        System.out.println("综合结果：" + (allOk ? "允许参与" : "不满足条件"));
        
        System.out.println("\n【类型信息】");
        System.out.println("short 最小值：" + Short.MIN_VALUE);
        System.out.println("short 最大值：" + Short.MAX_VALUE);
        System.out.println("short 位数：" + Short.SIZE + " bit");
    }
}

/**
 * 飞翔科技 - short 运算演示
 * 场景：小崔计算运动心率范围，发现short+short结果是int
 */
public class ShortOperationDemo {
    public static void main(String[] args) {
        short baseHeartRate = 72;     // 静息心率
        short exerciseRate = 135;     // 运动心率
        short maxSafeRate = 180;      // 最大安全心率
        
        // short 运算自动提升为 int
        // short sum = baseHeartRate + exerciseRate;  // 编译错误！
        int totalRate = baseHeartRate + exerciseRate;  // int 接收
        
        // 需要 short 结果时强制转换
        short avgRate = (short) ((baseHeartRate + exerciseRate) / 2);
        
        // short 的比较运算也自动提升
        boolean isSafe = exerciseRate < maxSafeRate;
        
        System.out.println("【飞翔运动 - 心率分析】");
        System.out.println("静息心率：" + baseHeartRate + " 次/分");
        System.out.println("运动心率：" + exerciseRate + " 次/分");
        System.out.println("合计心率：" + totalRate + " 次/分（int类型）");
        System.out.println("平均心率：" + avgRate + " 次/分（强转回short）");
        System.out.println("安全范围内：" + isSafe);
        System.out.println("最大安全心率：" + maxSafeRate + " 次/分");
    }
}

// ❌ 错误：32768 超出 short 最大值 32767
short value = 32768;  // 编译错误：incompatible types: possible lossy conversion from int to short

// ✅ 正确：在范围内
short value = 32767;  // 合法

// ❌ 错误：short 运算结果是 int，不能直接赋给 short
short a = 100;
short b = 200;
short sum = a + b;  // 编译错误

// ✅ 正确：强转或改用 int
short sum = (short) (a + b);   // 方式一：强转
int sumInt = a + b;            // 方式二：直接用int（推荐）

// ❌ 危险：short 最大值 32767 + 1 = -32768（溢出回绕）
short max = 32767;
short overflow = (short) (max + 1);
System.out.println(overflow);  // 输出 -32768（不是期待的 32768）

// ✅ 正确：用更大类型 int 存储
int safeValue = max + 1;  // 32768