一个英汉字典例,某书课后题

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;


public class DictDemo {
    public static void main(String[] args) {
        new DictFrame();
    }

}
class DictFrame extends JFrame implements ActionListener{
    JTextField text1,text2;
    JButton bt;
    DictFrame(){
        setTitle("Dict");
        setSize(300,300);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        bt = new JButton("翻 译");
        bt.addActionListener(this);
        text1 = new JTextField(10);
        text2 = new JTextField(10);
        text2.setEditable(false);
        
        add(text1,BorderLayout.WEST);
        add(text2,BorderLayout.EAST);
        add(bt,BorderLayout.SOUTH);
        
        pack();
        this.setLocationRelativeTo(null);
        this.setVisible(true);
        
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        text2.setText(Dicts.getMean(text1.getText().trim().toLowerCase()));
        
    }
}
class Dicts {
    static int id ;
    static String[][] dict ;
    static {
        dict = new String[100][2];
        id = 0;
        insertWord("china","中国");
        insertWord("jpanese","日本");
        insertWord("你好","hello");
    }
    private Dicts(){
        
    }
    public static void insertWord(String str1,String str2){
        dict[id][0] = str1.toLowerCase();
        dict[id][1] = str2.toLowerCase();
        id++;
    }
    public static String getMean(String  str){
        for(int i=0;i<id;i++) {
            if (dict[i][0].equals(str)) return dict[i][1];
            if (dict[i][1].equals(str)) return dict[i][0];
        }
        return "查无此字";
    }
}