[JAVA] 소수점 반올림

double n = 1.23456;
System.out.println(Math.round(n));  // result : 1

double n = 1.23456;
System.out.println(Math.round(n * 10)/10);  // result : 1.2

double n = 1.23456;
System.out.println(Math.round(n * 100)/100); // result : 1.23

double n = 1.23456;
System.out.println(Math.round(n * 10000)/10000); // result : 1.2346