已知文本内容1，2，3，4，5，6根据逗号个数截取如果选择3个得到的结果是3privatevoidjButton3ActionPerformed(java.awt.event.ActionEventevt){try{BufferedReaderin=newBufferedRead...

已知文本内容1，2，3，4，5，6

根据逗号个数截取 如果选择3个

得到的结果是3

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {

try {

BufferedReader in=new BufferedReader(new FileReader(name1 +name));

String str=new String();

String s=new String();

while((s=in.readLine())!=null)

str+=s+"\n";

in.close();

System.out.println(str);

PrintWriter out=new PrintWriter(new BufferedWriter(new FileWriter(name3+name2)));

BufferedReader outbfreader=new BufferedReader(new StringReader(str));

while((s=outbfreader.readLine())!=null)

out.println(s);

String[] str1 = s.split(",");

System.out.println(str1[2]);

out.close();

}

catch (Exception e) {

System.out.println("违う");

e.printStackTrace();

}

}

这个为什么产生错误呢

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