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Try Catch Block

Java try block:


Java try block is used to enclose the code that might throw an exception. It must be used within the method.

If an exception occurs at the particular statement of try block, the rest of the block code will not execute. So, it is recommended not to keeping the code in try block that will not throw an exception.

Java try block must be followed by either catch or finally block.

 

Java catch block:


Java catch block is used to handle the Exception by declaring the type of exception within the parameter. The declared exception must be the parent class exception ( i.e., Exception) or the generated exception type. However, a good approach is to declare the generated type of exception.

The catch block must be used after the try block only. You can use multiple catch block with a single try block.

How to use a try-catch clause

 try {
 // block of code to monitor for errors
 // the code you think can raise an exception
 } 
 catch (ExceptionType1 exOb) {
 // exception handler for ExceptionType1
 } 
 catch (ExceptionType2 exOb) {
 // exception handler for ExceptionType2
 }

 

Points to remember :

  • In a method, there can be more than one statement that might throw an exception, So put all these statements within its own try block and provide a separate exception handler within own catch block for each of them.
  • If an exception occurs within the try block, that exception is handled by the exception handler associated with it. To associate an exception handler, we must put catch block after it. There can be more than one exception handler. Each catch block is an exception handler that handles the exception of the type indicated by its argument. The argument, ExceptionType declares the type of the exception that it can handle and must be the name of the class that inherits from Throwable class.
  • For each try block there can be zero or more catch blocks, but only one finally block.

Consider the below code and guess the output for it:

class InterviewBit
{ 
    public static void main (String[] args)  
    { 
          
        // array of size 4. 
        int[] arr = new int[10]; 
        try
        { 
            int i = arr[14]; 
            System.out.print("A" + " "); 
        } 
        catch(ArrayIndexOutOfBoundsException ex) 
        { 
            System.out.print("B"+ " "); 
        } 
        System.out.println("C"); 
    } 
} 
Hints
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