Check out example codes for "how to format a double in java to 2 decimal places". It will help you in understanding the concepts better.

Code Example 1

DecimalFormat df = new DecimalFormat("#.00");

Code Example 2

double input = 3.14159265359;
System.out.format("double : %.2f", input); // 3.14
System.out.println("double : " + String.format("%.2f", input)); // 3.14

Code Example 3

printf(%.2f);

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