How do I iterate over sets and lists in Java?

How do I iterate over sets and lists in Java?

In Java, you can use a for-each loop to iterate over both sets and lists. For example:

// For a list List<String> list = Arrays.asList("A", "B", "C"); for (String item : list) { System.out.println(item); }

// For a set Set<String> set = new HashSet<>(Arrays.asList("X", "Y", "Z")); for (String item : set) { System.out.println(item); }

What if I want to use an index while iterating over a list?

If you need to use an index, you can use a traditional for loop:

for (int i = 0; i < list.size(); i++) { System.out.println(list.get(i)); } This way, you can access both the index and the element.

Can I use streams to iterate over a list?

Yes, you can use Java Streams for a more functional approach:

list.stream().forEach(item -> System.out.println(item)); This is a concise way to iterate and perform actions on each element.

Are there any performance differences between these methods?

Yes, traditional for loops are generally faster for simple iterations, while streams offer more readability and flexibility, especially for complex operations.