Check out example codes for "java how to find the largest number in an arraylist". It will help you in understanding the concepts better.

Code Example 1

List<Integer> myList = new ArrayList<>();

for(int i = 0; i < 10; i++){
    myList.add(i);
}
//gets highest number in the list
int highestNumber = Collections.max(myList);

System.out.Println(highestNumber);

//output: 9

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