filter.java

应用j2me技术开发的手机游戏

import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;

import javax.microedition.rms.RecordComparator;
import javax.microedition.rms.RecordFilter;

public class filter implements RecordFilter, RecordComparator {

	public boolean matches(byte[] data) {

		DataInputStream da = new DataInputStream(new ByteArrayInputStream(data));

		try {
			System.out.println(da.readUTF());
			int sum = da.readInt();
			if (sum > 30)
				return true;
		} catch (IOException e) {

			e.printStackTrace();
		}

		return false;
	}

	public int compare(byte[] a, byte[] b) {
		DataInputStream da = new DataInputStream(new ByteArrayInputStream(a));
		DataInputStream db = new DataInputStream(new ByteArrayInputStream(b));
		try {
			da.readUTF();
			int numa = da.readInt();
			db.readUTF();
			int numb = db.readInt();
			if(numa==numb)
				return RecordComparator.EQUIVALENT;
			else
				return numa<numb?RecordComparator.FOLLOWS:RecordComparator.PRECEDES;
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return 0;
	}

}