# Java - `StackTrace`到`String`的轉換 > 原文： [https://beginnersbook.com/2015/05/java-stacktrace-to-string-conversion/](https://beginnersbook.com/2015/05/java-stacktrace-to-string-conversion/) 有時我們想**將發生的異常轉換為`String`**。在下面的程序中，我們使用`Throwable.printStackTrace(PrintWriter pw)`將`stacktrace`轉換為`String`。 ## 示例：將`Exception StackTrace`轉換為`String` ```java package com.beginnersbook.string; import java.io.PrintWriter; import java.io.StringWriter; public class StacktraceToString { ?? ?public static void main(String args[]){ ?? ??? ?try{ ?? ??? ??? ?int i =5/0; ?? ??? ??? ?System.out.println(i); ?? ??? ?}catch(ArithmeticException e){ ?? ??? ??? ?/* This block of code would convert the ?? ??? ??? ? * stacktrace to string by using ?? ??? ??? ? * Throwable.printStackTrace(PrintWriter pw) ?? ??? ??? ? * which sends the stacktrace to the writer ?? ??? ??? ? * that we can convert to string using tostring() ?? ??? ??? ? */ ?? ??? ??? ?StringWriter sw = new StringWriter(); ?? ??? ??? ?PrintWriter pw = new PrintWriter(sw); ?? ??? ??? ?e.printStackTrace(pw); ?? ??? ??? ?String stacktraceString = sw.toString(); ?? ??? ??? ?System.out.println("String is: "+stacktraceString); ?? ??? ?} ?? ?} } ``` **輸出：** ```java String is: java.lang.ArithmeticException: / by zero at com.beginnersbook.string.StacktraceToString.main(StacktraceToString.java:8) ```