Exceptions

1. Arithmetic Exception


  int numerator=4;
int denominator=0;
int result=numerator/denominator;//ArithmeticException


2. NullPointerException


   String name=null;
char result=name.charAt(0);//NullPointerException

3. StringIndexOutOfBoundsException


   String name1="";
char result1=name1.charAt(0);//StringIndexOutOfBoundsException

4. ArrayIndexOutOfBoundsException  


int id[]=new int[3];
id[4]=200; //ArrayIndexOutOfBoundsException

5. NumberFormatException    


String name="james";
int i=Integer.parseInt(name);//NumberFormatException

6. ClassCastException  


Object object = Integer.valueOf(200);
String name = (String)object;       // ClassCastException .


Parent p = new Parent();
Child c = new Child();
c = p; //ClassCastException.


TreeSet treeSet=new TreeSet<>();
treeSet.add(200);
treeSet.add("name");
System.out.println(treeSet);

7. NoSuchElementExcepiton 


Hashtable htable = new Hashtable();
Enumeration enumeration = htable.elements();
enumeration.nextElement();  //java.util.NoSuchElementExcepiton here because enumeration is empty


HashMap htable = new HashMap();
Iterator itr = htable.keySet().iterator();
itr.next();  //java.util.NoSuchElementExcepiton here because iterator is empty


StringTokenizer stoken = new StringTokenizer("", ":");
System.out.println(stoken.nextToken());


8. ClassNotFoundException 


Class.forName("com.mysql.jdbc.Driver");
Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root"); //java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

9. FileNotFoundException 


private static final String filename = "emp.txt";
BufferedReader rd = null;
rd = new BufferedReader(new FileReader(new File(filename)));
String inputLine = null;
while((inputLine = rd.readLine()) != null)
{
                System.out.println(inputLine);
}

10. IllegalArgumentException


int value;
public Test(int value) {
if (value < 0 || value > 100)
{
throw new IllegalArgumentException(Integer.toString(value));
}
}


Test t = new Test(121);
System.out.println(t.value);

11. IllegalStateException


while(it1.hasNext())
{
  //  Object obj1 = it1.next();
    it1.remove();
}

calling it1.remove() without calling it1.next() is an exception. The following code throws IllegalStateException.

12. IllegalAccessException


Set<String> myStr = new HashSet<String>();
myStr.add("obj1");
Iterator itr = myStr.iterator();
Method mtd = itr.getClass().getMethod("hasNext");
System.out.println(m.invoke(it));

Solution:

Method mtd= itr.getClass().getMethod("hasNext");
mtd.setAccessible(true);