java中如何通过ArrayList获取使用输入

Question

For example if i typed 5 then arraylist should take five input 5 3 2 3 5 3

 import java.util.Scanner*; 
 import java.io.*;
 class Character { 
 public static void main(String[] args) 
 { 
    Scanner sc=new Scanner(System.in);
    // initializing ArrayList 
    int n=sc.nextInt();
    ArrayList<Integer> arr = new ArrayList<Integer>(n);
    for (int i=1; i<=n; i++) 
        arr.add(i); 

     System.out.println(arr);

     for (int i=0; i<arr.size(); i++) 
     System.out.print(arr.get(i)+" "); 
  }    
} 

This code is taking input from use input like if i types 5 then then it will take five input form 1 to five ie 1 2 3 4 5

Answer 1

You should use sc.nextInt() to get the input and add to the list arr.add(sc.nextInt());

List<Integer> arr = new ArrayList<>();
for (int i=1; i<=n; i++) {
    arr.add(sc.nextInt()); 
}

Answer 2

You need to ask the user for input inside your loop:

for (int i=1; i<=n; i++)
{  
    int j = sc.nextInt();
    arr.add(j);
}