java中exception的printStackTrace()輸出內容轉成字符串

ArrayList list = new ArrayList();
try {
System.out.println(list.get(1));
} catch (Exception e) {
e.printStackTrace();
System.out.println("=========================");
StringWriter sw = new StringWriter();     PrintWriter pw = new PrintWriter(sw);     e.printStackTrace(pw);     String msg=sw.toString();   System.out.println(msg); }
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