Float

Float Wrapper Class in Java

Overview

The Float class in Java is a wrapper class for the primitive float type. It provides utility methods to work with single-precision floating-point numbers and is part of the java.lang package.

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Key Features of the Float Wrapper Class

1. Boxing and Unboxing: Automatic conversion between primitive types and the Float wrapper class.
2. Constants: The class provides constants like MAX_VALUE, MIN_VALUE, POSITIVE_INFINITY, etc.
3. Utility Methods: Methods for parsing, converting, and performing mathematical operations on float values.

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Float Wrapper Class Operations

Arithmetic Operations

Operation	Symbol	Example
Addition	+	floatValue + floatValue
Subtraction	-	floatValue - floatValue
Multiplication	*	floatValue * floatValue
Division	/	floatValue / floatValue
Modulo	%	floatValue % floatValue

Relational Operations

Operation	Symbol	Example
Equal to	==	floatValue == floatValue
Not equal to	!=	floatValue != floatValue
Greater than	>	floatValue > floatValue
Less than	<	floatValue < floatValue
Greater than or equal to	>=	floatValue >= floatValue
Less than or equal to	<=	floatValue <= floatValue

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Static Methods

Method	Description	Example
compare(float f1, float f2)	Compares two float values.	Float.compare(3.2f, 4.1f) → Returns -1
parseFloat(String s)	Parses a String as a primitive float.	Float.parseFloat("3.14") → Returns 3.14f
toHexString(float f)	Converts a float to its hexadecimal string representation.	Float.toHexString(3.14f) → Returns "0x1.91eb86p1"
isNaN(float v)	Checks if the value is "Not-a-Number" (NaN).	Float.isNaN(Float.NaN) → Returns true
isInfinite(float v)	Checks if the value is infinite.	Float.isInfinite(Float.POSITIVE_INFINITY) → Returns true

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Instance Methods

Method	Description	Example
compareTo(Float anotherFloat)	Compares this Float object with another.	Float.valueOf(3.2f).compareTo(Float.valueOf(4.1f)) → Returns -1
equals(Object obj)	Checks if this object is equal to another.	Float.valueOf(3.2f).equals(Float.valueOf(3.2f)) → Returns true
isInfinite()	Checks if the value is infinite.	Float.valueOf(Float.POSITIVE_INFINITY).isInfinite() → Returns true
isNaN()	Checks if the value is "Not-a-Number" (NaN).	Float.valueOf(Float.NaN).isNaN() → Returns true
toString()	Returns a string representation of the value.	Float.valueOf(3.14f).toString() → Returns "3.14"
hashCode()	Returns the hash code for the object.	Float.valueOf(3.14f).hashCode()
byteValue()	Converts the Float value to a byte.	Float.valueOf(3.2f).byteValue() → Returns 3
shortValue()	Converts the Float value to a short.	Float.valueOf(3.2f).shortValue() → Returns 3
intValue()	Converts the Float value to an int.	Float.valueOf(3.2f).intValue() → Returns 3
longValue()	Converts the Float value to a long.	Float.valueOf(3.2f).longValue() → Returns 3L
floatValue()	Returns the primitive float value of this Float object.	Float.valueOf(3.2f).floatValue() → Returns 3.2f

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Relational Operators and Their Equivalent Methods

Operator	Operator Usage	Equivalent Method	Usage
==	value1 == value2; // false	equals(Object)	Float.valueOf(value1).equals(value2); // false
!=	value1 != value2; // true	!equals(Object)	!Float.valueOf(value1).equals(value2); // true
<	value1 < value2; // true	compare(float, float)	Float.compare(value1, value2) < 0; // true
>	value1 > value2; // false	compare(float, float)	Float.compare(value1, value2) > 0; // false
<=	value1 <= value2; // true	compare(float, float)	Float.compare(value1, value2) <= 0; // true
>=	value1 >= value2; // false	compare(float, float)	Float.compare(value1, value2) >= 0; // false

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Example Code for Float Wrapper Class

public class FloatWrapperExample {
    public static void main(String[] args) {
        // Float Examples
        Float floatValue = Float.valueOf(3.14f);
        System.out.println("Float as double: " + floatValue.doubleValue());
        System.out.println("Hexadecimal Representation (Float): " + Float.toHexString(3.14f));

        // Comparing Floats
        int compareResult = Float.compare(3.14f, 2.5f);
        System.out.println("Comparison Result (Float): " + compareResult);

        // Parsing Strings
        float parsedFloat = Float.parseFloat("2.71");
        System.out.println("Parsed Float: " + parsedFloat);

        // Converting Float to other types
        int intValue = floatValue.intValue();
        System.out.println("Float as Int: " + intValue);
    }
}

For more: FloatWrapperClass.java