How to get maximum value from the Collection (for example ArrayList)?

Nitty-gritty of maximum value retrieval

Custom comparators: For those who love control

In need of a made-to-order comparison? Go for a Comparator:

ArrayList<MyObject> myObjects = getMyObjects(); //might not contain your favorite object
MyObject maxObject = Collections.max(myObjects, new MyComparator()); 
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Or make it slick with Lambda expression:

MyObject maxObject = Collections.max(myObjects, Comparator.comparing(MyObject::getValue)); //smooth as butter
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Embrace modernity with Stream API

The Stream API aligns with the trend and keeps your code elegant:

OptionalInt maxValue = list.stream().mapToInt(v -> v).max(); 
maxValue.ifPresent(max -> System.out.println("Stream Max: " + max)); // prints only if present, else stays quiet.
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OptionalInt takes care of the empty streams like a charm.

Edge cases and performance: They matter too!

Working with a big data? Understand your requirements:

• A direct loop might be faster but verbose.
• Streams offer superior readability but come at a cost (They aren't high maintanence though 😄).

No elements? No problems!

Working with empty collections? Here's a preventive check:

if (!collection.isEmpty()) { //It's not about the quantity, it's about the quality!
    int max = Collections.max(collection);
}
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When you need creativity over Collections.max()

Hang on! Collections.max() doesn't give you all?

• Have a custom loop for your specific needs.
• Use Streams when you seek concise and creative max extraction.

Complementary min retrieval, just because we're awesome!

As a bonus, here's how you find minimum:

int min = Collections.min(Arrays.asList(1, 2, 3));  //Because opposites attract!
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