private void encode(String s) { StringBuilder outchar = new StringBuilder(); for(int i=0;i<s.length();i++) { int unicode = s.charAt(i); int thirdchar = (unicode>>8) & 0xFF; outchar.append((char)thirdchar); } s = outchar.toString(); }

这段代码是一个encode方法，它的作用是将一个字符串s进行编码。具体来说，它将字符串s中每个字符的unicode值右移8位，并截取后8位，最终将这个值转换成一个char类型的字符，存储在一个StringBuilder对象中。最后，它将StringBuilder对象转换成一个新的字符串s，并将其覆盖原来的s。需要注意的是，这个方法没有返回值，因为它直接修改了传入的字符串s。

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public void buttonPressed() { String str = input.getText(); encode(str); } private void encode(String s) { StringBuilder outchar = new StringBuilder(); for(int i=0;i<s.length();i++) { int unicode = s.charAt(i); int thirdchar = (unicode>>8) & 0xFF; outchar.append((char)thirdchar); } input.setText(outchar.toString()); }

这段代码是一个Java程序，主要实现的功能是将输入的字符串进行编码，然后将编码后的结果显示在输入框中。具体实现方式是在按钮点击事件中获取输入框中的字符串，然后调用encode()方法进行编码处理。在encode()方法中，使用StringBuilder对象存储编码后的结果，遍历输入的字符串，将每个字符的Unicode码进行处理得到一个长度为2的字节数组，再将这个字节数组的高8位截取出来转换为字符，最后将所有字符拼接成字符串后再显示在输入框中。

import java.util.*; class HuffmanNode implements Comparable<HuffmanNode> { int frequency; char data; HuffmanNode left, right; public HuffmanNode(int frequency, char data) { this.frequency = frequency; this.data = data; } public boolean isLeaf() { return left == null && right == null; } @Override public int compareTo(HuffmanNode node) { return frequency - node.frequency; } } public class HuffmanCoding { public static void main(String[] args) { String text = "Hello, world!"; Map<Character, Integer> frequencyMap = buildFrequencyMap(text); HuffmanNode root = buildHuffmanTree(frequencyMap); Map<Character, String> huffmanCodes = buildHuffmanCodes(root); System.out.println("Original text: " + text); System.out.println("Huffman codes: " + huffmanCodes); System.out.println("Encoded text: " + encode(text, huffmanCodes)); System.out.println("Decoded text: " + decode(encode(text, huffmanCodes), root)); } private static Map<Character, Integer> buildFrequencyMap(String text) { Map<Character, Integer> frequencyMap = new HashMap<>(); for (char c : text.toCharArray()) { frequencyMap.put(c, frequencyMap.getOrDefault(c, 0) + 1); } return frequencyMap; } private static HuffmanNode buildHuffmanTree(Map<Character, Integer> frequencyMap) { PriorityQueue<HuffmanNode> priorityQueue = new PriorityQueue<>(); for (Map.Entry<Character, Integer> entry : frequencyMap.entrySet()) { priorityQueue.offer(new HuffmanNode(entry.getValue(), entry.getKey())); } while (priorityQueue.size() > 1) { HuffmanNode left = priorityQueue.poll(); HuffmanNode right = priorityQueue.poll(); HuffmanNode parent = new HuffmanNode(left.frequency + right.frequency, '-'); parent.left = left; parent.right = right; priorityQueue.offer(parent); } return priorityQueue.poll(); } private static Map<Character, String> buildHuffmanCodes(HuffmanNode root) { Map<Character, String> huffmanCodes = new HashMap<>(); buildHuffmanCodesHelper(root, "", huffmanCodes); return huffmanCodes; } private static void buildHuffmanCodesHelper(HuffmanNode node, String code, Map<Character, String> huffmanCodes) { if (node.isLeaf()) { huffmanCodes.put(node.data, code); return; } buildHuffmanCodesHelper(node.left, code + "0", huffmanCodes); buildHuffmanCodesHelper(node.right, code + "1", huffmanCodes); } private static String encode(String text, Map<Character, String> huffmanCodes) { StringBuilder encodedText = new StringBuilder(); for (char c : text.toCharArray()) { encodedText.append(huffmanCodes.get(c)); } return encodedText.toString(); } private static String decode(String encodedText, HuffmanNode root) { StringBuilder decodedText = new StringBuilder(); HuffmanNode current = root; for (char c : encodedText.toCharArray()) { 后面代码请补充完整

接下来的代码是对编码文本进行解码的部分，请继续阅读：

for (char c : encodedText.toCharArray()) {
    if (c == '0') {
        current = current.left;
    } else if (c == '1') {
        current = current.right;
    }

    if (current.isLeaf()) {
        decodedText.append(current.data);
        current = root;
    }
}

return decodedText.toString();

这段代码使用了当前字符的编码（0或1）来遍历Huffman树。如果遇到叶子节点，就将对应的字符添加到解码文本中，并将当前节点重新设置为根节点，以便继续解码下一个字符。最后返回解码后的文本。

希望这段代码能帮助到您！如果您有任何其他问题，请随时问我。