default_capacity

默认容量是指在没有显式指定容量的情况下，一个数据结构或容器所能够存储的元素数量。不同的数据结构或容器有不同的默认容量设置，通常是根据性能和内存占用的平衡进行选择。例如，一个默认容量为10的列表（List）可以存储最多10个元素，而一个默认容量为16的哈希表（Hash Table）可以存储最多16个键值对。在超过默认容量时，数据结构或容器可能需要进行扩容操作来适应更多的元素。

相关问题

UnboundLocalError: local variable 'barrel_capacity' referenced before assignment

This error occurs when a local variable is referenced before it is assigned a value. For example:

def fill_barrel(amount):
    if amount > 0:
        barrel_capacity = 100
        fill_amount = min(barrel_capacity, amount)
        barrel_capacity -= fill_amount
        return fill_amount
    else:
        return 0

print(fill_barrel(50)) # expected output: 50
print(fill_barrel(75)) # expected output: 25

In this code snippet, the `barrel_capacity` variable is assigned a value inside the `if` statement. However, the `fill_amount` variable is assigned a value before `barrel_capacity`, which causes the `UnboundLocalError`. To fix this, we need to assign a value to `barrel_capacity` before we reference it:

def fill_barrel(amount):
    barrel_capacity = 100 # assign a default value
    if amount > 0:
        fill_amount = min(barrel_capacity, amount)
        barrel_capacity -= fill_amount
        return fill_amount
    else:
        return 0

print(fill_barrel(50)) # expected output: 50
print(fill_barrel(75)) # expected output: 25

如下的代码如何输入//Test public method public HashMap(int initialCapacity) { this(initialCapacity, DEFAULT_LOAD_FACTOR); } public HashMap(int initialCapacity, float loadFactor) { if (initialCapacity < 0) throw new IllegalArgumentException("Illegal initial capacity: " + initialCapacity); if (initialCapacity > MAXIMUM_CAPACITY) initialCapacity = MAXIMUM_CAPACITY; if (loadFactor <= 0 || Float.isNaN(loadFactor)) throw new IllegalArgumentException("Illegal load factor: " + loadFactor); this.loadFactor = loadFactor; this.threshold = tableSizeFor(initialCapacity); } exit

你可以使用以下Java代码来读入这段源码：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // 读入源码
        System.out.println("请输入源码：");
        String sourceCode = "";
        String line;
        while (!(line = scanner.nextLine()).equals("exit")) {
            sourceCode += line + "\n";
        }

        // 统计关键字数量
        String[] keywords = {"abstract", "assert", "boolean", "break", "byte", "case", "catch", "char", "class", "const",
            "continue", "default", "do", "double", "else", "enum", "extends", "false", "final", "finally", "float",
            "for", "goto", "if", "implements", "import", "instanceof", "int", "interface", "long", "native", "new",
            "null", "package", "private", "protected", "public", "return", "short", "static", "strictfp", "super",
            "switch", "synchronized", "this", "throw", "throws", "transient", "true", "try", "void", "volatile", "while"};

        int count = 0;
        for (String word : sourceCode.split("\\W+")) {
            if (word.isEmpty()) {
                continue;
            }
            for (String keyword : keywords) {
                if (word.equals(keyword)) {
                    count++;
                    break;
                }
            }
        }

        // 输出关键字数量
        System.out.println("源码中关键字的数量为：" + count);
    }
}

该程序会读入从键盘输入的源码，输入完毕后输入“exit”即可停止输入。程序会统计源码中Java关键字的数量，并输出这个数量。请注意，该程序只是一个简单的演示，实际应用中可能需要更为复杂的处理方式。