fillInStackTrace 方法的作用就是一追可以追溯到栈的底部。
转载一个测试类:
<span style="font-family:Microsoft YaHei;font-size:14px;">package com.exception; /** * Created with IntelliJ IDEA. * User: 菜鸟大明 * Date: 14-7-7 * Time: 下午10:42 * To change this template use File | Settings | File Templates. */ class Exception2 { Throwable th = new Throwable();; public Exception2() { System.out.println("in constructor"); } public void a() { c(); } public void b() { System.out.println("in b"); th.fillInStackTrace(); th.printStackTrace(System.out); System.out.println("in b"); } public void c(){ b(); th.fillInStackTrace(); System.out.println("in c"); th.printStackTrace(System.out); System.out.println("in c"); } public static void main(String [] args) { Exception2 t3 = new Exception2(); t3.a(); } } </span>
上述代码的执行顺序为 main()→a()→b()→c()
打印结果为:
in constructor
in b
java.lang.Throwable
at com.exception.Exception2.b(Exception2.java:23)
at com.exception.Exception2.c(Exception2.java:29)
at com.exception.Exception2.a(Exception2.java:18)
at com.exception.Exception2.main(Exception2.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
in b
in c
java.lang.Throwable
at com.exception.Exception2.c(Exception2.java:30)
at com.exception.Exception2.a(Exception2.java:18)
at com.exception.Exception2.main(Exception2.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
in c
如果把fillInStackTrace 注释掉的话,输出结果则为:
in constructor
in b
java.lang.Throwable
at com.exception.Exception2.<init>(Exception2.java:11)
at com.exception.Exception2.main(Exception2.java:32)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
in b
in c
java.lang.Throwable
at com.exception.Exception2.<init>(Exception2.java:11)
at com.exception.Exception2.main(Exception2.java:32)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
in c
Throwable中的fillInStackTrace