Java StackTraceElement getLineNumber() Method

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Description

The Java StackTraceElement getLineNumber() method returns the line number of the source line containing the execution point represented by this stack trace element.

Declaration

Following is the declaration for java.lang.StackTraceElement.getLineNumber() method

public int getLineNumber()

Parameters

NA

Return Value

This method returns the line number of the source line containing the execution point represented by this stack trace element, or a negative number if this information is unavailable.

Exception

NA

Example: Getting Current Thread Line Number using StackTraceElement

The following example shows the usage of Java StackTraceElement getLineNumber() method. In this program, we've defined a function named function2() which gets the line number 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 line number of current thread using StackTraceElement
   public void function2() {
      System.out.print("Line Number : ");
      System.out.print(Thread.currentThread().getStackTrace()[1].
      getLineNumber());
   }
}

Output

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

Line Number : 20

Example: Getting Line Number using ArithmeticException's StackTraceElement

The following example shows the usage of Java StackTraceElement getLineNumber() 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 getLineNumber() method on first element of the array, the line number 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 line number
         System.out.println(stackTraceElements[0].getLineNumber());
      }
   }
}  

Output

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

12

Example: Getting Line Number using Exception's StackTraceElement

The following example shows the usage of Java StackTraceElement getLineNumber() 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 getLineNumber() method on first element of the array, the line number 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 line number
         System.out.println(stackTraceElements[0].getLineNumber());
      }
   }
}  

Output

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

12