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Float/Double

layout: default title: Float and Double

The valueOf method for these two wrappers ignores leading and trailing whitespace.

The Float and Double classes provide constants related to floating-point values as defined by the IEEE 754 standard.

Practice Exercise

IEEE - the Institute of Electrical and Electronics Engineers - manages a number of standards related to computing, networking, and other technology. IEEE 754 defines the representation and behavior of floating-point values in hardware and software - rounding, bit formats, arithmetic operations, etc. Most modern hardware and software follows this standard for floating-point numbers.

  • NaN - Not a Number: 0 / 0

  • NEGATIVE_INFINITY: -1 / 0

  • POSITIVE_INFINITY: 1 / 0

  • MIN_VALUE:

  • Float: 2-149, 1.4e-45

  • Double: 2-1074, 4.9e-324

  • MAX_VALUE:

  • Float: (2-2-23)·2127, 3.4028235e38
  • Double: (2-2-52)·21023, 1.7976931348623157e308

Each of these is a pre-defined static field of its class:

public final class Float extends Number implements Comparable<Float> {
    //...
    public static final float POSITIVE_INFINITY = 1.0f / 0.0f;
    public static final float NEGATIVE_INFINITY = -1.0f / 0.0f;
    public static final float NaN = 0.0f / 0.0f;
    //...
}

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