In Java, there are few ways to display double in 2 decimal places.
Table of contents.
Possible Duplicate
How to round double / float value to 2 decimal places
1. DecimalFormat(“0.00”)
We can use DecimalFormat("0.00") to ensure the number is round to 2 decimal places.
DecimalExample.java
package com.mkyong.math.rounding;
import java.math.RoundingMode;
import java.text.DecimalFormat;
public class DecimalExample {
private static final DecimalFormat df = new DecimalFormat("0.00");
public static void main(String[] args) {
double input = 3.14159265359;
System.out.println("double : " + input);
System.out.println("double : " + df.format(input)); //3.14
// DecimalFormat, default is RoundingMode.HALF_EVEN
df.setRoundingMode(RoundingMode.DOWN);
System.out.println("\ndouble (RoundingMode.DOWN) : " + df.format(input)); //3.14
df.setRoundingMode(RoundingMode.UP);
System.out.println("double (RoundingMode.UP) : " + df.format(input)); //3.15
}
}
Output
Terminal
double : 3.14159265359
double : 3.14
double (RoundingMode.DOWN) : 3.14
double (RoundingMode.UP) : 3.15
Note
You may interest at this article – DecimalFormat("#.##") or DecimalFormat("0.00")
2. String.format(“%.2f”)
We also can use String formater %2f to round the double to 2 decimal places. However, we can’t configure the rounding mode in String.format, always rounding half-up.
StringFormatExample.java
package com.mkyong.math.rounding;
public class StringFormatExample {
public static void main(String[] args) {
double input = 3.14159265359;
System.out.println("double : " + input);
System.out.println("double : " + String.format("%.2f", input));
System.out.format("double : %.2f", input);
}
}
Output
Terminal
double : 3.14159265359
double : 3.14
double : 3.14
3. BigDecimal
BigDecimalExample.java
package com.mkyong.math.rounding;
import java.math.BigDecimal;
import java.math.RoundingMode;
public class BigDecimalExample {
public static void main(String[] args) {
double input = 3.14159265359;
System.out.println("double : " + input);
BigDecimal bd = new BigDecimal(input).setScale(2, RoundingMode.HALF_UP);
double newInput = bd.doubleValue();
System.out.println("double : " + newInput);
}
}
Output
Terminal
double : 3.14159265359
double : 3.14
great, tnx
It even works with JOptionPane! Thank you!
Best Tutorial ever. Thank you somuch.. even stack overflow is outdated
Method 2 works like a charm! Thanks man.
thank you
when you change the value to 1.5 it returns 1.5, I want it to return 1.50.What should I do?
change #.## to #.00
Thanks .it worked
God bless you man 😀
cool
I realize that when comes to 7.00 and it become 7. But I want it as 7.00. Any Idea?
I fixed it, just simply change from “#.##” to “#.00”
Just use String.format(“%.2f”, 7.00);
DecimalFormat("0.00")thank you…
that was very helpful.
When using the String.format example do you know how it rounds? Is it HALF / UP / or DOWN.
I know it does not have those constants but the formula behind the .format method must round it one of those 3 ways right?
half up.
Read this
https://bugs.openjdk.java.net/browse/JDK-8185777
https://docs.oracle.com/javase/8/docs/api/java/util/Formatter.html
Hello,
Can you share Java code or script for finding P-value of large data sets:-
eg:-
Input File (.txt format/or any)
Name X Y Z
A_1 1.7085586 0.73179674 3.3962722
A_2 0.092749596 -0.10030079 -0.47453594
A_3 1.1727467 0.15784931 0.0572958
A_4 -0.91714764 -0.62808895 -0.6190882
A_5 0.34570503 0.10605621 0.30304766
This should be the Input format in form of text file or Excel sheet
and the outPut should be:-
Name p_Value
A_1 0.129618297992839
A_2 0.436354399799269
A_3 0.323631285199105
A_4 0.0179166576112724
A_5 0.0763318283011515
I have done it in R programming, but I want to this by using Java, but I am a beginner in Java so …..
Any help would be appreciable……..
Thank you….
Read this
https://www.mkyong.com/java/how-to-read-and-parse-csv-file-in-java/
you need OpenCSV
Hi, mkyong? Can I use code from your examples anyway I want? I mean create my own example based on yours and post it somewhere?
ok, no problem.
What about:
package com.mkyong.loan;
public class Test{
public static void main(String[] args) {
double input = 32.123456;
System.out.println(“double : ” + input);
System.out.printf(“double : %.2fn”, input);
}
}
It works.
System.out.printf("double : %.2f", input);