java 中打印调用栈

source-code:
public class A {
public A() {}
private static void printStackTrace() {
StackTraceElement[] stackElements = new Throwable().getStackTrace();
if(stackElements != null)
{
for(int i = 0; i < stackElements.length; i++)
{
System.out.println(""+ stackElements[i]);
}
}
}

public void methodA() { methodB(); }
public void methodB() { printStackTrace();}

public static void main(String[] argv) {
A a = new A();
a.methodA();
}
}

output:

A.printStackTrace(A.java:5)
A.methodB(A.java:16)
A.methodA(A.java:15)
A.main(A.java:20)

Note:
StackTraceElement.java

public String toString() {
return getClassName() + "." + methodName +
(isNativeMethod() ? "(Native Method)" :
(fileName != null && lineNumber >= 0 ?
"(" + fileName + ":" + lineNumber + ")" :
(fileName != null ? "("+fileName+")" : "(Unknown Source)")));
}
另外下面这些方法也可以:

new Exception("hello").printStackTrace();
Thread.getStackTrace()/Thread.getAllStackTraces() since jdk 1.5
Thread.currentThread().dumpStack()