Various compile time errors in Exception Handling

The various compile-time exceptions in Exception Handling are summarized below.
1-Unreported exception
2-Exception has been already been caught & unreachable statement
3-Exception is never thrown in body of the corresponding try block
4-Incompatible types found
5-try without a catch and finally
6-catch without try
7-finally without try

1-Unreported exception:

"These exceptions are thrown if the code does?t have any exception handling code for checked exceptions ."

Example: FileNotFoundException,IOException etc

Demo Example:

package com.navneet.javatutorial;

import java.io.PrintWriter;

public class UnreportedExceptionDemo {

public static void main(String[] args) {

PrintWriter pw=new PrintWriter("D:\UnreportedExceptionDemo.txt");
pw.println("Unreported Exception Demo Example");

}

}

O/P:
Exception in thread ?main? java.lang.Error: Unresolved compilation problem:
Unhandled exception type FileNotFoundException at com.navneet.javatutorial.UnreportedExceptionDemo.main(UnreportedExceptionDemo.java:9)

2-Exception has been already been caught & unreachable statement:

"These exceptions are thrown if the code have multiple catch statement and is already handled by the first catch block."

Demo Example:

package com.navneet.javatutorial;

public class ExceptionDemo {

public static void main(String[] args) {
try {
System.out.println(10 / 0);
} catch (Exception ex) {

} catch (ArithmeticException e) {

}
}

}

O/P:

Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Unreachable catch block for ArithmeticException. It is already handled by the catch block for Exception at com.navneet.javatutorial.ExceptionDemo.main(ExceptionDemo.java:12)

3-Exception is never thrown in body of corresponding try block:

"These exceptions are thrown if the code in try block does not have any checked exceptions and the catch block have exception handling code for that checked exceptions."

Demo Example:

package com.navneet.javatutorial;

import java.io.FileNotFoundException;

public class ExceptionDemo1 {

public static void main(String[] args) {

try{
System.out.println("Hello ");
}
catch(FileNotFoundException ex){

}

}

}

O/P:

Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Unreachable catch block for FileNotFoundException. This exception is never thrown from the try statement body at com.navneet.javatutorial.ExceptionDemo1.main(ExceptionDemo1.java:12)

4-Incomaptiable types found

"These exceptions are thrown if the code have type mismatch problem."

Demo Example:

package com.navneet.javatutorial;

import java.io.FileNotFoundException;
import java.util.Scanner;

public class ExceptionDemo1 {

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);
String name1 = scan.nextLine();
String name2 = scan.nextLine();
int num1 = scan.nextLine();
double num2 = scan.nextLine();
}

}

O/P:

Exception in thread "main" java.lang.Error: Unresolved compilation problems:
Type mismatch: cannot convert from String to int
Type mismatch: cannot convert from String to double at com.navneet.javatutorial.ExceptionDemo1.main(ExceptionDemo1.java:13)

5-try without catch and finally:

"These exceptions are thrown if the code have combination mismatch of any try -catch-finally block.The rest of the below 6 & 7 like 5 type."

Demo Example:

package com.navneet.javatutorial;

public class TryWithoutCatchFinally {

public static void main(String[] args) {

try{
System.out.println("Hello");
}
}

}

O/P:

Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Syntax error, insert "Finally" to complete BlockStatements at com.navneet.javatutorial.TryWithoutCatchFinally.main(TryWithoutCatchFinally.java:9)

6-catch without try:

Demo Example:

package com.navneet.javatutorial;

public class CatchWithoutTryAndFinally {

public static void main(String[] args) {
catch(Exception e){

e.printStackTrace();
}
}

}

O/P:

Exception in thread "main" java.lang.Error: Unresolved compilation problems:
Syntax error on token "catch", ( expected
Syntax error, insert "-> LambdaBody" to complete LambdaExpression
Syntax error, insert "AssignmentOperator Expression" to complete Assignment
Syntax error, insert ";" to complete BlockStatements at com.navneet.javatutorial.CatchWithoutTryAndFinally.main(CatchWithoutTryAndFinally.java:6)

7-finally without try:

Demo Example:

package com.navneet.javatutorial;

public class FinallyWithoutTry {

public static void main(String[] args) {
finally{

System.out.println("Hello");
}
}

}

O/P:

Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Syntax error on token "finally", delete this token at com.navneet.javatutorial.FinallyWithoutTry.main(FinallyWithoutTry.java:6)