incompatible types how can i return the two values in java

public static ArrayList<Integer> longestConsecutiveIncreasingSequence(int[] arr) {
        /* Your class should be named Solution
         * Don't write main().
         * Don't read input, it is passed as function argument.
         * Return output and don't print it.
         * Taking input and printing output is handled automatically.
        */
        HashMap<Integer,Boolean>hm=new HashMap<>();
        for(int val :arr){
            hm.put(val,true);}
        for(int val:arr)
        {
           if( hm.containsKey(val-1))
            hm.put(val,false);
        }
        int msp=0;
        int ml=0;
        for (int val:arr) {
            if(hm.get(val)==true){
                int tsp=val;
                int tl=1;

                while(hm.containsKey(tsp+tl)){
                    tl++;}
                if(tl>ml){
                    ml=tl;;
                    msp=tsp; }
                 }
             }
        return (msp);
        return(msp+ml-1);
        
    }

>Solution :

//use this syntax to add value in arraylist and then return list.
ArrayList<Integer> list=new ArrayList<Integer>(); list.add(msp); list.add(msp+ml-1); return list