适配器模式的应用

1.适配源类：java.util.Properties

2.适配目标类：FileIO

3.适配器 FileProperties

package fileio;

import java.io.IOException;

public interface FileIO {
    public void readFromFile(String fileName) throws IOException;
    
    public void writeToFile(String fileName) throws IOException;
    
    public void setValue(String key , String value);
    
    public String getValue(String key);
}

package fileio;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;

public class FileProperties implements FileIO {
    
    
    private Properties p;
    
    public FileProperties(Properties p) {
        this.p = p;
    }
    
    @Override
    public void readFromFile(String fileName) throws IOException {
        p.load(new FileInputStream(new File(fileName)));
    }

    @Override
    public void writeToFile(String fileName) throws IOException {
        p.store(new FileOutputStream(new File(fileName)), "");
    }

    @Override
    public void setValue(String key, String value) {
        p.setProperty(key, value);
    }

    @Override
    public String getValue(String key) {
        return p.getProperty(key);
    }

}

package fileio;

import java.io.IOException;
import java.util.Properties;

public class Client {
    public static void main(String[] args) {
        FileIO fi = new FileProperties(new Properties());
        try {
            fi.readFromFile("test.txt");
            fi.setValue("name", "tisa");
            fi.setValue("age", "12");
            fi.setValue("school", "CCNU");
            
            fi.writeToFile("out.txt");
        } catch (IOException e) {
            e.printStackTrace();
        }
        
    }
}