this is an article about the examples of checked and unchecked exception.
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\title{Java Exception}
\author{bsse1004 }
\date{February 2019}
\begin{document}
\maketitle
\section{Example of Checked Exception}
\begin{itemize}
\item IOException : It is thrown when an input-output operation failed or interrupted .IOExceptions are thrown when there is any input / output file operation issues while application performing certain tasks accessing the files. IOException is a checked exception.
\begin{itemize}
\begin{lstlisting}
static ArrayList<BufferedImage> getFrames(File gif) throws IOException {
ArrayList<BufferedImage> frames = new ArrayList<BufferedImage>();
ImageReader ir = new GIFImageReader(new GIFImageReaderSpi());
ir.setInput(ImageIO.createImageInputStream(gif));
for (int i = 0; i < ir.getNumImages(true); i++) {
frames.add(ir.read(i));
}
// Release resources for Garbage Collection
ir.dispose();
return frames;
}
\end{lstlisting}
\end{itemize}
\item FileNotFoundException : This Exception is raised when a file is not accessible or does not open.
\begin{itemize}
\item example :
\begin{lstlisting}
//Java program to demonstrate FileNotFoundException
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
class File_notFound_Demo {
public static void main(String args[]) {
try {
// Following file does not exist
File file = new File("E://file.txt");
FileReader fr = new FileReader(file);
} catch (FileNotFoundException e) {
System.out.println("File does not exist");
}
}
}
\end{lstlisting}
\end{itemize}
\item NoSuchFieldException : It is thrown when a class does not contain the field (or variable) specified.
\item ClassNotFoundException :This Exception is raised when we try to access a class whose definition is not found
\item NoSearchMethodException : It is thrown when accessing a method which is not found.
\end{itemize}
\section{Example of Unchecked Exception}
\begin{itemize}
\item 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.
\begin{itemize}
\item Example :
\begin{lstlisting}
// Java program to demonstrate ArrayIndexOutOfBoundException
class ArrayIndexOutOfBound_Demo
{
public static void main(String args[])
{
try{
int a[] = new int[5];
a[6] = 9; // accessing 7th element in an array of
// size 5
}
catch(ArrayIndexOutOfBoundsException e){
System.out.println ("Array Index is Out Of Bounds");
}
}
}
\end{lstlisting}
\end{itemize}
\item Arithmetic Exception : It is thrown when an exceptional condition has occurred in an arithmetic operation.
\begin{itemize}
\item Example
\begin{lstlisting}
// Java program to demonstrate ArithmeticException
class ArithmeticException_Demo
{
public static void main(String args[])
{
try {
int a = 30, b = 0;
int c = a/b; // cannot divide by zero
System.out.println ("Result = " + c);
}
catch(ArithmeticException e) {
System.out.println ("Can't divide a number by 0");
}
}
}
\end{lstlisting}
\end{itemize}
\item IllegalArgumentException : IllegalArgumentException is intended to be used anytime a method is called with any argument(s) that is improper, for whatever reason.
\item StringIndexOutOfBoundsException : It is thrown by String class methods to indicate that an index is either negative than the size of the string
\begin{itemize}
\item Example:
\begin{lstlisting}
// Java program to demonstrate StringIndexOutOfBoundsException
class StringIndexOutOfBound_Demo
{
public static void main(String args[])
{
try {
String a = "This is like chipping "; // length is 22
char c = a.charAt(24); // accessing 25th element
System.out.println(c);
}
catch(StringIndexOutOfBoundsException e) {
System.out.println("StringIndexOutOfBoundsException");
}
}
}
\end{lstlisting}
\end{itemize}
\item NullPointerException : This exception is raised when referring to the members of a null object. Null represents nothing
\begin{itemize}
\item Example
\begin{lstlisting}
//Java program to demonstrate NullPointerException
class NullPointer_Demo
{
public static void main(String args[])
{
try {
String a = null; //null value
System.out.println(a.charAt(0));
} catch(NullPointerException e) {
System.out.println("NullPointerException..");
}
}
}
\end{lstlisting}
\end{itemize}
\item NumberFormatException : This exception is raised when a method could not convert a string into a numeric format.
\begin{itemize}
\item Example
\begin{lstlisting}
// Java program to demonstrate NumberFormatException
class NumberFormat_Demo
{
public static void main(String args[])
{
try {
// "akki" is not a number
int num = Integer.parseInt ("akki") ;
System.out.println(num);
} catch(NumberFormatException e) {
System.out.println("Number format exception");
}
}
}
\end{lstlisting}
\end{itemize}
\item AssertionError : the AssertionError in Java is thrown when an assert statement fails (i.e. the result is false).
\item ExceptionInInitializerError :ExceptionInInitializerError, which is thrown when an error occurs within the static initializer of a class or object. Since an ExceptionInInitializerError isn’t ever the cause of a thrown error, catching such an exception provides an underlying causal exception that indicates what the actual source of the issue was.
\item StackOverflowError : The StackOverflowError in Java occurs when the application performs excessively deep recursion. However, what exactly qualifies as “excessively deep” depends on many factors.
\item NoClassDefFoundError : In most cases, a java.lang.NoClassDefFoundError is thrown when a class reference was available during compile time, but has since disappeared (for whatever reason) during execution.
\end{itemize}
\end{document}