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Question about the task

Mastering the static block

Java Core, Level 5, Lesson 12

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1. In separate files, create Plane and Helicopter classes that implement the CanFly interface.
2. The Plane class must have a constructor with an int parameter (the number of passengers on board).
3. In the Solution class's static reset method:
3.1. Read a String from the console.
3.2. If the value is "helicopter", then assign a Helicopter object to the static CanFly field result.
3.3. If the value is "plane", then read a second value (an int, the number of passengers), and assign a Plane object to the static CanFly field result.
4. In the static block, initialize the CanFly field result by calling the reset method.
5. Close the input stream with the close() method.

Requirements:

The Plane class must be in a separate file and implement the CanFly interface.
The Helicopter class must be in a separate file and implement the CanFly interface.
The Plane class must have a constructor with an int parameter.
The Solution class must implement the public static void reset() method.
The reset method should read lines from the keyboard.
If the input string is "helicopter", a Helicopter object should be stored in the variable result.
If the input string is "plane", a Plane object should be stored in the variable result.
The Solution class's field result must be initialized in the static block by calling the reset method.

package com.codegym.task.task15.task1529; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; /* Mastering the static block */ public class Solution { public static void main(String[] args) { } static { Solution.reset(); } public static CanFly result; public static void reset() { try { BufferedReader bf = new BufferedReader(new InputStreamReader(System.in)); String s = bf.readLine(); int i = Integer.parseInt(bf.readLine()); if(s.equalsIgnoreCase("helicopter")) Solution.result = new Helicopter(i); else if(s.equalsIgnoreCase("plane")) Solution.result = new Plane(i); bf.close(); }catch (IOException e){ e.printStackTrace(); } } }

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Abdulaziz

Level 16 , Tashkent, Uzbekistan

20 September 2019, 05:44

static { reset(); //write your code here } public static CanFly result; public static void reset() { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); try { String st = reader.readLine(); if (st.equals("helicopter")){ result = new Helicopter(); }else if (st.equals("plane")){ int i = Integer.parseInt(reader.readLine()); result = new Plane(i); } } catch (IOException e) { e.printStackTrace(); } finally { try { reader.close(); } catch (IOException e) { e.printStackTrace(); } } //write your code here }

Niladri pradhan

Level 33 , Mumbai, India

19 August 2019, 12:15

Thanks i did not see that

Azja

Level 32 , Krakow, Poland

19 August 2019, 10:35

There is not mentioned that Helicopter class should have constructor with int passengers. Only when input string is "plane" you should read int passengers so place "i" variable to "else if" and place "bf.close()" after try catch block or in finally block. In the next lessons you will learn about try with resources