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Thread: What is wrong with my code.

  1. #1
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    Default What is wrong with my code.

    I looked up some Java problems and made a code for one but it keeps giving the same error on the public classes
    import java.util.Scanner;
    public class NumbersDemo
    [{
    public static void main (String args[])
    {
    int a = 5;
    int b = 7;
    }
    public static void displayNumberPlus10(a) {
    System.out.println(a+10);
    }
    public static void displayNumberPlus10(b) {
    System.out.println(b+10);
    }
    public static void displayNumberPlus100(a) {
    System.out.println(a+100);
    }
    public static void displayNumberPlus100(b) {
    System.out.println(b+100);
    }
    public static void displayNumberPlus1000(a) {
    System.out.println(a+1000);
    }
    public static void displayNumberPlus1000(b) {
    System.out.println(b+1000);
    }
    public static void displayTwiceTheNumber(a) {
    System.out.println(a*2);
    }
    public static void displayTwiceTheNumber(b) {
    System.out.println(b*2);
    }

    }]

    It keeps giving me this error and I cant seem to fix it

    ----jGRASP exec: javac -g NumbersDemo.java
    NumbersDemo.java:9: error: <identifier> expected
    public static void displayNumberPlus10(a) {
    ^
    NumbersDemo.java:12: error: <identifier> expected
    public static void displayNumberPlus10(b) {
    ^
    NumbersDemo.java:15: error: <identifier> expected
    public static void displayNumberPlus100(a) {
    ^
    NumbersDemo.java:18: error: <identifier> expected
    public static void displayNumberPlus100(b) {
    ^
    NumbersDemo.java:21: error: <identifier> expected
    public static void displayNumberPlus1000(a) {
    ^
    NumbersDemo.java:24: error: <identifier> expected
    public static void displayNumberPlus1000(b) {
    ^
    NumbersDemo.java:27: error: <identifier> expected
    public static void displayTwiceTheNumber(a) {
    ^
    NumbersDemo.java:30: error: <identifier> expected
    public static void displayTwiceTheNumber(b) {
    ^
    8 errors

    ----jGRASP wedge2: exit code for process is 1.
    ----jGRASP: operation complete.



    Please help
    Last edited by Kyrocco; October 22nd, 2019 at 08:52 AM.

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: What is wrong with my code.

    NumbersDemo.java:9: error: <identifier> expected
    public static void displayNumberPlus10(a) {
    There needs to be a definition for the data type of the method's argument. For example:
    public static void displayNumberPlus10(int a) {


    Please edit your post and wrap your code with code tags:

    [code]
    **YOUR CODE GOES HERE**
    [/code]

    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following User Says Thank You to Norm For This Useful Post:

    Kyrocco (October 22nd, 2019)

  4. #3
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    Default Re: What is wrong with my code.

    Ok that fixed that error but now it gives the error, **error: method displayNumberPlus100(int) is already defined in class NumbersDemo**, for every (int b)

  5. #4
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    Default Help please

    I was writing some practice codes and keep getting the same error.


    import java.util.Scanner;
    public class NumbersDemo
    {
    public static void main (String args[])
    {
    int a = 5;
    int b = 7;
    }
    public static void displayNumberPlus10(int a) {
    System.out.println(a+10);
    }
    public static void displayNumberPlus10(int b) {
    System.out.println(b+10);
    }
    public static void displayNumberPlus100(int a) {
    System.out.println(a+100);
    }
    public static void displayNumberPlus100(int b) {
    System.out.println(b+100);
    }
    public static void displayNumberPlus1000(int a) {
    System.out.println(a+1000);
    }
    public static void displayNumberPlus1000(int b) {
    System.out.println(b+1000);
    }
    public static void displayTwiceTheNumber(int a) {
    System.out.println(a*2);
    }
    public static void displayTwiceTheNumber(int b) {
    System.out.println(b*2);
    }

    }



    I continue to get the error, ***error: method displayNumberPlus100(int) is already defined in class NumbersDemo***

  6. #5
    Super Moderator Norm's Avatar
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    Default Re: What is wrong with my code.

    method displayNumberPlus100(int) is already defined
    You can only define a method with the same arguments once in a class.

    Take a look at the tutorial: https://docs.oracle.com/javase/tutor...O/methods.html

    Look at how to use code tags again. the full text must be used not just a [
    If you don't understand my answer, don't ignore it, ask a question.

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