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Externalizable接口繼承了Serializable接口，用來(lái)在序列化時(shí)手動(dòng)的把需要的對象信息進(jìn)行序列化。
Externalizable接口提供了兩個(gè)方法：writeExternal(ObjectOuput out) 和 readExternal(ObjectInput in)
在你需要被序列化的類(lèi)中實(shí)現這兩個(gè)方法，這樣在此類(lèi)序列化時(shí)這兩個(gè)方法將被自動(dòng)執行，用以可定制地序列化此類(lèi)。舉例如下：
假如你需要序列化一個(gè)類(lèi)Test：
import java.io.*;

class Test implements Externalizable{  //Test類(lèi)必須實(shí)現Externalizable接口
 private String letterstates = "fanruijun";
 private int num  = 0;
 public Test(){
 }
 
 public void writeExternal(ObjectOutput out) throws IOException {
              out.writeObject(letterstates);
              out.write(88); //在序列化的數據最后加個(gè)88
 }

 public void readExternal(ObjectInput in) throws IOException,
    ClassNotFoundException {
                letterstates = (String)in.readObject();
                num = in.read();  //把數字88加進(jìn)來(lái)
 }
 public void putOut(){ //測試
   System.out.println(letterstates +num);
 }
}


序列化上面的Test類(lèi)：AppTest

import java.io.*;

public class AppTest {

        private void saveGame(){
                Test m = new Test();
                if (m != null){
                        try{
                                FileOutputStream ostream = new FileOutputStream("t.txt");
                                ObjectOutputStream p = new ObjectOutputStream(ostream);

                                p.writeObject(m); //writeExternal()自動(dòng)執行

                                p.flush();
                                ostream.close();
                        } catch (IOException ioe) {
                                System.out.println ("Error saving file:");
                                System.out.println (ioe.getMessage());
                        }
                }
        }

        private void loadGame(){
                try{
                        FileInputStream instream = new FileInputStream("t.txt");
                        ObjectInputStream p = new ObjectInputStream(instream);
                        Test m = (Test)p.readObject();//readExternal()自動(dòng)執行
               
   m.putOut();
                        instream.close();
                } catch (Exception e) {
                        System.out.println ("Error loading file:");
                        System.out.println (e.getMessage());
  }
        }

 public static void main(String[] args){
  new AppTest().saveGame();
  new AppTest().loadGame();
 }
}

運行結果：
D:\test\basic>javac AppTest.java

D:\test\basic>javac Test.java

D:\test\basic>java AppTest
fanruijun88