Java - Exception Handling

Avoid the interruption in between normal flow of the application in other words to control the flow of the application.

Types:

1. Compile Time Exception (Checked Exception):

                This will happened at compile time. It should be handled by programmer.

               SQL Exception

                IO Exception

private static String filepath = "D:\User\guest\Desktop\File2.txt";

    public static void main(String[] args) {

        BufferedReader br1 = null;

        String curline;

        try {

            br1 = new BufferedReader(new FileReader(filepath));

                ClassNotFound Excepection

private static final String CLASS_TO_LOAD = "main.java.Utils";

    public static void main(String[] args) {

        try {

            Class loadedClass = Class.forName(CLASS_TO_LOAD);

2. Run Time Exception (Un Checked Exception):

                This will occur at program run time. Like logical error.

               Null Pointer Exception

        String a1 = null; // null value

            System.out.println(a1.charAt(0));

                ArrayIndexOutOfBoundary Exception

        int b[] = new int[6];

            b[8] = 2; // we are trying to access 9th element in an array of size 7

                Numberformat Exception

          int n = Integer.parseInt ("Test") ;

            System.out.println(n);

                Arithmetic Exception:

               int p = 30, q = 0;

            int r = p/q;  // It cannot be divided by zero

                

Error:

                Error is nothing but based on system issue. Like java memory space. Or other memory space issue.