DEFAULT_LOAD_FACTOR
时间: 2023-03-24 11:02:35 浏览: 45
DEFAULT_LOAD_FACTOR 是 HashMap 类中的一个常量,表示 HashMap 的默认负载因子,即当 HashMap 中元素数量达到容量的 75% 时,会触发扩容操作。默认负载因子为 .75。
相关问题
unordered_map load_factor
unordered_map的load_factor是指unordered_map中已存储元素的平均数量与桶(bucket)的数量之间的比率。load_factor可以通过unordered_map的max_load_factor()方法来获取。load_factor的值越高,表示unordered_map中的桶被占用得越满,可能会导致查找速度变慢。所以,较低的load_factor可以提高unordered_map的性能。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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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:
```java
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。