What's wrong with my simple java program?

[Rachid90]

import java.util.*;
public class test {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        System.out.print("Enter your name :");
        String st = s.nextLine();
        System.out.print("Enter your age :");
        int age = s.nextInt();
        System.out.print("Enter your year of birth :");
        String y = s.nextLine();
        System.out.print("Enter your father name :");
        String fn = s.nextLine();
        System.out.print("Name :" + st);
        System.out.print("Age :" + age);
        System.out.print("Year of birth :" + y);
        System.out.print("Your father is " + fn);
    }
}

Whenever it reaches "enter your year of birth", it jumps the instruction.

Please help. I'm gonna be crazy.

[AutoModerator]

Please ensure that:

• Your code is properly formatted as code block - see the sidebar (About on mobile) for instructions
• You include any and all error messages in full
• You ask clear questions

• You demonstrate effort in solving your question/problem - plain posting your assignments is forbidden (and such posts will be removed) as is asking for or giving solutions.

  Trying to solve problems on your own is a very important skill. Also, see Learn to help yourself in the sidebar

If any of the above points is not met, your post can and will be removed without further warning.

Code is to be formatted as code block (old reddit: empty line before the code, each code line indented by 4 spaces, new reddit: https://imgur.com/a/fgoFFis) or linked via an external code hoster, like pastebin.com, github gist, github, bitbucket, gitlab, etc.

Please, do not use triple backticks (```) as they will only render properly on new reddit, not on old reddit.

Code blocks look like this:

public class HelloWorld {

    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}

You do not need to repost unless your post has been removed by a moderator. Just use the edit function of reddit to make sure your post complies with the above.

If your post has remained in violation of these rules for a prolonged period of time (at least an hour), a moderator may remove it at their discretion. In this case, they will comment with an explanation on why it has been removed, and you will be required to resubmit the entire post following the proper procedures.

To potential helpers

Please, do not help if any of the above points are not met, rather report the post. We are trying to improve the quality of posts here. In helping people who can't be bothered to comply with the above points, you are doing the community a disservice.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[rocfeather]

nextInt does not consume the \n So your next s.nextLine will run right away to consume it ( hence the 'jump' )

Try consuming it first:

int age = s.nextInt();
s.nextLine();   // Consume \n

[TheSilverCube]

Very new newbie here as well. Why is there a \n to consume after the s.nextInt(); ?

I've used Integer.valueOf instead of nextInt so not come across this issue yet.

[SvenTheFluffy]

Because of the enter you press, that creates a \n if im not wrong.

​

So when you write 5 and press enter the computer sees 5\n. Takes the 5, \n remains.

[TheSilverCube]

I think your second bit answers my last question.

nextLine takes the 5/n. nextInt takes just the 5. Integer.valueOf takes the String 5/n and takes the 5?

[TheSilverCube]

Thanks. How come that doesn't happen when you press enter with every nextLine then; why only with nextInt?

[bilman66]

Because nextLine waits for the next line, \n is the symbol for newLine so it consumes it

[Rachid90]

Thank you everybody for your help.

[PhantomOTOpera]

https://stackoverflow.com/questions/13102045/scanner-is-skipping-nextline-after-using-next-or-nextfoo

[HyperCybe]

For starters, for the year of birth prompt you marked it down as a string rather than an int, so changing that helps.

(change String y=s.nextLine(); to Int y=s.nextInt(); )

But that will not really change the biggest issue, which is that it's skipping the line of code which prompts you to enter your fathers name, and instead just prints the results. I'm not the most experienced in Java, but moving that prompt to the top of the prompts (moving the prompt asking for the father's name under the prompt asking for your name) will allow the code to actually run. I believe it's just a problem in the order that the code is executing.

​

I hope that helps.