Detect Java method name from code

http://www.rgagnon.com/javadetails/java-0420.html

JDK1.4

public class MyTest {

public static void main(String args[]) {

new MyTest().doit();

}

public void doit() {

System.out.println

(new Exception().getStackTrace()[0].getMethodName());

}

}

The output

doit

JDK1.5

While the above snippet is not bad, it is expensive since we need to create an Exception.

With JDK1.5, a new technique is available.

public class Test {

public static void main(String args[]) {

trace(Thread.currentThread().getStackTrace());

new Test().doit();

trace(Thread.currentThread().getStackTrace());

}

public void doit() {

trace(Thread.currentThread().getStackTrace());

doitagain();

}

public void doitagain() {

trace(Thread.currentThread().getStackTrace());

}

public static void trace(StackTraceElement e[]) {

boolean doNext = false;

for (StackTraceElement s : e) {

if (doNext) {

System.out.println(s.getMethodName());

return;

}

doNext = s.getMethodName().equals("getStackTrace");

}

}

}

Output

main

doit

doitagain

main