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Chapter 3: Problem 37

Assume that the double variable number holds the value \(7634869.1 .\) What format pattern would you use with a DecimalforMat object to display the number as \(7,634,869.10 ?\)

Short Answer

Expert verified
A: To display a double variable in Java with the desired format, you need to use the DecimalFormat class. First, import the class from the 'java.text' package, then create a DecimalFormat object with the format pattern "#,##0.00". Apply the format pattern to the given double variable using the 'format' method of the DecimalFormat object, and then display the formatted number as a string.

Step by step solution

01

Import DecimalFormat class

First, we need to import the DecimalFormat class from the 'java.text' package. ```java import java.text.DecimalFormat; ```
02

Create a DecimalFormat object

Next, we need to create a DecimalFormat object with the appropriate format pattern. The format pattern we need is "#,##0.00". This pattern means there should be a comma for every three digits before the decimal point and have two decimal places. ```java DecimalFormat decimalFormat = new DecimalFormat("#,##0.00"); ```
03

Apply the format pattern to the given number

Now, we will apply the format pattern to the given double variable 'number' using the 'format' method of the DecimalFormat object. ```java double number = 7634869.1; String formattedNumber = decimalFormat.format(number); ```
04

Display the formatted number

Finally, we will display the formatted number as a string. ```java System.out.println("Formatted number: " + formattedNumber); ``` When you run the program, it will output: ``` Formatted number: 7,634,869.10 ```

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