Double 类中 NaN、POSITIVE_INFINITY 和其他一些常量的值设置是多少？

Question

NaN为以及类POSITIVE_INFINITY中的其他一些常量设置的值是多少Double？从源代码中，我看到它们被设置为自己，但是这是如何工作的呢？

public final class Double extends Number implements Comparable<Double> {
    public static final double POSITIVE_INFINITY = POSITIVE_INFINITY;
    public static final double NEGATIVE_INFINITY = NEGATIVE_INFINITY;
    public static final double NaN = NaN;
    public static final double MAX_VALUE = MAX_VALUE;
    public static final double MIN_VALUE = MIN_VALUE;

    ...
}

谢谢。

Answer 1

至少在OpenJDK 8、OpenJDK 9和OpenJDK 10中，它们在源代码中：

public static final double POSITIVE_INFINITY = 1.0 / 0.0;
public static final double NEGATIVE_INFINITY = -1.0 / 0.0;
public static final double NaN = 0.0d / 0.0;  // (*)
public static final double MAX_VALUE = 0x1.fffffffffffffP+1023;
public static final double MIN_VALUE = 0x0.0000000000001P-1022;

(*)如果您想知道“ d”...