2025.11.18 Java中float浮点数除以0

浮点数除0不报错

由于IEEE 754 标准的设计特性

public class FloatDivisionTest {
    public static void main(String[] args) {
        // 浮点数除零不报错，返回特殊值
        float result1 = 1.0f / 0.0f;  // Float.POSITIVE_INFINITY
        float result2 = -1.0f / 0.0f; // Float.NEGATIVE_INFINITY
        float result3 = 0.0f / 0.0f;  // Float.NaN
        
        System.out.println("1.0f / 0.0f = " + result1);  // Infinity
        System.out.println("-1.0f / 0.0f = " + result2); // -Infinity
        System.out.println("0.0f / 0.0f = " + result3);  // NaN
        
        // 检查特殊值
        System.out.println("isInfinite: " + Float.isInfinite(result1)); // true
        System.out.println("isNaN: " + Float.isNaN(result3));           // true
    }
}

除零返回无穷大或者无穷小，或者时空

而整数的话，就会直接返回除零报错

// 整数除零：运行时立即抛出 ArithmeticException
try {
    int x = 1 / 0;  // 抛出 ArithmeticException: / by zero
} catch (ArithmeticException e) {
    System.out.println("整数除零异常: " + e.getMessage());
}