Java StackTraceElement instance code

This article mainly studies related contents of Java StackTraceElement, as follows.

• StackTrace saves the method call information in the form of a stack.
• You can use the Thread.currentThread().getStackTrace() method to get the StackTrace information of the current thread. This method returns a StackTraceElement array.
• In the thread, methodA calls methodB, then methodA first enters methodB and then enters the stack. The first element of the array saves the top element of the stack and the last element saves the bottom element of the stack. It's exactly the opposite order of the call stack.
• The file name of the current method belongs to the element subscripted by 2 of the StackTraceElement array is saved, the class name of the current method belongs to, and the name of the method. In addition, you can also get the number of rows of the method call. This feature can be used to design log modules.

Example:

 package com.demo.test;public class StackTraceDemo {public static void testA() {testB();}public static void testB() {StackTraceElement[] stackTraceElements = Thread.currentThread().getStackTrace();System.out.println("-------> StackTraceElement[]");for (int i = 0; i < stackTraceElements.length; i++) {System.out.println("-------> " + i);System.out.println(stackTraceElements[i]);System.out.println("StackTraceElement.getClassName() => " + stackTraceElements[i].getClassName());System.out.println("StackTraceElement.getFileName() => " + stackTraceElements[i].getFileName());System.out.println("StackTraceElement.getLineNumber() => " + stackTraceElements[i].getFileName());System.out.println("StackTraceElement.getLineNumber() => " + stackTraceElements[i].getLineNumber());System.out.println("StackTraceElement.getMethodName() => " + stackTraceElements[i].getMethodName());System.out.println("StackTraceElement.isNativeMethod() => " + stackTraceElements[i].isNativeMethod());}}public static String getMethodName() {StackTraceElement[] stackTraceElements = Thread.currentThread().getStackTrace();if(stackTraceElements.length > 2) {return stackTraceElements[2].getMethodName();}return null;}public static void main(String[] args) {testA();System.out.println("/nthis's method name is " + getMethodName());}}

Output:

--------> StackTraceElement[]
-------> 0
java.lang.Thread.getStackTrace(Unknown Source)
StackTraceElement.getClassName() => java.lang.Thread
StackTraceElement.getFileName() => null
StackTraceElement.getLineNumber() => -1
StackTraceElement.getMethodName() => getStackTrace
StackTraceElement.isNativeMethod() => false
-------> 1
com.demo.test.StackTraceDemo.testB(StackTraceDemo.java:10)
StackTraceElement.getClassName() => com.demo.test.StackTraceDemo
StackTraceElement.getFileName() => StackTraceDemo.java
StackTraceElement.getLineNumber() => 10
StackTraceElement.getMethodName() => testB
StackTraceElement.isNativeMethod() => false
-------> 2
com.demo.test.StackTraceDemo.testA(StackTraceDemo.java:6)
StackTraceElement.getClassName() => com.demo.test.StackTraceDemo
StackTraceElement.getFileName() => StackTraceDemo.java
StackTraceElement.getLineNumber() => 6
StackTraceElement.getMethodName() => testA
StackTraceElement.isNativeMethod() => false
-------> 3
com.demo.test.StackTraceDemo.main(StackTraceDemo.java:32)
StackTraceElement.getClassName() => com.demo.test.StackTraceDemo
StackTraceElement.getFileName() => StackTraceDemo.java
StackTraceElement.getLineNumber() => 32
StackTraceElement.getMethodName() => main
StackTraceElement.isNativeMethod() => false

this's method name is main

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