java怎样把一字符串数组写入.txt文件中？

import java.io.File\x0d\x0aimport java.io.OutputStream\x0d\x0aimport java.io.FileOutputStream\x0d\x0apublic class TestFile {\x0d\x0apublic static void main(String[] args) throws Exception{\x0d\x0a//在d盘上创建一个名为testfile的文本文件\x0d\x0aFile f = new File("D:"+File.separator+"testfile.txt")\x0d\x0a//用FileOutputSteam包装文件，并设置文件可追加\x0d\x0aOutputStream out = new FileOutputStream(f,true)\x0d\x0a//字符数组\x0d\x0aString[] str = {"shanghai","beijing","guangdong","xiamen"}\x0d\x0afor(int i =0i

String s = "akjibuvuvu"

FileWriter fw = null

File f = new File("a.txt")

try {

if(!f.exists()){

f.createNewFile()

}

fw = new FileWriter(f)

BufferedWriter out = new BufferedWriter(fw)

out.write(s, 0, s.length()-1)

out.close()

} catch (IOException e) {

e.printStackTrace()

}

System.out.println("end")

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