java控制浮点数输出格式

import java.util.*;

import java.math.*;

import java.text.DecimalFormat;

public class Main {

public static void main(String args[])

{

Scanner cin=new Scanner(System.in);

double x1,y1,x2,y2;

DecimalFormat df = new DecimalFormat("0.00");

while(cin.hasNext())

{

x1=cin.nextDouble();

y1=cin.nextDouble();

x2=cin.nextDouble();

y2=cin.nextDouble();

double temp;

temp=Math.sqrt(((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)));

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

}

}

}