Java Tutorial

This Java tutorial is tailored for newcomers, offering a journey from basic principles to complex Java programming techniques. Completing this tutorial equips you with a solid understanding of Java, preparing you for advanced learning. You'll emerge ready to tackle the challenges of becoming a top-tier software engineer, with the skills to innovate and excel in the vast world of software development.

Built-in Exceptions
Built-in Exceptions in Java
Java defines several exception classes inside the standard package java.lang.
The most general of these exceptions are subclasses of the standard type RuntimeException. Since java.lang is implicitly imported into all Java programs, most exceptions derived from RuntimeException are automatically available.
Types of Java Built-in Exceptions
Built-in Exceptions in Java are categorized into two categories Checked Exceptions and Unchecked Exceptions.
Checked Exceptions: The checked exceptions are handled by the programmer during writing the code, they can be handled using the try-catch block. These exceptions are checked at compile-time.
Unchecked Exceptions: The unchecked exceptions are not handled by the programmer. These exceptions are thrown on run-time. Some of the unchecked exceptions are NullPointerException, ArrayIndexOutOfBoundsException, ArithmeticException, etc.
Common Built-in Exceptions in Java
Java defines several other types of exceptions that relate to its various class libraries. Following is the list of Java Unchecked and Checked RuntimeException.
Sr.No.
Exception & Description
1
ArithmeticException
Arithmetic error, such as divide-by-zero.
2
ArrayIndexOutOfBoundsException
Array index is out-of-bounds.
3
ArrayStoreException
Assignment to an array element of an incompatible type.
4
ClassCastException
Invalid cast.
5
IllegalArgumentException
Illegal argument used to invoke a method.
6
IllegalMonitorStateException
Illegal monitor operation, such as waiting on an unlocked thread.
7
IllegalStateException
Environment or application is in incorrect state.
8
IllegalThreadStateException
Requested operation not compatible with the current thread state.
9
IndexOutOfBoundsException
Some type of index is out-of-bounds.
10
NegativeArraySizeException
Array created with a negative size.
11
NullPointerException
Invalid use of a null reference.
12
NumberFormatException
Invalid conversion of a string to a numeric format.
13
SecurityException
Attempt to violate security.
14
StringIndexOutOfBounds
Attempt to index outside the bounds of a string.
15
UnsupportedOperationException
An unsupported operation was encountered.
16
ClassNotFoundException
Class not found.
17
CloneNotSupportedException
Attempt to clone an object that does not implement the Cloneable interface.
18
IllegalAccessException
Access to a class is denied.
19
InstantiationException
Attempt to create an object of an abstract class or interface.
20
InterruptedException
One thread has been interrupted by another thread.
21
NoSuchFieldException
A requested field does not exist.
22
NoSuchMethodException
A requested method does not exist.
Examples of Java Built-in Exception
Example 1: Demonstrating Arithmetic Exception Without try-catch
In this example, we're creating an error by dividing a value by 0. In this case, an unchecked exception will be raised. Being unchecked, compiler won't complain and program will compile successfully. Once program runs, the exception will be thrown and JVM will intercepts the same and terminate the program before printing the last statement.
package com.tutorialspoint;
﻿
public class ExcepTest {
﻿
   public static void main(String args[]) {
        
      int b = 0;
      int c = 1/b;
      System.out.println("c :" + c);
   }
}
Output
Exception in thread "main" java.lang.ArithmeticException: / by zero
	at com.tutorialspoint.ExcepTest.main(ExcepTest.java:8)
Example 2: Demonstrating Arithmetic Exception With try-catch
In this example, we're handling unchecked exception. As first step, we're generating an error by dividing a value by 0. In this case, an unchecked exception will be raised. We're handling via ArithmeticException. Once program runs, the exception will be thrown and catch block will intercepts the same and print the last statement.
package com.tutorialspoint;
﻿
public class ExcepTest {
﻿
   public static void main(String args[]) {
      try {
         int b = 0;
         int c = 1/b;
         System.out.println("c :" + c);
      }
      catch (ArithmeticException e) {
         System.out.println("Exception thrown  :" + e);
      }
      System.out.println("Out of the block");
   }
}
Output
Exception thrown  :java.lang.ArithmeticException: / by zero
Out of the block
Example 3: Demonstrating No Such Method Exception
In this example, we're showcasing that a checked exception is to be handled by code otherwise compiler will complain. Whenever a method throws a checked exception, it has to either handle the exception or declare throws exception statement as we're doing for getName() method. When we try to run the method, JVM complains the compilation problem as shown in output listed below:
package com.tutorialspoint;
﻿
public class ExcepTest {
﻿
   public static void main(String args[]) {
      ExcepTest excepTest = new ExcepTest();
      excepTest.getName();
   }
   
   private String getName() throws NoSuchMethodException {
	   throw new NoSuchMethodException();
   }
}
Output
Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
    Unhandled exception type NoSuchMethodException
﻿
    at com.tutorialspoint.ExcepTest.main(ExcepTest.java:7)
﻿
﻿
﻿
﻿

Sr.No.	Exception & Description
1	ArithmeticException Arithmetic error, such as divide-by-zero.
2	ArrayIndexOutOfBoundsException Array index is out-of-bounds.
3	ArrayStoreException Assignment to an array element of an incompatible type.
4	ClassCastException Invalid cast.
5	IllegalArgumentException Illegal argument used to invoke a method.
6	IllegalMonitorStateException Illegal monitor operation, such as waiting on an unlocked thread.
7	IllegalStateException Environment or application is in incorrect state.
8	IllegalThreadStateException Requested operation not compatible with the current thread state.
9	IndexOutOfBoundsException Some type of index is out-of-bounds.
10	NegativeArraySizeException Array created with a negative size.
11	NullPointerException Invalid use of a null reference.
12	NumberFormatException Invalid conversion of a string to a numeric format.
13	SecurityException Attempt to violate security.
14	StringIndexOutOfBounds Attempt to index outside the bounds of a string.
15	UnsupportedOperationException An unsupported operation was encountered.
16	ClassNotFoundException Class not found.
17	CloneNotSupportedException Attempt to clone an object that does not implement the Cloneable interface.
18	IllegalAccessException Access to a class is denied.
19	InstantiationException Attempt to create an object of an abstract class or interface.
20	InterruptedException One thread has been interrupted by another thread.
21	NoSuchFieldException A requested field does not exist.
22	NoSuchMethodException A requested method does not exist.

Java Tutorial

Java Control Statements

Object Oriented Programming

Java Built-in Classes

Java File Handling

Java Error & Exceptions

Java Multithreading

Java Synchronization

Java Networking

Java Collections

Java List Interface

Java Queue Interface

Java Map Interface

Java Set Interface

Java Data Structures

Java Collections Algorithms

Java Miscellaneous

Java Tutorial

Built-in Exceptions

Built-in Exceptions in Java

Types of Java Built-in Exceptions

Common Built-in Exceptions in Java

Examples of Java Built-in Exception

Example 1: Demonstrating Arithmetic Exception Without try-catch

Output

Example 2: Demonstrating Arithmetic Exception With try-catch

Output

Example 3: Demonstrating No Such Method Exception

Output