Checked Exceptions:

Checked Exceptions are those exceptions which are checked during compile time. If a program contains checked exception then it should be handled using try-catch block or by using throws keyword, otherwise there will be a compile-time error.

Example of Checked Exception:

import java.io.File;
import java.io.FileReader;

public class CheckedExcDemo {

   public static void main(String args[]){		
      File file=new File("E://check.txt");
      FileReader fr = new FileReader(file); 
   }
   
}

The above program will give a checked exception( FileNotFoundException) if the file does not found as provided in the path

Unchecked Exception:

Unchecked Exceptions are those exceptions which are not checked during compile time and exception is thrown during run time. So if we do not handle it using either try/catch block or using throws keyword there will be no compile time error and program will execute but will throw a run time error.

class Example {  
   public static void main(String args[])
   {
	int num1=10;
	int num2=0;
	//Divide by zero Exception will be thrown at run time
	int result=num1/num2;
	System.out.print(result);
   }
}

The above program will throw a runtime exception(ArithmeticException) as it will not show any error during compiling.