incompatible types required: int found: java.lang.String (basic programming)

Question

I have come across this error a few times, and I try many things to fix it, but I can't seem to find out what is going wrong. here is the code:

import java.util.Scanner;
public class InputExample {
    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);
        String name1 = scan.nextLine();
        String name2 = scan.nextLine();
        int num1 = scan.nextLine();
        double num2 = scan.nextLine();

        System.out.println("Employee Name:" + name2 + name1);
        System.out.println("Age:" + num1);
        System.out.println("Salary:" + (double)num2);
    }
}

And the error that shows up specicfically is:

[File: /InputExample.java Line: 9, Column: 25] incompatible types required: int found: java.lang.String

[File: /InputExample.java Line: 10, Column: 28] incompatible types required: double found: java.lang.String

It's because scan.nextLine(); returns a String and you are trying to assign that returned String to an int. You need scan.nextInt(); I think. — OldCurmudgeon
– OldCurmudgeon, Commented May 20, 2015 at 16:27

Watte · Accepted Answer · 2015-05-20 18:09:27Z

3

You're reading in a String, but want to save it as Integer/Double. Try this:

int num1 = Integer.valueOf(scan.nextLine());

Same goes for Double.

Or as OldCurmudgeon mentioned:

int num1 = scan.nextInt();

edited May 20, 2015 at 18:09

answered May 20, 2015 at 16:27

Watte

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2 Comments

OldCurmudgeon Over a year ago

scan.nextInt(); may be better.

OldCurmudgeon Over a year ago

You can change it in your answer - considered good practice to make your answer the best you can.

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