给小数点时,Java程序崩溃,但使用int

这些是我得到的错误：

at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
    at java.lang.Integer.parseInt(Integer.java:458)
    at java.lang.Integer.parseInt(Integer.java:499)
    at BMI.main(BMI.java:11)

这是我的代码：

import javax.swing.*;

public class BMI {
  public static void main(String args[]) {
    int height;  // declares the height variable
    int weight;  // declares the weight variable
    String getweight;
    getweight = JOptionPane.showInputDialog(null,"Please enter your weight in Kilograms");  // asks user for their weight
    String getheight;
    getheight = JOptionPane.showInputDialog(null,"Please enter your height in Centimeters");  // asks user for their height
    weight = Integer.parseInt(getweight);  // stores their weight
    height = Integer.parseInt(getheight);  // stores their height
    double bmi;  // declares the BMI variable
    bmi = weight / Math.pow(height / 100.0,2.0);  // calculates the BMI
    double roundbmi;  // variable to round the BMI to make it more read-able
    roundbmi = Math.round(bmi);  // rounds the BMI
    JOptionPane.showMessageDialog(null,"Your BMI is: " + roundbmi);  // displays the calculated and rounded BMI
  }
}