How to display double or float data with 2 decimal places in Java?

There are multiple approaches to display double or float data with 2 decimal places in Java. The post presents a way using DecimalFormat.


		double d = 31.236567;
		DecimalFormat df = new DecimalFormat("#.##");
		System.out.println(df.format(d));

double d = 31.236567;

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

System.out.println(df.format(d));

output:
31.24

If you want to format any double number to currency supported format with 2 decimal places, (for example, change 4 to 4.00, 45.5 to 45.50), we can implement it as


	public static String format(double amount) {
		DecimalFormat df = new DecimalFormat("#.##");
		String str = df.format(amount); 
		int index = str.indexOf(".");
		if(index == -1) { return str +".00"; }
		else if((str.length() - 1 - index) == 1)  { return str + "0"; }
		else { return str; }
	}