package 作业5; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.*; import java.io.File; import java.util.HashMap; import java.util.Scanner; import java.io.File; import java.util.HashMap; import java.util.Scanner; public class Example13_7{ public static void main( String args []){ WindowWord win = new WindowWord(); win.setTitle("英﹣汉小字典"); } } class WindowWord extends JFrame{ JTextField inputText,showText; WordPolice police; public WindowWord(){ setLayout(new FlowLayout()); inputText = new JTextField(6); showText = new JTextField(6); showText.setColumns(15); add(inputText); add(showText); police = new WordPolice(); police.setView(this); inputText.addActionListener(police); setBounds(100,100,400,280); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } } 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 ); } 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 { 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"); } } }把这段代码完善一下，让它能实现汉语翻译为英语，英语也能翻译为汉语，GUI界面不变

完善后的代码如下：

package 作业5; 

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

public class Example13_7{ 	
    public static void main( String args []){
        WindowWord win = new WindowWord(); 
        win.setTitle("英﹣汉小字典"); 
    } 
} 

class WindowWord extends JFrame{ 	
    JTextField inputText,showText; 	
    WordPolice police; 	
    public WindowWord(){ 		
        setLayout(new FlowLayout());  		
        inputText = new JTextField(6);  		
        showText = new JTextField(6);  		
        showText.setColumns(15); 		
        add(inputText); 		
        add(showText); 		
        police = new WordPolice();  		
        police.setView(this); 		
        inputText.addActionListener(police);  		
        setBounds(100,100,400,280); 		
        setVisible(true); 		
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 	
    } 
} 

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>(); 		
        try {   
            sc = new Scanner(file); 			
            while (sc.hasNext()) { 				
                String englishWord = sc.next(); 				
                String chineseWord = sc.next(); 				
                hashtable.put(englishWord, chineseWord); 			
            } 			
            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 { 			
            String chineseWord = inputWord;             
            for (String key : hashtable.keySet()) {                 
                String value = hashtable.get(key);                 
                if (value.equals(chineseWord)) {                     
                    view.showText.setText(key);                     
                    return;                 
                }             
            }             
            for (String value : hashtable.values()) {                 
                if (value.equals(inputWord)) {                     
                    String outputWord = hashtable.get(value);                     
                    view.showText.setText(outputWord);                     
                    return;                 
                }             
            } 			
            view.showText.setText("没有此单词"); 		
        } 	
    } 
}

主要的改动在 `WordPolice` 类中，增加了对汉语翻译为英语的处理。在没有找到对应单词时，先按照输入的汉语查找对应的英语单词，如果找到了，就将其翻译为中文输出；如果还没有找到，就按照输入的英语单词查找对应的汉语，如果找到了，就将其翻译为英文输出。如果还是没有找到，就输出提示信息“没有此单词”。