system.console.readline() throws null pointer exception [duplicate]

Question

i am using the following simple code to read a line of string from console but get nullpointerexception, can you folks help:

import java.io.Console;

public class readline_String {

    public static void main(String[] args)
    {
        // TODO Auto-generated method stub

        //String str=System.console().readLine();
        System.out.println("Enter an input string:");
        Console c=System.console();
        String str=c.readLine();
        System.out.println("The input string is:");
        System.out.println(str);

    }

}

From the doc of System.console() : "Returns : The system console, if any, otherwise null." — Arnaud
– Arnaud, Commented Mar 6, 2018 at 10:40
Follow Java Naming Conventions: class names should start with uppercase. And don't use underscores, except for constants. — MC Emperor
– MC Emperor, Commented Mar 6, 2018 at 10:45

Maciej · Accepted Answer · 2018-03-06 10:43:51Z

2

Replace your code with:

    System.out.println("Enter an input string:");
    Scanner sc = new Scanner(System.in);
    String str = sc.nextLine();
    System.out.println("The input string is:");
    System.out.println(str);

answered Mar 6, 2018 at 10:43

Maciej

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1 Comment

Dilip Jena Over a year ago

Hi Maciej, thanks so much this works. Not sure why it doesn't work with system.console.readline()

Mamun Kayum · Accepted Answer · 2018-03-06 11:50:20Z

2

If you are trying in a IDE(ex: NetBeans) it might show NullPointerException

It shows proper output in a cmd: code:

public class InputConsole {
    public static void main(String[] args) {
        System.out.print("Enter something:");
String input = System.console().readLine();
        System.out.println("input: "+input);
    }
}

Output:

Alternatively you can use Scanner or BufferedReader

answered Mar 6, 2018 at 11:50

Mamun Kayum

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