Java: Test whether a given double/float value is a finite floating-point value or not

Last update on March 11 2025 11:05:01 (UTC/GMT +8 hours)

Check Finite Floating-Point Value

Write a Java program to test whether a given double/float value is a finite floating-point value or not.

Sample Solution:

Java Code:

public class Main {
    public static void main(String[] args) {
        Double dn1 = 0.000213456321d;
        boolean d1f = Double.isFinite(dn1);
        Double dn2 = dn1 / 0;
        boolean d2f = Double.isFinite(dn2);
        Double dn3 = Double.POSITIVE_INFINITY * 0;
        boolean d3f = Double.isFinite(dn3);
        System.out.println("\nFinite doubles\n--------------");
        System.out.println("Is "+dn1 + " is finite? " + d1f);
        System.out.println("Is "+dn2 + " (dn1/0) is finite? " + d2f);
        System.out.println("Is "+dn3 + " is finite? " + d3f);
		Float fn1 = 5.3f;
        boolean f1f = Float.isFinite(fn1);
        Float fn2 = fn1 / 0;
        boolean f2f = Float.isFinite(fn2);
        Float fn3 = 0f / 0f;
        boolean f3f = Float.isFinite(fn3);
        System.out.println("\n\nFinite floats\n-------------");
        System.out.println("Is "+fn1 + " is finite? " + f1f);
        System.out.println("Is "+fn2 + " (fn1/0) is finite? " + f2f);
        System.out.println("Is "+fn3 + " is finite? " + f3f);
    }
}

Sample Output:

inite doubles
--------------
Is 2.13456321E-4 is finite? true
Is Infinity (dn1/0) is finite? false
Is NaN is finite? false


Finite floats
-------------
Is 5.3 is finite? true
Is Infinity (fn1/0) is finite? false
Is NaN is finite? false

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to determine whether a given floating-point number is finite, infinite, or NaN without using built-in methods.
• Write a Java program to check a list of floating-point numbers for finiteness and then count how many are non-finite.
• Write a Java program to validate floating-point inputs and display custom messages for infinite and NaN values.
• Write a Java program to simulate arithmetic operations on floating-point numbers and check the finiteness of the result after each operation.

Java Code Editor:

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