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Java: Rounding Numbers (Math.round(), DecimalFormat & printf)

admin by admin
June 27, 2020
in Công Nghệ
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Java: Rounding Numbers (Math.round(), DecimalFormat & printf)



GitHub repo with examples
Java enables you to do almost anything, especially tasks involving numbers. But sometimes complicated calculations give you an answer with way too many decimals.
Most practical applications only require a few decimals. Here are 3 ways to round number in Java:

1) Using Math.round()
Java’s Math class is inherently included in every program you create so there is not need for an import statement. The round() method takes a number as an argument and rounds that number to the nearest integer. On it’s own this isn’t spectacularly helpful but you can combine it with an easy little trick.
Inside the parentheses of the round method, multiply your number by a power of 10. Then outside the parentheses, divide by the same power of 10. The number of zeros after the ‘1’ is the number of decimals you will have. For example: rounding to two decimals looks like this: Math.round( number * 100)/100.0; ONE OF THE NUMBERS MUST HAVE .0 AFTER IT OR JAVA WILL PERFORM INTEGER DIVISION!

2) Using System.out.printf()
The printf method is similar to print, but allows you to format the variables. The ‘f’ in ‘printf’ stands for format. To print a variable rounded to 2 decimal places the code is System.out.printf( “%.2f”, number); The % symbol tells java that what comes next is a formatted variable. The The %f is replaced with the ‘number’ variables and the ‘.2’ tells Java to display 2 decimals. Change the number after the period to the number of decimals you want.
NOTE: The printf method doesn’t change the actual contents of the variable. After using printf, the variable still has all the decimals.

3) Using DecimalFormat
The DecimalFormat class must be imported by the statement: import java.text.DecimalFormat;
Then create a reference variable to a DecimalFormat object: DecimalFormat dFormatter and set it equal to: new DecimalFormat(); In the parentheses, place “0.00” or “#.##” to round to 2 decimals. Add more zeros of ##’s after the period to change the number of decimals.
To round the variable, type: dFormatter.format(number) This uses the format() method of the DecimalFormat class to display the number the way you specified.
DecimalFormat formats variables as strings, so if you want to use a number for calculation you have to parse it back to double or float.

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Comments 44

  1. JacksMagicBean says:
    2 years ago

    Helped me finish a project in time. Thank you sir!

    Reply
  2. Tiosh says:
    2 years ago

    This doesn't work

    Reply
  3. Sandupa Egodage says:
    2 years ago

    thank You

    Reply
  4. Koo Kar Wai says:
    2 years ago

    This was very helpful. Thank you!

    Reply
  5. Professor Squid says:
    2 years ago

    thanks

    Reply
  6. Hybrid Gaming says:
    2 years ago

    thankyou

    Reply
  7. Nicholas Mercer says:
    2 years ago

    BROOOOO, tytytytyty

    Reply
  8. Anhjje says:
    2 years ago

    Math.round( value * 1000) / 1000.0 saved my ass for an assignment. Thank you!

    Reply
  9. Your Lover says:
    2 years ago

    you…….are ….. god……

    Reply
  10. Sodbuster says:
    2 years ago

    You can also simply do casting :

    double number = 3.141592653;

    double rounded = (int) (number * 100) / 100.0;

    System.out.println(rounded);

    3.14

    Reply
  11. SimonSays says:
    2 years ago

    thanks

    Reply
  12. Jesse Gonzalez says:
    2 years ago

    This help me so much THANK YOU !

    Reply
  13. Mr. Trashcan says:
    2 years ago

    Hey, nice 😀 Thanks, man!

    Reply
  14. Skrublaub says:
    2 years ago

    The rounding part saved me. Thank you!

    Reply
  15. Leo says:
    2 years ago

    Thank you very much kind sir. I'm a beginner and this helped me out a lot. Thank you!

    Reply
  16. Liyuan Boo says:
    2 years ago

    Thank you hero! Could you please tell me how to make user input to be 2 decimal??

    Reply
  17. mladboy says:
    2 years ago

    Wow, finally someone explains this in a succinct, but also very clear way! Thank you!

    Reply
  18. Patrick Gatt says:
    2 years ago

    didnt know badger from breaking bad taught java

    Reply
  19. Ahnaf Khan says:
    2 years ago

    Really helpful.Thanks man.

    Reply
  20. Kierstyn says:
    2 years ago

    thank you this really helped!

    Reply
  21. To Release is To Resolve says:
    2 years ago

    dude sounds like he wants to kill himself

    Reply
  22. Fezile Nkuna says:
    2 years ago

    Thanks.

    Reply
  23. Dr Gjengdahl says:
    2 years ago

    THANK YOU!!!!

    Reply
  24. Angel Peralta says:
    2 years ago

    Thank you. It really helped me!

    Reply
  25. 俊宇 says:
    2 years ago

    Thanks a lot !!! It very useful to me !!!!!!

    Reply
  26. Jacob French says:
    2 years ago

    I found the documentation for this function confusing. Now I understand. Thank you!

    Reply
  27. #LunaTutoriales says:
    2 years ago

    Muy bueno gracias!!!!

    Reply
  28. Phuong Huynh says:
    2 years ago

    Thank you!!! Remember for the formatting, it is important to have "%.2f", number. The comma is very important, do not put +

    Reply
  29. Christian's Grocery Vlogs says:
    2 years ago

    This is the most helpful thing I've ever seen. Quick, concise and I love your voice (it makes it more enjoyable).

    Reply
  30. Christian D says:
    2 years ago

    This video was very helpful. I was looking for so long for this… so simple yet so hard to find. 🙂

    Reply
  31. Sandy San says:
    2 years ago

    YOu are just a life save, thank you

    Reply
  32. Finn Grant says:
    2 years ago

    very helpful, thankyou. Ive been coding nearly half a year now and I stupidly forgot how to round to specified decimal places. I was midway through my program and realized I forgot one of the first things I learned

    Reply
  33. Smotteh says:
    2 years ago

    1:05 …

    Reply
  34. Void says:
    2 years ago

    Thanks

    Reply
  35. Ting Wang says:
    2 years ago

    really helpful! Thank you very much!

    Reply
  36. nsk8ter524 says:
    2 years ago

    Great Explanation. Thanks!

    Reply
  37. Clayton Wahlstrom says:
    2 years ago

    Well done!

    Reply
  38. Andres Lizondro says:
    2 years ago

    It Works. Gracias Amigo!

    Reply
  39. Michael Bridges says:
    2 years ago

    Awesome video.  Thanks!

    Reply
  40. Will hand says:
    2 years ago

    or when you multiply, you could multiply by .100…..
    impressive right.
    im a freaking genius

    Reply
  41. bro1029384756 says:
    2 years ago

    Try zooming in next time, useless video

    Reply
  42. YoungRace says:
    2 years ago

    Thank you so much 🙂

    Reply
  43. Afif Khaja says:
    2 years ago

    Excellent video. Thanks

    Reply
  44. rvbCabooservb says:
    2 years ago

    Thanks man, this was the video I was looking for.

    Reply

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