代码行号如何利用Java获取

package leo.demo.training;public class CurrentLine {    public static void main(String[] args) {    StackTraceElement ste1 = null;    // get current thread and its related stack trace    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<steArrayLength; i++) {        System.out.println("Stack Trace-" + i);        ste1 = steArray[i];        s = ste1.getFileName() + ": Line " + ste1.getLineNumber();        System.out.println(s);      }    }    // the following code segment will output the line number of the "new " clause    // that's to say the line number of "StackTraceElement ste2 = new Throwable().getStackTrace()[0];"    StackTraceElement ste2 = new Throwable().getStackTrace()[0];    System.out.println(ste2.getFileName() + ": Line " + ste2.getLineNumber());    // the following clause will output the line number in the external method "getLineInfo()"    System.out.println(getLineInfo());    // the following clause will output its current line number    System.out.println(getLineInfo(new Throwable().getStackTrace()[0]));  }    public static String getLineInfo() {    StackTraceElement ste3 = new Throwable().getStackTrace()[0];    return (ste3.getFileName() + ": Line " + ste3.getLineNumber());  }    public static String getLineInfo(StackTraceElement ste4) {    return (ste4.getFileName() + ": Line " + (ste4.getLineNumber()));  }}