java将文本内容读入到List中

package parsing.MFC;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;

public class UArrayLst extends ArrayList<String> {

/**
*
*/
private String charset = "UTF-8";

private static final long serialVersionUID = -5784078908561138378L;

public void readfile(String filename, String charset) throws IOException {
FileInputStream fr = new FileInputStream(filename);
if (charset.length() > 0) {
this.charset = charset;
}
InputStreamReader isr = new InputStreamReader(fr, this.charset);

BufferedReader bfr = new BufferedReader(isr);
String subline = bfr.readLine();
while (subline != null) {
this.add(subline);
subline = bfr.readLine();
}
bfr.close();
isr.close();
fr.close();
}

public void writefile(String filename) throws IOException {
FileOutputStream fw = new FileOutputStream(filename);
OutputStreamWriter osw = null;
if (charset.length() > 0) {
osw = new OutputStreamWriter(fw, charset);
} else {
osw = new OutputStreamWriter(fw);
}
BufferedWriter bfw = new BufferedWriter(osw);
for (int ii = 0; ii < this.size(); ii++) {
bfw.write((String) this.get(ii) + "\r\n");
// bfw.newLine();
}
bfw.close();
osw.close();
fw.close();
}
}