why buffered reader can't be static ?

Question about the task

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package com.codegym.task.task06.task0610; import java.io.BufferedReader; import java.io.InputStreamReader; /* ConsoleReader class */ public class ConsoleReader { static BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); public static String readString() throws Exception { String s = br.readLine(); return s; } public static int readInt() throws Exception { int a = Integer.parseInt(br.readLine()); return a; } public static double readDouble() throws Exception { double b = Double.parseDouble(br.readLine()); return b; } public static boolean readBoolean() throws Exception { boolean c = Boolean.parseBoolean(br.readLine()); if (c.equals("true")){ return true; } else if (c.equals("false")){ return false; } return false; return c; } public static void main(String[] args) { } }

Make the ConsoleReader class, which will have 4 static methods:
String readString() - reads a string from the keyboard
int readInt() - reads a number from the keyboard
double readDouble() - reads a fractional number from the keyboard
boolean readBoolean() - reads the string "true" or "false" from the keyboard and returns the corresponding boolean value (true or false)

Please note: In each method, create a variable to read data from the console (BufferedReader or Scanner).

Requirements:

The readString method must read and return a String.
The readInt method must read and return an int.
The readDouble method must read and return a double.
The readBoolean method must read and return a boolean value.

package com.codegym.task.task06.task0610; import java.io.BufferedReader; import java.io.InputStreamReader; /* ConsoleReader class */ public class ConsoleReader { static BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); public static String readString() throws Exception { String s = br.readLine(); return s; } public static int readInt() throws Exception { int a = Integer.parseInt(br.readLine()); return a; } public static double readDouble() throws Exception { double b = Double.parseDouble(br.readLine()); return b; } public static boolean readBoolean() throws Exception { boolean c = Boolean.parseBoolean(br.readLine()); return c; } public static void main(String[] args) { } }

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Dyrits

Level 22

11 July 2020, 09:30

Don't worry, your solution is better.

Jokeros

Level 11 , Paris, France

27 July 2019, 09:48

public class ConsoleReader { public static String readString() throws Exception { BufferedReader s = new BufferedReader(new InputStreamReader(System.in)); String a = s.readLine(); return a; } public static int readInt() throws Exception { BufferedReader i = new BufferedReader(new InputStreamReader(System.in)); int b = Integer.parseInt(i.readLine()); return b; } public static double readDouble() throws Exception { BufferedReader d = new BufferedReader(new InputStreamReader(System.in)); double c = Double.parseDouble(d.readLine()); return c; } public static boolean readBoolean() throws Exception { BufferedReader b = new BufferedReader(new InputStreamReader(System.in)); boolean d = Boolean.parseBoolean(b.readLine()); return d; } public static void main(String[] args) { } }

Milan

Level 15 , Veliko Srediste, Serbia

18 April 2019, 20:39

The object that you created the buffered reader names br can not be static. Static is reserved word for class, methods and attributes.

Guadalupe Gagnon

Level 37 , Tampa, United States

25 April 2019, 21:05

It can be used for class properties (which may be what you mean by attributes). The BufferedReader in this code is a class property of the ConsoleReader class.

Guadalupe Gagnon

Level 37 , Tampa, United States

18 April 2019, 15:52

useful

There are no restrictions from doing this in the real world, however, in this task, the requirements specifically say: "In each method, create a variable to read data from the console (BufferedReader or Scanner)."

dean

Level 8 , Deutschland, Germany

25 April 2019, 18:25

how to invoke/call either of the methods? i tried to call in the main method the code below this it raised an error:

int num1 = ConsoleReader.readInt(); // also tried readInt(); and it didn't work either

Guadalupe Gagnon

Level 37 , Tampa, United States

25 April 2019, 21:03

You do not need to do that if you do not want to, the main method is not tested. The task asks you to implement the 4 method, which you already have, the only problem is that you are not creating a BufferedReader or Scanner in each one. All you have to do is copy the code on line 12 starting after the static keyword, then paste it on the first line of each method, for example the readInt method would look like this:

public static int readInt() throws Exception {
   BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
   // ↑↑↑↑ this was a copy and paste from line 12
   int a = Integer.parseInt(br.readLine());
   return a;
}

once the changes are made, that code that you did share, from the main method, would need to be:

int num1 = readInt();

If you were going to export this class to another project, then code in that project would access the readInt method like this:

int num1 = ConsoleReader.readInt();