class WordPolice implements ActionListener { WindowWord view; HashMap<String,String>hashtable; File file = new File ("E:\\JAVA\\上机\\作业5\\cet4.txt"); Scanner sc = null ; WordPolice () { hashtable = new HashMap< String,String >(); //System.out.println(hashtable.size()); try { sc = new Scanner ( file ); //System.out.println(sc); while (sc.hasNext ()) { String englishWord = sc . next (); String chineseWord = sc . next (); hashtable . put ( englishWord , chineseWord ); } } catch(Exception e ) {} } public void setView(WindowWord view) { this.view = view; } public void actionPerformed(ActionEvent e) { String englishWord = view.inputText.getText (); if(hashtable.containsKey(englishWord)) { String chineseWord = hashtable.get ( englishWord ); view.showText.setText ( chineseWord ); } else { view.showText.setText ("没有此单词"); } } }把这段代码完善一下，让它能实现汉语翻译为英语

可以在原有的 WordPolice 类中新增一个方法，用于将HashMap中的键值对反转，即将汉语作为键，英语作为值。同时，在 actionPerformed 方法中加入判断，如果输入的是中文，则调用新加的方法进行翻译。

完整代码如下：

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.util.HashMap;
import java.util.Scanner;

public class WordPolice implements ActionListener {
    WindowWord view;
    HashMap<String,String> hashtable;
    File file = new File("cet4.txt");
    Scanner sc = null;

    WordPolice () {
        hashtable = new HashMap<String,String>();
        try {
            sc = new Scanner(file);
            while (sc.hasNext()) {
                String englishWord = sc.next();
                String chineseWord = sc.next();
                hashtable.put(englishWord, chineseWord);
            }
            // 新增方法，将键值对进行反转
            HashMap<String,String> reversedHashtable = new HashMap<String,String>();
            for (String key : hashtable.keySet()) {
                String value = hashtable.get(key);
                reversedHashtable.put(value, key);
            }
            hashtable.putAll(reversedHashtable);
        } catch(Exception e) {}
    }

    public void setView(WindowWord view) {
        this.view = view;
    }

    public void actionPerformed(ActionEvent e) {
        String inputWord = view.inputText.getText();
        if (hashtable.containsKey(inputWord)) {
            String outputWord = hashtable.get(inputWord);
            view.showText.setText(outputWord);
        } else {
            // 新增判断，如果输入的是中文，则进行翻译
            String chineseWord = inputWord;
            for (String key : hashtable.keySet()) {
                String value = hashtable.get(key);
                if (value.equals(chineseWord)) {
                    view.showText.setText(key);
                    return;
                }
            }
            view.showText.setText("没有此单词");
        }
    }
}

需要注意的是，此代码只能进行简单的单词翻译，无法处理词组、句子等复杂情况。