I am getting output -294967296

So in leetcode 4 sum there is a test case [1000000000,1000000000,1000000000,1000000000] and for some reason the addition of these is equal to -294967296 and i do not understand how exactly this works i assumed it was because the actual answer is larger than max val of an int but i tried that and it just threw an error instead so why does that not happen here

class Solution {
    public List<List<Integer>> fourSum(int[] nums, int target) {
        if(target>Integer.MAX_VALUE||target<Integer.MIN_VALUE){
            return new ArrayList();
        }
        int lb =0;
        int ub  = nums.length-1;
        int sum = 0;
        HashSet<List<Integer>> ans = new HashSet();
        Arrays.sort(nums);
        for(int i = 0;i<nums.length;i++){
        <span class="hljs-keyword">for</span>(<span class="hljs-type">int</span> <span class="hljs-variable">j</span> <span class="hljs-operator">=</span> i+<span class="hljs-number">1</span>;j&lt;nums.length;j++){
            lb = j+<span class="hljs-number">1</span>;
            ub = nums.length-<span class="hljs-number">1</span>;
            <span class="hljs-keyword">while</span>(lb&lt;ub){

                sum = nums[i]+nums[j]+nums[lb]+nums[ub];
                <span class="hljs-keyword">if</span>(sum==-<span class="hljs-number">294967296</span>){
                    System.out.println(sum);
                    System.out.println(nums[i]);
                    System.out.println(nums[j]);
                    System.out.println(nums[lb]);
                    System.out.println(nums[ub]);
                }
                <span class="hljs-keyword">if</span>(sum==target){
                    ans.add(Arrays.asList(nums[i],nums[j],nums[lb],nums[ub]));
                    lb++;
                    ub--;
                }<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span>(sum&lt;target){
                    lb++;
                }<span class="hljs-keyword">else</span>{
                    ub--;
                }

            }
        }
    }
    List&lt;List&lt;Integer&gt;&gt; ret = <span class="hljs-keyword">new</span> <span class="hljs-title class_">ArrayList</span>(ans);
    <span class="hljs-keyword">return</span> ret;
}

}

this is the code i wrote and i dont think there is an issue here