import java.util.Scanner;
import java.io.File;


public class Throw{


  public static void main(String[] args){
    Scanner reader;


    if(args.length > 0){
      reader = new Scanner(new File(args[0]));
    }else{
      reader = new Scanner(System.in);
    }
    int x = reader.nextInt();
    System.out.println(x);


  }
}

Checked Exception

8j-except/Throw.java:11: error: unreported exception FileNotFoundException;
must be caught or declared to be thrown
      reader = new Scanner(new File(args[0]));
               ^
1 error

import java.util.Scanner;
import java.io.File;


public class Throw{


  public static void main(String[] args){
    Scanner reader;


    if(args.length > 0){
      reader = new Scanner(new File(args[0]));
    }else{
      reader = new Scanner(System.in);
    }
    int x = reader.nextInt();
    System.out.println(x);


  }
}

import java.util.Scanner;
import java.io.File;


public class Throw{


  public static void main(String[] args) throws FileNotFoundException{
    Scanner reader;


    if(args.length > 0){
      reader = new Scanner(new File(args[0]));
    }else{
      reader = new Scanner(System.in);
    }
    int x = reader.nextInt();
    System.out.println(x);


  }
}

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


public class Throw{


  public static void main(String[] args) throws FileNotFoundException{
    Scanner reader;


    if(args.length > 0){
      reader = new Scanner(new File(args[0]));
    }else{
      reader = new Scanner(System.in);
    }
    int x = reader.nextInt();
    System.out.println(x);


  }
}

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


public class Throw{


  public static void main(String[] args) throws FileNotFoundException{
    Scanner reader;


    if(args.length > 0){
      reader = new Scanner(new File(args[0]));
    }else{
      reader = new Scanner(System.in);
    }
    int x = reader.nextInt();
    System.out.println(x);


  }
}

Custom Exceptions

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


public class Throw{


  public static void main(String[] args) throws FileNotFoundException{
    Scanner reader;


    if(args.length > 0){
      reader = new Scanner(new File(args[0]));
    }else{
      reader = new Scanner(System.in);
    }
    double x = reader.nextDouble();
    double y = reader.nextDouble();


    if(y == 0.0){
      System.out.println("Error");
    }else{
      System.out.println(x / y);
    }
  }
}

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


public class Throw{


  public static void main(String[] args) throws FileNotFoundException{
    Scanner reader;


    if(args.length > 0){
      reader = new Scanner(new File(args[0]));
    }else{
      reader = new Scanner(System.in);
    }
    double x = reader.nextDouble();
    double y = reader.nextDouble();


    if(y == 0.0){
      System.out.println("Error");
    }else{
      System.out.println(x / y);
    }
  }
}

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


public class Throw{


  public static void main(String[] args) throws FileNotFoundException{
    Scanner reader;


    if(args.length > 0){
      reader = new Scanner(new File(args[0]));
    }else{
      reader = new Scanner(System.in);
    }
    double x = reader.nextDouble();
    double y = reader.nextDouble();


    if(y == 0.0){
      throw new ArithmeticException("Divide by Zero!");
    }else{
      System.out.println(x / y);
    }
  }
}

import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
import java.lang.ArithmeticException;


public class Throw{


  public static void main(String[] args) throws FileNotFoundException{
    Scanner reader;


    if(args.length > 0){
      reader = new Scanner(new File(args[0]));
    }else{
      reader = new Scanner(System.in);
    }
    double x = reader.nextDouble();
    double y = reader.nextDouble();


    if(y == 0.0){
      throw new ArithmeticException("Divide by Zero!");
    }else{
      System.out.println(x / y);
    }
  }
}

import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
import java.lang.ArithmeticException;


public class Throw{


  public static void main(String[] args) throws FileNotFoundException{
    Scanner reader;


    if(args.length > 0){
      reader = new Scanner(new File(args[0]));
    }else{
      reader = new Scanner(System.in);
    }
    double x = reader.nextDouble();
    double y = reader.nextDouble();


    if(y == 0.0){
      throw new ArithmeticException("Divide by Zero!");
    }else{
      System.out.println(x / y);
    }
  }
}