Java Set Get All Not Contain

In Java, there are several ways to get all the values in a set that do not contain a certain value. This can be useful when working with large sets of data and you need to quickly filter out certain values.

Here are some ways to achieve this:

Method 1: remove() and retainAll()

One way to get all the values in a set that do not contain a certain value is to use the remove() method to remove the value from the set, and then use the retainAll() method to remove all other values. Here's an example:

Set<String> set = new HashSet<String>();
set.add("apple");
set.add("banana");
set.add("orange");

set.remove("banana");
set.retainAll(Collections.singleton(""));

System.out.println(set); // Output: [banana]

In this example, we first create a set with three values: "apple", "banana", and "orange". We then remove "banana" from the set using the remove() method. Finally, we use the retainAll() method with a Collections.singleton() call to remove all other values from the set, leaving only "banana".

Method 2: removeAll() and addAll()

Another way to get all the values in a set that do not contain a certain value is to use the removeAll() method to remove the value from the set, and then use the addAll() method to add all the other values back to the set. Here's an example:

Set<String> set = new HashSet<String>();
set.add("apple");
set.add("banana");
set.add("orange");

set.removeAll(Collections.singleton("banana"));
set.addAll(set);

System.out.println(set); // Output: [apple, orange]

In this example, we first create a set with three values: "apple", "banana", and "orange". We then use the removeAll() method with a Collections.singleton() call to remove "banana" from the set. Finally, we use the addAll() method to add all the other values back to the set, leaving only "apple" and "orange".

Method 3: stream() and filter()

If you are using Java 8 or later, you can use the stream() method to get a stream of the values in the set, and then use the filter() method to filter out the values that contain the specified value. Here's an example:

Set<String> set = new HashSet<String>();
set.add("apple");
set.add("banana");
set.add("orange");

Set<String> filteredSet = set.stream().filter(s -> !s.equals("banana")).collect(Collectors.toSet());

System.out.println(filteredSet); // Output: [apple, orange]

In this example, we first create a set with three values: "apple", "banana", and "orange". We then use the stream() method to get a stream of the values in the set, and the filter() method with a lambda expression to filter out "banana". Finally, we use the collect() method to collect the filtered values into a new set, leaving only "apple" and "orange".

These are just a few examples of how to get all the values in a set that do not contain a certain value in Java. Depending on your specific use case, one of these methods may be more suitable than the others.