hiscore.java

J2ME的游戏原代码!希望能帮助有需要帮助的师兄弟们！

package com.centerscore.game;

import javax.microedition.rms.*;
import java.util.Vector;
import java.io.*;


class HiScore {
    /* Start	Modified		07-05-2003		for chinese support	*/
    static final int NUM_HISCORES = 5;
    /* End		Modified		07-05-2003	*/

    private String[] m_Arr1Names = new String[NUM_HISCORES];
    private int[] m_Arr1Scores = new int[NUM_HISCORES];
    private static final String FILE_NAME = "QbertScores";


    void writeFile() {
        RecordStore rs = null;

        try {
            rs = RecordStore.openRecordStore(FILE_NAME, false);
            myWriteFile(rs);
        } catch (Exception e) {}
        finally {
            try {
                if (rs != null)
                    rs.closeRecordStore();
            } catch (Exception e) {}
        }
    }


    private void myWriteFile(RecordStore rs) throws IOException, Exception {
        // create a byte stream to output
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        //(10 + 4) * NUM_HISCORES * NUM_CATEGORIES);

        // wrap in something that understands our format
        DataOutputStream dos = new DataOutputStream(baos);

        // copy stuff over
        for (int difficulty = 0; difficulty < 3; difficulty++) {
            for (int scoreIndex = 0; scoreIndex < NUM_HISCORES; scoreIndex++) {
                dos.writeUTF(m_Arr1Names[scoreIndex]);
                dos.writeInt(m_Arr1Scores[scoreIndex]);
            }
        }
        // done copy

        // transfer over to record
        byte[] buf = baos.toByteArray();
        try {
            rs.setRecord(1, buf, 0, buf.length); // records start at 1
        }
        catch (InvalidRecordIDException ire) {
            // add record if it doesn't exist
            rs.addRecord(buf, 0, buf.length);
        }
    }

    // sorted default
    void readFile(String[] arrDefaultNames, int[] arr1DefaultScores) {
        RecordStore rs = null;

        try {
            rs = RecordStore.openRecordStore(FILE_NAME, true);

            // 1) get the records
            // 2) sort record
            // 3) rewrite records

            if (rs.getNumRecords() > 0) {
                byte[] data = rs.getRecord(1);
                DataInputStream dis = new DataInputStream(new ByteArrayInputStream(data));
                for (int difficulty = 0; difficulty < 3; difficulty++) {
                    for (int scoreIndex = 0; scoreIndex < NUM_HISCORES; scoreIndex++) {
                        m_Arr1Names[scoreIndex] = dis.readUTF();
                        m_Arr1Scores[scoreIndex] = dis.readInt();
                    }
                }
            } else {
                //default assignments
                for (int difficulty = 0; difficulty < 3; difficulty++) {
                    for (int scoreIndex = 0; scoreIndex < NUM_HISCORES; scoreIndex++) {
                        m_Arr1Names[scoreIndex] = arrDefaultNames[scoreIndex];
                        m_Arr1Scores[scoreIndex] = arr1DefaultScores[scoreIndex];
                    }
                }
            }
        } catch (Exception e) {}
        finally {
            if (rs != null) {
                try {
                    rs.closeRecordStore();
                } catch (Exception e) {} // ignore.. we're closing out
            }
        }
    }


    final int getIndex(int score) {
        // score in this case is points.. so highest points on top!!

        for (int i = NUM_HISCORES - 1; i >= 0; i--) {
            if (score < m_Arr1Scores[i] || (score == m_Arr1Scores[i])) {
                if (i + 1 >= NUM_HISCORES)
                    return -1;
                return i + 1;
            }
        }
        return 0;
    }


    String getName(int index) {
        if (index < 0 || index >= NUM_HISCORES) {
            return "";
        }
        return m_Arr1Names[index];
    }

    int getScore(int index) {
        if (index < 0 || index >= NUM_HISCORES) {
            return 0;
        }
        return m_Arr1Scores[index];
    }


    int addScore(String name, int points) {

        int i = getIndex(points);

        // if we're higher then the current (point), we want to shove under it
        for (int j = NUM_HISCORES - 1; j > i; j--) {
            m_Arr1Scores[j] = m_Arr1Scores[j - 1];
            m_Arr1Names[j] = m_Arr1Names[j - 1];
        }

		/* Start	Modified		07-05-2003		for chinese support	*/
/*
        String tmp = "";
        int len = name.length();
        for (int k = 0; k < len; k++) {
            char c = name.charAt(k);
            if ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9')) {
                tmp  += c;
            } else {
                tmp += " ";
            }
        }
*/
        m_Arr1Names[i] = name;

		/* End	Modified		07-05-2003	*/
        m_Arr1Scores[i] = points;
        return i;
    }
}