# How To Use Decimalformat Java?

## How do you call DecimalFormat in Java?

If you need two (or more) different formats in a program, you can declare multiple instances of DecimalFormat.

1. import java.text. DecimalFormat;
2. public class Pennies {
3. public static void main(String[] args) {
4. float myBalance = 3426.07F;
5. float myInterest;
6. DecimalFormat dollarFormat = new DecimalFormat (“\$ #,##0.00”);

## What is DecimalFormat in Java?

public class DecimalFormat extends NumberFormat. DecimalFormat is a concrete subclass of NumberFormat that formats decimal numbers. It has a variety of features designed to make it possible to parse and format numbers in any locale, including support for Western, Arabic, and Indic digits.

## How do you do 2 decimal places in Java?

String strDouble = String. format(“%. 2f”, 1.23456); This will format the floating point number 1.23456 up-to 2 decimal places, because we have used two after decimal point in formatting instruction %.

## How do you use decimal places in Java?

Example 2: Round a Number using DecimalFormat This means we want num up to 3 decimal places. We also set the rounding mode to Ceiling, this causes the last given place to be rounded to its next number. So, 1.34567 rounded to 3 decimal places prints 1.346, 6 is the next number for 3rd place decimal 5.

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## How do I reduce decimal places in Java?

Approach 2: Using String matching approach

1. Convert the number into String.
2. Start the counter variable when “.” found in the String.
3. Increment the counter till decimal point.
4. Store the new String and parse it in double format.

## How do you divide in Java?

// Divide a literal by a literal; result is 5 int result = 10 / 2; // Divide a variable by another variable; result is 3 int a = 15; int b = 5; int result = a / b; When dividing integer types, the result is an integer type (see the previous chapter for the exact data type conversions for mathematical operations).

## Is Java DecimalFormat thread safe?

DecimalFormat isn’t thread – safe, thus we should pay special attention when sharing the same instance between threads.

## How does printf work in Java?

args) Method. The printf () method of Java PrintStream class is a convenience method which is used to write a String which is formatted to this output Stream. It uses the specified format string and arguments to write the string.

## What is a BigDecimal Java?

The BigDecimal class provides operation for arithmetic, comparison, hashing, rounding, manipulation and format conversion. This method can handle very small and very big floating point numbers with great precision. In java, BigDecimal consists of a random precision integer scale and a 32-bit integer scale.

## How do you round to 2 decimal places?

Rounding to decimal places

1. look at the first digit after the decimal point if rounding to one decimal place or the second digit for two decimal places.
2. draw a vertical line to the right of the place value digit that is required.
3. look at the next digit.
4. if it’s 5 or more, increase the previous digit by one.
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## How do you convert double to 2 decimal places in Java?

7 ways to format double to 2 decimal places in java

1. Using String’s format() method.
2. Using System.out.printf.
3. Using Formatter.
4. Using BigDecimal.
5. Using DecimalFormat.
6. Using NumberFormat.
7. Using Apache common library.

## How do you round a double to 2 decimal places in Java?

You can convert double or float to BigDecimal and use setScale() method to round double / float to 2 decimal places.

## What is magic number in Java?

In programming, a magic number is a numeric value that is used directly in the code. It is used for identification purposes.

## Can we convert string to double in Java?

We can convert String to double in java using Double. parseDouble() method.

## What is precision of double in Java?

Both Double and float data type are used to represent floating-point numbers in Java; a double data type is more precise than float. A double variable can provide precision up to 15 to 16 decimal points as compared to float precision of 6 to 7 decimal digits.