Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at Lab33.twoListAdd(Lab33.java:64)
at Lab33.main(Lab33.java:18)

他說我的堆積超出 可是我不太確定 因為我並沒有設很多的變數

我的程式是想加總兩個鏈結串列內的值

還請大大們幫我看看 是哪邊出錯 謝謝

import java.io.*;
import java.util.*;

class ListNode {
		int value;
		ListNode nextNode = null;
		public ListNode(int value) {
			this.value = value;
		} 
    }
 
public class Lab33 {
	
	public static void main(String[] args) throws IOException {
		Scanner input = new Scanner(System.in);	
		ListNode linkedList1 = creatLinkedList();
		ListNode linkedList2 = creatLinkedList();
		ListNode linkedListSum = twoListAdd(linkedList1, linkedList2);
		
		while(linkedListSum != null) {
			System.out.print(linkedListSum.value);
			linkedListSum = linkedListSum.nextNode;
		}
	}
	
	public static ListNode creatLinkedList() {
		Scanner input = new Scanner(System.in);	
		ListNode cPtr = null;
		ListNode fPtr = null;
		
		System.out.print("Input the LinkedList's length :");
		int length = input.nextInt();
		int value;
		for(int i = 0; i < length; i++) {
			System.out.printf("Input the %d element's value :", i);
		    value = input.nextInt();
			ListNode t;
			if(i == 0) {
				t = new ListNode(value);
				cPtr = t;
				fPtr = t;
			}else{
				t = new ListNode(value);
				cPtr.nextNode = t;
				cPtr = t;
			}
		}
	    return fPtr;
	}
	
	public static ListNode twoListAdd(ListNode list1, ListNode list2) {
		Scanner input = new Scanner(System.in);	
		ListNode listSum = null;
		
		int count = 0;
		ListNode cPtr = null;
		ListNode fPtr = null;
		while((list1.nextNode != null) && (list2.nextNode != null)) {
			if(count == 0) {
				listSum = new ListNode(list1.value + list2.value);
				cPtr = listSum;
				fPtr = listSum;
			}else {
				listSum = new ListNode(list1.value + list2.value);
				cPtr.nextNode = listSum;
				cPtr = listSum;
			}
			count++;
		}
		return fPtr;
	}
}