本文實例講述了Java編程實現獲取當前代碼行行號的方法。分享給大家供大家參考，具體如下：
最近的項目中，為了實現自定義的log類，能夠輸出具體的代碼行行號，我通過使用StackTraceElement對象實現了。
具體內容請參考下面的Demo代碼。這里指出需要注意的幾個問題：
1. 程序中返回的代碼行行號，是新建StackTrackElement對象的那一行。
2. 可以通過傳參的方法實現輸出特定行行號。
具體實現代碼：
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/****/package leo.demo.training;/*** Get current java file name and current code line number* @author Leo Xie*/public class CurrentLine { /** * @param args */ 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])); } /** * return current java file name and code line number * @return String */ public static String getLineInfo() { StackTraceElement ste3 = new Throwable().getStackTrace()[0]; return (ste3.getFileName() + ": Line " + ste3.getLineNumber()); } /** * return current java file name and code line name * @return String */ public static String getLineInfo(StackTraceElement ste4) { return (ste4.getFileName() + ": Line " + (ste4.getLineNumber())); }} |
希望本文所述對大家java程序設計有所幫助。
原文鏈接：http://www.cnblogs.com/xxpal/articles/1209378.html
