how to insert code-block in libreoffice doc code example

Example: PASTE CODE IN LIBREoffice WRITER

package qmul.ecs505.lab8;

/**
 * Fahrenheit F 
 * Celsius C 
 * Kelvin K
 */
public class TemperatureConverter {
    public static double FAHRENHEIT_MAX = 9900000000032d;
    public static double FAHRENHEIT_MIN = -459.67d;
    public static double CELSIUS_MAX = 5500000000000d;
    public static double CELSIUS_MIN = -273.15d;
    public static double KELVIN_MAX = 5500000000273.15d;
    public static double KELVIN_MIN = 0d;
        
    //Fahrenheit to Celsius
    double F2C(double tempF) throws IllegalArgumentException {
        if (tempF >= FAHRENHEIT_MIN && tempF <= FAHRENHEIT_MAX) {
            return ((tempF - 32) / 1.8);
        }
        throw new IllegalArgumentException();
      }
    double F2K(double tempF) throws IllegalArgumentException {
        if (tempF >= FAHRENHEIT_MIN && tempF <= FAHRENHEIT_MAX) {
            return ((tempF + 459.67) / 1.8);
        }
        throw new IllegalArgumentException();
    }
    double C2F(double tempC) throws IllegalArgumentException {
        if (tempC >= CELSIUS_MIN && tempC <= CELSIUS_MAX) {
            return (tempC * 1.8) + 32;
        }
        throw new IllegalArgumentException();
    }
    double C2K(double tempC) throws IllegalArgumentException {
         if (tempC >= CELSIUS_MIN && tempC <= CELSIUS_MAX) {
            return (tempC + 273.15);
        }
         throw new IllegalArgumentException();
    }
    double K2F(double tempK) throws IllegalArgumentException {
         if (tempK >= KELVIN_MIN && tempK <= KELVIN_MAX) {
            return ((tempK * 1.8) - 459.67);
        }
         throw new IllegalArgumentException();
    }
    double K2C(double tempK) throws IllegalArgumentException {
        if (tempK >= KELVIN_MIN && tempK <= KELVIN_MAX) {
            return (tempK - 273.15);
        }
        throw new IllegalArgumentException();
     }
 }