How to take multiple inputs via scanner from the user in the constructor?

Question

I want to initialize the constructor which is in another class with the multiple inputs taken in for loop in the main method of another class. but the output is coming only one input. kindly solve my problem.

s1.java

import java.util.*;
public class s1 {
    public static void main(String args[]) {
        String name="";int roll=0;
        Scanner sc=new Scanner(System.in);
        for(int i=0;i<2;i++) {
            name=sc.nextLine();
            roll=sc.nextInt();

            s2 sample=new s2(name,roll);

            sample.display();

        } 
    }
}

s2.java

public class s2 {
    String name="";int roll=0;
    s2(String name,int roll) {
        this.name=name;
        this.roll=roll;
    }
    void display() {
        System.out.println(name+" "+roll);
    }
}

Unrelated: use meaning full names please. First of all, java class names go UpperCamelCase ... and then s2 is a poor name. Why not "ExampleUser" or something alike? — GhostCat, Jul 01 '19 at 15:36

user7294900 · Accepted Answer · 2019-07-01T15:25:27.353

1

If you want more then 1 time change the condition i<2 which restrict loop for one iteration.

Change to i<10 for example for getting uoto 9 times (10-1) inputs/outputs

Add condition

 if(sc.hasNextInt()) {
      roll=sc.nextInt();
      s2 sample=new s2(name,roll);
      sample.display();
  }

edited Jul 01 '19 at 15:25

answered Jul 01 '19 at 15:16

user7294900

47,183
17
74
157

If the loop condition is increased then after displaying one input and after entering second input "InputMismatchException" error is displaying in the compiler. – Divyanshu Sharma Jul 01 '19 at 15:19
Add condition before it `if(sc.hasNextInt()) {` updated answer – user7294900 Jul 01 '19 at 15:24
Can you explain me the reason for using this condition and if we can use this condition then we can also use the same for String input? – Divyanshu Sharma Jul 01 '19 at 15:27
See https://stackoverflow.com/questions/12832006/scanner-error-with-nextint – user7294900 Jul 01 '19 at 15:29

How to take multiple inputs via scanner from the user in the constructor?

1 Answers1