scorecomparator.java

来自「j2me源代码」· Java 代码 · 共 47 行

package snake;

import javax.microedition.rms.RecordComparator;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;


class ScoreComparator
    implements RecordComparator {
  public int compare(byte[] record1, byte[] record2) {
    short score1 =0, score2 =0;
    ByteArrayInputStream bIn;
    DataInputStream dIn;
    //得到score1;
    bIn = new ByteArrayInputStream(record1);
    dIn = new DataInputStream(bIn);
    try {
      score1 = dIn.readShort();
      bIn.close();
      dIn.close();
    }
    catch (IOException ex) {
    }

    //得到score2;
    bIn = new ByteArrayInputStream(record2);
    dIn = new DataInputStream(bIn);
    try {
      score2 = dIn.readShort();
      bIn.close();
      dIn.close();
    }
    catch (IOException ex1) {
    }

    //比较大小
    if (score1 < score2) {  //大于
      return RecordComparator.FOLLOWS;
    }
    if (score1 > score2) {  //小于
      return RecordComparator.PRECEDES;
    }
    return RecordComparator.EQUIVALENT;  //想等
  }
}