Java StackTraceElement getFileName() Method

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Description

The Java StackTraceElement getFileName() method returns the name of the source file containing the execution point represented by this stack trace element.

Declaration

Following is the declaration for Java StackTraceElement getFileName() method

public String getFileName()

Parameters

NA

Return Value

This method returns the name of the file containing the execution point represented by this stack trace element, or null if this information is unavailable.

Exception

NA

Example: Getting Current Thread File Name using StackTraceElement

The following example shows the usage of Java StackTraceElement getFileName() method. In this program, we've defined a function named function2() which gets the file name from StackTraceElement of current thread. Another function named function1() is used to instantiate the StackTraceElementDemo class and call the function2() method. In main method, we've called the function1() method and result is printed.

package com.tutorialspoint;

public class StackTraceElementDemo {

   // main method
   public static void main(String[] args) {
      // call function1() to invoke function2()     
      function1();
   }
   
   // function1() is to invoke function2()
   // using StackTraceElementDemo object
   public static void function1() {
      new StackTraceElementDemo().function2();
   }
 
   // print the file name of current thread using StackTraceElement
   public void function2() {
      System.out.print("File name : ");
      System.out.print(Thread.currentThread().getStackTrace()[1].
      getFileName());
   }
}

Output

Let us compile and run the above program, this will produce the following result −

File name : StackTraceElementDemo.java

Example: Getting File Name using ArithmeticException's StackTraceElement

The following example shows the usage of Java StackTraceElement getFileName() method. In main method, we've created three int variables where one variable is carrying zero value. In try-catch block, we've created a divide by zero scenario to raise an ArithmeticException. In catch block, we've handled the ArithmeticException, retrieved an array of StackTraceElement from it using getStackTrace() method and then using getFileName() method on first element of the array, the file name is printed.

package com.tutorialspoint;

public class StackTraceElementDemo {

   public static void main(String[] args) {

      // variables to store int values
      int a = 0, b = 1, c;

      try {
         // being divide by zero, this line will throw an ArithmeticException
         c = b / a;
      }catch(ArithmeticException e) {
         // get the array of StackTraceElement
         StackTraceElement[] stackTraceElements =  e.getStackTrace();
         // print the file name
         System.out.println(stackTraceElements[0].getFileName());
      }
   }
}  

Output

Let us compile and run the above program, this will produce the following result −

StackTraceElementDemo.java

Example: Getting File Name using Exception's StackTraceElement

The following example shows the usage of Java StackTraceElement getFileName() method. In main method, we've created three int variables where one variable is carrying zero value. In try-catch block, we've created a divide by zero scenario to raise an ArithmeticException. In catch block, we've handled the Exception, retrieved an array of StackTraceElement from it using getStackTrace() method and then using getFileName() method on first element of the array, the file name is printed.

package com.tutorialspoint;

public class StackTraceElementDemo {

   public static void main(String[] args) {

      // variables to store int values
      int a = 0, b = 1, c;

      try {
         // being divide by zero, this line will throw an ArithmeticException
         c = b / a;
      }catch(Exception e) {
         // get the array of StackTraceElement
         StackTraceElement[] stackTraceElements =  e.getStackTrace();
         // print the file name
         System.out.println(stackTraceElements[0].getFileName());
      }
   }
}  

Output

Let us compile and run the above program, this will produce the following result −

StackTraceElementDemo.java