top10recordstore.java~4~

j2me源代码

package snake;

import java.util.Vector;
import javax.microedition.rms.RecordStore;
import javax.microedition.rms.RecordStoreNotFoundException;
import javax.microedition.rms.RecordEnumeration;
import javax.microedition.rms.RecordComparator;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;

class Top10RecordStore {
  public Top10RecordStore() {
  }

  public void saveTop10(Vector vector, String s) {
    try {
      try {
        RecordStore.deleteRecordStore(s);
      }
      catch (RecordStoreNotFoundException recordstorenotfoundexception) {}
      RecordStore recordstore = RecordStore.openRecordStore(s, true);
      
      ByteArrayOutputStream bOut;
      DataOutputStream dOut;

      for (int i = 0; i < vector.size(); i++) {
        Record r = (Record) vector.elementAt(i);
        byte[] data;
        bOut = new ByteArrayOutputStream();
        dOut = new DataOutputStream(bOut);
        dOut.writeShort(r.nScore);
        dOut.writeUTF(r.name);
        data = bOut.toByteArray();
        recordstore.addRecord(data, 0, data.length);
      }

      recordstore.closeRecordStore();
    }
    catch (Exception exception) {}
  }

  public Vector loadTop10(String s) {
    Vector vector = new Vector();
    try {
      RecordStore recordstore = RecordStore.openRecordStore(s, false);
      RecordEnumeration recordenumeration = null;

      recordenumeration = recordstore.enumerateRecords(null,
          new ScoreComparator(), false); //排顺序；

      ByteArrayInputStream bIn;
      DataInputStream dIn;
      
      while (recordenumeration.hasNextElement()) {
        byte data[];
        data = recordenumeration.nextRecord();
        bIn = new ByteArrayInputStream(data);
        dIn = new DataInputStream(bIn);
        
        short score = dIn.readShort();
        String name = dIn.readUTF();
        Record r = new Record(score, name);
        vector.addElement(r);
      }
      //释放资源；
      if (recordenumeration != null) {
        recordenumeration.destroy();
      }
      recordstore.closeRecordStore();
    }
    catch (Exception exception) {}
    return vector;
  }
}