Java中获取当前运行代码的类名、方法名、行号

/*   
 * 1.获取当前运行代码的类名，方法名，行号，主要是通过java.lang.StackTraceElement类
 * 
 * 2. 
 *   [1]获得调用者的方法名, 同new Throwable
 *         String _methodName = new Exception().getStackTrace()[1].getMethodName();
 *   [0]获得当前的方法名, 同new Throwable
 *         String _thisMethodName = new Exception().getStackTrace()[0].getMethodName();
 * */
public class StackTraceElementTest {
	
	public static void main(String[] args) {
		System.out.println("line1: " + new Throwable().getStackTrace()[0].getLineNumber());
		System.out.println("line2: " + getLineInfo());
		System.out.println("line3: " + getTraceInfo());

		StackTraceElement ste1 = null;
		StackTraceElement[] steArray = Thread.currentThread().getStackTrace();
		int steArrayLength = steArray.length;
		String s = null;
		// output all related info of the existing stack traces
		if(steArrayLength==0) {
			System.err.println("No Stack Trace.");
		} else {
			for (int i=0; i