What are the commonly used collection framework tools in Java function libraries?

Commonly used Java collection framework tools include List (sequential elements), Set (unique elements), Map (key-value pairs) and Queue (FIFO/LIFO). Example: You can convert a string array to a List and print it. For example, convert {"Alice", "Bob", "Carol", "Dave"} to [Alice, Bob, Carol, Dave] and print it.

Commonly used collection framework tools in Java function library

The Java collection framework provides rich interfaces and specific implementations for storing and operating data collections. Some common collection framework tools are listed below:

List

• Allow duplicate elements
• Maintain element insertion order
• Commonly used implementations: ArrayList, LinkedList

Set

• Duplicate elements are not allowed
• Commonly used implementations: HashSet, TreeSet

##Map

Storage The key-value pair
• has a unique key, and the value can be repeated
• Commonly used implementations:
• HashMap, TreeMap

Queue

• FIFO (first in, first out): The earliest inserted element is taken out first
• LIFO (last in, first out) : The most recently inserted element is taken out first
Commonly used implementations:
• ArrayDeque, LinkedList

Practical cases

Convert string array to List and print

// 创建一个字符串数组
String[] names = {"Alice", "Bob", "Carol", "Dave"};

// 将数组转换为 ArrayList
List<String> namesList = Arrays.asList(names);

// 打印 List 中的元素
for (String name : namesList) {
    System.out.println(name);
}

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