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改进这个问题
我想做一个长度转换器，可以把脚转换成其他单位，如微米，毫米。。。。。。当我试着运行它时，它只是一直在加载，有时会显示[object]…（我不知道[object]是不是一个错误）

import java.util.Scanner;
public class Converter{
public static void calculateMicro(double number){
double answer =   304796.293632 * number;
System.out.print ("The answer is: " + answer );
}
public static void calculateMilli(double number){
double answer =   304.8 * number;
System.out.print ("The answer is: " + answer );
}
public static void calculateCenti(double number){
double answer =   30.48 * number;
System.out.print ("The answer is: " + answer );
}
public static void calculateMeter(double number){
double answer =   0.3048 * number;
System.out.print ("The answer is: " + answer );
}
public static void calculateKilo(double number){
double answer =   0.0003048 * number;
System.out.print ("The answer is: " + answer );
}
public static void main (String args[]) {
Scanner sc = new Scanner(System.in);
double number = sc.nextDouble();
int x = 1;
int option = sc.nextInt();
while(x==1){
   System.out.println("1.micrometer  2.millimeter  3.centimeter  4.meter  5. kilometer");
  if(option==1){
    calculateMicro(number);
  }
  else if(option==2){
    calculateMilli(number);
  }
  else if(option==3){
    calculateCenti(number);
  }
  else if(option==4){
    calculateMeter(number);
  }
  else if(option==5){
    calculateKilo(number);
  }
}