Java exception

Throw io exception java

public static void foo() throws IOException {
    // some code here, when something goes wrong, you might do:
    throw new IOException("error message");
}

public static void main(String[] args) {
    try {
        foo();
    } catch (IOException e) {
        System.out.println(e.getMessage());
    }
}

Source: stackoverflow.com

Try catch java

public class MyClass {
  public static void main(String[ ] args) {
    try {
      int[] myNumbers = {1, 2, 3, 4, 5, 6};
      System.out.println(myNumbers[10]);
    } catch (Exception e) {
      System.out.println("Something went wrong. check again");
    }
  }
}

What is exception in java

An exception is an event, which occurs during the execution of a 
program, that disrupts the normal flow of the program's instructions.

Exception handling in java

public class JavaExceptionExample{  
  public static void main(String args[]){  
   try{  
      //code that may raise exception  
      int data=100/0;  
   }catch(ArithmeticException e){System.out.println(e);}  
   //rest code of the program   
   System.out.println("rest of the code...");  
  }  
}

Java exception

    - ArithmeticException 
    It is thrown when an exceptional condition has occurred in an arithmetic operation.
    
    - ArrayIndexOutOfBoundsException 
    It is thrown to indicate that an array has been accessed with an illegal index. The index is either negative or greater than or equal to the size of the array.
    
    - ClassNotFoundException 
    This Exception is raised when we try to access a class whose definition is not found
    
    - FileNotFoundException 
    This Exception is raised when a file is not accessible or does not open.
    
    - IOException 
    It is thrown when an input-output operation failed or interrupted
    
    - InterruptedException 
    It is thrown when a thread is waiting, sleeping, or doing some processing, and it is interrupted.
    
    - NoSuchFieldException 
    It is thrown when a class does not contain the field (or variable) specified
    
    - NoSuchMethodException 
    It is thrown when accessing a method which is not found.
    
    - NullPointerException 
    This exception is raised when referring to the members of a null object. Null represents nothing
    
    - NumberFormatException 
    This exception is raised when a method could not convert a string into a numeric format.
    
    - RuntimeException 
    This represents any exception which occurs during runtime.
    
    - StringIndexOutOfBoundsException 
    It is thrown by String class methods to indicate that an index is either negative or greater than the size of the string

Exceptions in java

Unchecked:
-IndexOutOfBounds exception(while working with arrays/strings)
-NullPointerException(if I forget to instantiate the objects)
-ArithmaticException

Checked:
-IOException
-SQLException
-FileNotFountException

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