结构型模式：08-桥接模式

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package com.zhs.design.bridge.demo2.db;

public interface DataBase {
    String output(String fileName);
}
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public class MySqlDB implements DataBase {
    @Override
    public String output(String fileName) {
        return "MySqlDB:"+fileName;
    }
}
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public class OracleDB implements DataBase {
    @Override
    public String output(String fileName) {
        return "OracleDB:"+fileName;
    }
}
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public class PostgreDB implements DataBase {
    @Override
    public String output(String fileName) {
        return "PostgreDB:"+fileName;
    }
}

import com.zhs.design.bridge.demo2.db.DataBase;

public abstract class AbstractFileTool {
    protected DataBase dataBase;

    public AbstractFileTool(DataBase dataBase) {
        this.dataBase = dataBase;
    }

    public abstract String parseFile(String fileName);
}
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public class PdfTool extends AbstractFileTool {
    public PdfTool(DataBase dataBase) {
        super(dataBase);
    }

    @Override
    public String parseFile(String fileName) {
        return dataBase.output(fileName)+".pdf";
    }
}
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public class TxtTool extends AbstractFileTool {
    public TxtTool(DataBase dataBase) {
        super(dataBase);
    }

    @Override
    public String parseFile(String fileName) {
        return dataBase.output(fileName)+".txt";
    }
}
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public class XmlTool extends AbstractFileTool {
    public XmlTool(DataBase dataBase) {
        super(dataBase);
    }

    @Override
    public String parseFile(String fileName) {
        return dataBase.output(fileName)+".xml";
    }
}

public class Main {
    public static void main(String[] args) {
        PdfTool tool = new PdfTool(new MySqlDB());
        String s = tool.parseFile("人员");
        System.out.println(s);
    }
}