Java中什么时候使用fulInStackTrace()方法

fillInStackTrace()是Java中Throwable类的重要方法。堆栈跟踪对于确定在何处抛出异常很有用。在某些情况下，我们需要重新抛出异常并找出重新抛出的异常，在这种情况下，我们可以使用fillInStackTrace()方法。

语法

public Throwable fillInStackTrace()

示例

public class FillInStackTraceTest { public static void method1() throws Exception { throw new Exception("This is thrown from method1()"); } public static void method2() throws Throwable { try { method1(); } catch(Exception e) { System.err.println("Inside method2():"); e.printStackTrace(); throw e.fillInStackTrace(); //调用fillInStackTrace()方法 } } public static void main(String[] args) throws Throwable { try { method2(); } catch (Exception e) { System.err.println("Caught Inside Main method()"); e.printStackTrace(); } } }

输出结果

Inside method2(): java.lang.Exception: This is thrown from method1() at FillInStackTraceTest.method1(FillInStackTraceTest.java:3) at FillInStackTraceTest.method2(FillInStackTraceTest.java:7) at FillInStackTraceTest.main(FillInStackTraceTest.java:18) Caught Inside Main method() java.lang.Exception: This is thrown from method1() at FillInStackTraceTest.method2(FillInStackTraceTest.java:12) at FillInStackTraceTest.main(FillInStackTraceTest.java:18)