如何将一个arraylist里的数据倒入到一个文件？

Question

建一个流，从0开始到arraylist的长度做循环，取出每个内容，用流写入文件。

Answer 1

File myFilePath = new File(filePath);
if (!myFilePath.exists())
    myFilePath.createNewFile();
java.io.FileWriter fw=new java.io.FileWriter(filePath,false);
java.io.PrintWriter pw=new java.io.PrintWriter(fw);
for (int i=0;i<myArrayList.size();i++)
{
    pw.println(myArrayList.get(i));}

Answer 2

Iterator i = arraylist.iteraotor();
FileOutputStream file = new FileOutputStream("xx.txt");
  ObjectOutputstream out = new ObjectOutputStream(file); while(i.hasNext)
  out.writeObject(i.next());

Answer 3

public void writeToFile(String[][] records, String fileName)
        throws IOException {
        boolean hasPreviousColumn = false;
        OutputStream os = new FileOutputStream(fileName);
        Writer wt = new BufferedWriter(new OutputStreamWriter(os));        if (records != null) {
            synchronized (new Object()) {
                for (int i = 0; i < records.length; i++) {
                    for (int j = 0; j < records[i].length; j++) {
                        String temp = records[i][j];
                        if (hasPreviousColumn) {
                            wt.write(COLUMN_SEPA);
                        }                        if (temp == null) {
                            temp = "";
                        }                        wt.write(temp);
                        hasPreviousColumn = true;
                    }
                    if (i != records.length -1) {
                        wt.write(lineSepa);
                    }
                    hasPreviousColumn = false;
                    wt.flush();
                }
            }
        }
    }