Jdk7 - Underscore in Numeric literals...

In JDK 7, you could insert underscore(s) '_' in between the digits in an numeric literals (integral and floating-point literals) to improve readability. This is especially valuable for people who uses large numbers in source files, may be useful in finance and computing domain.

int billion = 1_000_000_000; // 10^9
  long creditCardNumber = 1234_4567_8901_2345L; //16
digit number long ssn = 777_99_8888L; double
pi = 3.1415_9265; float pif = 3.14_15_92_65f;