我无法打开项目的jar文件

Question

我有一个项目，我需要有它的jar文件，但它没有打开，任何人都可以帮助我，我需要尽快为我的大学。以下是整个代码：

package huffmanproject;

import java.util.ArrayList;
import java.util.PriorityQueue;

public class huffmanproject {

    public static class HuffNode implements Comparable<HuffNode> {

        public int value;
        public int weight;
        public HuffNode leftTree;
        public HuffNode rightTree;
        public HuffNode parent;

        public HuffNode() {
            parent = null;
        }

        public HuffNode( int v, int w, HuffNode lTree, HuffNode rTree, HuffNode par ) {
            value = v;
            weight = w;
            leftTree = lTree;
            rightTree = rTree;
            parent = par;
         }

        @Override
        public int compareTo(HuffNode rhs) {
            return weight - rhs.weight;
        }

        @Override
        public String toString() {
            String str = "";
            str += this.value;
            return str;
        }
    }

    public static class HuffTree {

        private int size = 0;
        private HuffNode root = new HuffNode();
        private PriorityQueue<HuffNode> huffQueue = new PriorityQueue();
        public ArrayList<String> pathTable = new ArrayList();
        public ArrayList<Character> valueTable = new ArrayList();

        public HuffTree(int[] freq, char[] code) {

            this.size = freq.length;

            if (freq.length != code.length) {
            throw new UnsupportedOperationException("Error: Character and code length mismatch.");
            }

            for (int i = 0; i < this.size; i++) {
                huffQueue.offer(new HuffNode(code[i], freq[i], null, null, null));
            }
            createTree();
            createTable(this.root, "");
        }

        private void createTree() {
            while (huffQueue.size() > 1) {
                HuffNode tempL = huffQueue.poll();
                HuffNode tempR = huffQueue.poll();
                HuffNode parent = new HuffNode(0, tempL.weight+tempR.weight, tempL, tempR, null);
                tempL.parent = parent;
                tempR.parent = parent;
                huffQueue.offer(parent);
                this.size++;
            }
            this.root = huffQueue.peek();
        }
        private void createTable(HuffNode curr, String str) {
            if (curr == null) return;
            if (curr.leftTree == null && curr.rightTree == null) {
                char tempChar;
                if (curr.value == 32)
                    tempChar = ' ';

                if (curr.value == 10)
                    tempChar = 'n';

                else 
                    tempChar = (char)curr.value;
                this.valueTable.add(tempChar);
                this.pathTable.add(str);
            }
            str += "0";
            createTable(curr.leftTree, str);
            str = str.substring(0, str.length()-1);
            str += "1";
            createTable(curr.rightTree, str);
        }
        String tacks = "";
        public void getTree(HuffNode curr) {
            if (curr == null) return;
            if (curr.leftTree == null && curr.rightTree == null) {
                switch (curr.value) {
                    case 32:
                        System.out.println(tacks + curr.weight + ": sp");
                        break;
                    case 10:
                        System.out.println(tacks + curr.weight + ": nl");
                        break;
                    default:
                        System.out.println(tacks + curr.weight + ": " + (char)curr.value);
                        break;
                }              
            }
            else
                System.out.println(tacks + curr.weight);
            tacks += "- ";
            getTree(curr.leftTree);
            getTree(curr.rightTree);
            tacks = tacks.substring(0, tacks.length()-2);
        }
        public int getSize() { return this.size; }
        public String encode(String input){
            String str = "";
            for (int x = 0; x < input.length(); x++) {
                for (int i = 0; i < valueTable.size(); i++) {
                    if (valueTable.get(i) == input.charAt(x))
                        str += pathTable.get(i);
                }
            }
            return str;
        }
        public String decode(String bits) {
            String decodedStr = "";
            for (int i = 0; i < bits.length(); i++) {
                if (!getChar(bits.substring(0, i+1)).equals("")) {
                    decodedStr += getChar(bits.substring(0, i+1));
                    bits = bits.substring(i+1);
                    i = 0;
                }
            }
            return decodedStr;
        }
        private String getChar(String bits) {
            String character = "";
                for (int i = 0; i < pathTable.size(); i++) {
                    if (pathTable.get(i).equals(bits))
                        character = valueTable.get(i).toString();
                }
            return character;
        }
    }
        public static void main(String[] args) {
            // for example assume that we have these letters with these different frequencies like below:
            int freq[] = {10, 15, 12, 3, 4, 13, 1};
            char code[] = {'a', 'e', 'i', 's', 't', ' ', '\n'};
            HuffTree hTree = new HuffTree(freq, code);
            System.out.println("Display Tree:");
            HuffNode curr = hTree.root;
            hTree.getTree(curr);
            System.out.println("");
            // and we want to build the huffman tree of the word sea :
            System.out.println("Encode 'sea': " + hTree.encode("sea") +"\n");
            System.out.println("Decode '" + hTree.encode("sea") + "': " +                                           hTree.decode(hTree.encode("tea")));
        }
}

Answer 1

如果它只是没有编译成jar文件，请在命令提示符或终端中尝试以下命令。

jar cf jar-file input-file(s)

来自Oracle：Creating jar File

要打开命令提示符，请使用WIN + R打开运行框，键入cmd，然后按Enter键。

导航到java文件的目录：

cd C:\Path\to\my\java\file\HuffNode.java

运行命令：

jar cf HuffNode.jar HuffNode.java

如果您有多个.java文件：

jar cf HuffNode.jar File1.java File2.java File3.java