用java写一个具有以下功能的代码: (1)I:初始化(Initialization)。从终端读入字符集大小n,以及n个字符和m个权值,建立哈夫曼树,并将它存于文件hfmTree中。 (2)E:编码(Encoding)。利用以建好的哈夫曼树(如不在内存,则从文件hfmTree中读入),对文件ToBeTran中的正文进行编码,然后将结果存入文件CodeFile中。 (3)D:译码(Decoding)。利用已建好的哈夫曼树将文件CodeFile中的代码进行译码,结果存入文件TextFile中。
时间: 2023-02-06 20:54:19 浏览: 304
你可以使用 Java 来实现哈夫曼树的编码和解码功能。下面是一个示例代码:
1. 初始化(Initialization)
```
import java.util.*;
public class HuffmanTree {
private static class Node implements Comparable<Node> {
char ch;
int freq;
Node left;
Node right;
Node(char ch, int freq) {
this.ch = ch;
this.freq = freq;
left = right = null;
}
Node(char ch, int freq, Node left, Node right) {
this.ch = ch;
this.freq = freq;
this.left = left;
this.right = right;
}
@Override
public int compareTo(Node o) {
return this.freq - o.freq;
}
}
static Map<Character, String> huffmanCodes = new HashMap<>();
static StringBuilder sb = new StringBuilder();
// 构建哈夫曼树
public static Node buildHuffmanTree(int[] charFreqs) {
PriorityQueue<Node> heap = new PriorityQueue<>();
for (int i = 0; i < charFreqs.length; i++) {
if (charFreqs[i] > 0) {
heap.offer(new Node((char) i, charFreqs[i]));
}
}
while (heap.size() > 1) {
Node left = heap.poll();
Node right = heap.poll();
heap.offer(new Node('\0', left.freq + right.freq, left, right));
}
return heap.poll();
}
// 生成哈夫曼编码表
public static void generateHuffmanCodes(Node root, StringBuilder sb) {
if (root == null) {
return;
}
if (root.ch != '\0') {
huffmanCodes.put(root.ch, sb.toString());
} else {
generateHuffmanCodes(root.left, sb.append('0'));
sb.deleteCharAt(sb.length() - 1);
generateHuffmanCodes(root.right, sb.append('1'));
sb.deleteCharAt(sb.length() - 1);
}
}
// 从终端读入字符集大小n,以及n个字符和m个权值,建立哈夫曼树
public static Node init() {
Scanner scan = new Scanner(System.in);
System.out.println("请
阅读全文
相关推荐
![-](https://img-home.csdnimg.cn/images/20241231044955.png)
![-](https://img-home.csdnimg.cn/images/20241231044930.png)
![-](https://img-home.csdnimg.cn/images/20241231045053.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![doc](https://img-home.csdnimg.cn/images/20241231044833.png)
![cpp](https://img-home.csdnimg.cn/images/20250102104920.png)
![zip](https://img-home.csdnimg.cn/images/20241231045053.png)
![zip](https://img-home.csdnimg.cn/images/20241231045053.png)
![rar](https://img-home.csdnimg.cn/images/20241231044955.png)
![rar](https://img-home.csdnimg.cn/images/20241231044955.png)
![zip](https://img-home.csdnimg.cn/images/20241231045053.png)
![text/x-c](https://img-home.csdnimg.cn/images/20250102104920.png)
![zip](https://img-home.csdnimg.cn/images/20241231045053.png)
![-](https://img-home.csdnimg.cn/images/20241231045053.png)
![-](https://img-home.csdnimg.cn/images/20241226111658.png)
![-](https://img-home.csdnimg.cn/images/20241226111658.png)