
Answer:
import java.util.*;
public class Main
{
public static void main(String[] args) {
 Scanner input = new Scanner(System.in);
 float weight, height,bmi;
 System.out.print("Enter weight (kg) and height(m): ");
 weight = input.nextFloat();
 height = input.nextFloat();
 bmi = (weight)/(height*height);
 System.out.print("BMI: "+bmi);
}
}
Explanation:
This declares all variables as float
 float weight, height,bmi;
This prompts the user to enter weight and height
 System.out.print("Enter weight (kg) and height(m): ");
This next two lines get input from the user for weight and height
 weight = input.nextFloat();
 height = input.nextFloat();
This calculates the bmi
 bmi = (weight)/(height*height);
This prints the bmi
 System.out.print("BMI: "+bmi);