Thread: Linked list insertion by console

Whats wrong with my code?
While compiling:



LinkedListInsertion.java:40: error: cannot find symbol
arr[i]=Integer.parseInt(br.readline());
^
symbol: method readline()
location: variable br of type BufferedReader
1 error



code is as follos:
import java.io.*;
public class LinkedListInsertion{
Node head;
static class Node{
Node next;
int data;
Node(int data,LinkedListInsertion list){
this.data = data;
next = null;
}
}
public static LinkedListInsertion insert(LinkedListInsertion list,int data){
Node new_node=new Node(data,list);
Node last;
if(list.head==null){
list.head = new_node;
}
else{
last = list.head;
while(last.next!=null){
last = last.next;
}
last.next = new_node;
}
return list;
}
public static void printList(LinkedListInsertion list){
Node currNode = list.head;
System.out.print("LinkedListAB: ");
while (currNode != null){
System.out.print(currNode.data + " ");
currNode = currNode.next;
}
}
public static void main(String[] args){
int[] arr=new int[5];
LinkedListInsertion mylist=new LinkedListInsertion();
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
for(int i=1; i<=5; i++){
arr[i]=Integer.parseInt(br.readline());
mylist = insert(mylist,arr[i]);
}
printList(mylist);
}
}

your advice of spell check solved half of the problem.
But now while compiling:
LinkedListInsertion.java:75: error: unreported exception IOException; must be caught or declared to be thrown
arr[i]=Integer.parseInt(br.readLine());
1 error

import java.io.*;
public class LinkedListInsertion{
	Node head;
	static class Node{
		Node next;
		int data;
		Node(int data,LinkedListInsertion list){
			this.data = data;
			next = null;
		}
	}
	public static LinkedListInsertion insert(LinkedListInsertion list,int data){
		Node new_node=new Node(data,list);
		Node last;
		if(list.head==null){
			list.head = new_node;
		}
		else{
			last = list.head;
			while(last.next!=null){
				last = last.next;
			}
			last.next = new_node;
		}
		return list;
	}
	public static LinkedListInsertion deleteAtEnd(LinkedListInsertion list){  
		Node curr_node=list.head;
		if(curr_node.next==null){
				list.head=curr_node.next;
				return list;
		}
		Node prev_node=list.head;
		while(curr_node.next!=null){
			prev_node=curr_node;
			curr_node=curr_node.next;
		}
		prev_node.next=null;
		return list;
	}
	public static LinkedListInsertion deleteByKey(LinkedListInsertion list,int key){
		Node tmp=list.head;
		if(tmp!=null && tmp.data==key){
			list.head=tmp.next;
			return list;
		}
		Node prev=null;
		while(tmp.data!=key && tmp!=null){
			prev=tmp;
			tmp=tmp.next;
		}
		if(tmp!=null){
			prev.next=tmp.next;
		}
		if(tmp==null){
			System.out.println("Key not found");
		}
		return list;
 
	}
	public static void printList(LinkedListInsertion list){
		Node currNode = list.head; 
        System.out.print("LinkedList: "); 
		while (currNode != null){
			System.out.print(currNode.data + " "); 
			currNode = currNode.next; 
		}
		System.out.println();
	}
	public static void main(String[] args){
		int[] arr=new int[5];
		LinkedListInsertion mylist=new LinkedListInsertion();
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		for(int i=1; i<=5; i++){
			arr[i]=Integer.parseInt(br.readLine());
			mylist = insert(mylist,arr[i]);
		}
		printList(mylist);
 
		}
}