This is new Java feature introduced in Java 7 just to improve the readability of codes like we can use an Underscore character to separate digits in group of three,similar to how we would use a punctuation Mark like comma, or a space,as a seperatot.
For example;
public class UnderscoreInLiteral
{
public static void main(String args[])
{
int num = 1_00_00_000;
System.out.println("Num:",num);
long num1 = 1_00_00_000;
System.out.println("Num",num1);
}
}
Output:
10000000
10000000
