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About Venkat-Raman Nagarajan

Venkat-Raman Nagarajan
Venkat works for a major IT firm in India and has more than a decade of experience working and managing Java projects for a banking client.

Java Float Datatype Example

The Float class wraps a value of primitive type float in an object. An object of type Float contains a single field whose type is float. In addition, this class provides several methods for converting a float to a String and a String to float, as well as other constants and methods useful when dealing with float. Let us look at some of the common methods used with an example.

1. Float datatype

Some of the commonly used methods of Float are:

  • int compareTo(Float anotherFloat): compares two Float objects numerically
  • double doubleValue(): Returns the value of this Float as a double after a widening primitive conversion
  • boolean equals(Object obj): Compares this object against the specified object
  • float floatValue(): Returns the float value of this Float object
  • int intValue(): Returns the value of this Float as an int after a narrowing primitive conversion
  • boolean isNaN(): Returns true if this Float value is a Not-a-Number (NaN), false otherwise
  • long longValue(): Returns value of this Float as a long after a narrowing primitive conversion
  • static float parseFloat(String s): Returns a new float initialized to the value represented by the specified String, as performed by the valueOf method of class Float
  • String toString(): Returns a string representation of this Float object
  • static Float valueOf(String s): Returns a Float object holding the float value represented by the argument string s

2. Java Float data type example

Let us now look at an example using all the methods discussed above.

FloatExample
public class FloatExample{
	public static void main(String args[]){
		float a = 10.25F;
		float b = 23.22F;
		
		
		Float aF = new Float(a);
		Float bF = new Float(b);
		
		// compareTo(Float)
		System.out.println("aF.compareTo(bF) :"+aF.compareTo(bF));
		
		// doubleValue()
		System.out.println("doubleValue(aF) :"+aF.doubleValue());
		
		// equals(Object)
		System.out.println("equals(Object) :"+aF.equals(bF));
		
		// floatValue()
		System.out.println("aF.floatValue :"+aF.floatValue());
		
		// intValue()
		System.out.println("bF.intValue :"+bF.intValue());
		
		// isNan()
		System.out.println("bF.isNan() :"+bF.isNaN());
		
		// longValue()
		System.out.println("bF.longValue :"+bF.longValue());
		
		// parseFloat
		System.out.println("parseFloat :"+Float.parseFloat("57.86"));
	}
}

The output for the above class would be as follows:

aF.compareTo(bF) :-1
doubleValue(aF) :10.25
equals(Object) :false
aF.floatValue :10.25
bF.intValue :23
bF.isNan() :false
bF.longValue :23
parseFloat :57.86

3. Download the Source Code

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You can download the full source code of this example here: Java Float Datatype Example
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