Using underscore in Numeric Literals in Java

A new feature was introduced by JDK 7 which allows writing numeric literals using the underscore character. Basically, they are broken to enhance readability. This feature enables us to separate groups of digits in numeric literals, which improves the readability of code. For instance, if our code contains numbers with many digits, we can use an underscore character to separate digits in groups of three, similar to how we would use a punctuation mark like a comma, or a space, as a separator. Let us explore further with an example

Example

Java

// Java Program to Illustrate Different Ways of Usage
// of Underscore in Numeric Literals

// Main class
class GFG {

    // Main driver method
    public static void main(String[] args)
        throws java.lang.Exception
    {

        // Declaring and initializing values of
        // integer, long, float and double datatype

        // Integer literal
        int inum = 1_00_00_000;
        // Long literal
        long lnum = 1_00_00_000;
        // Float literal
        float fnum = 2.10_001F;
        // Double literal
        double dnum = 2.10_12_001;

        // Printing and displaying values on console
        System.out.println("inum:" + inum);
        System.out.println("lnum:" + lnum);
        System.out.println("fnum:" + fnum);
        System.out.println("dnum:" + dnum);
    }
}

Output

inum:10000000
lnum:10000000
fnum:2.10001
dnum:2.1012001