class Demo{
	private int num;
	public void display(int n) throws Exception{
		if( n == 0 ){
			throw new Exception("canot assign zero");
		}
		else if(n < 0){
			throw new Exception("canot assign -ve value");
		}
		else{
			System.out.println("\n\n\tValid value");
			num = n;
		}
	}
}
public class ThrowsDemo{
	public static void main(String args[]){
		Demo ob = new Demo();
		try{
			ob.display(-8);
			//ob.display(10);
		}
		catch(Exception e){
			System.out.println("\n Error: "+ e);
		}
		System.out.println("\n\n");
	}
}

Error: java.lang.Exception: canot assign -ve value

class Test1{
	public static void main(String args[]){
		int a,b;
		try
		{
			a=Integer.parseInt(args[0]);
			b=Integer.parseInt(args[1]);
			System.out.println(a/b);
		}
		catch(NumberFormatException ee)
		{
			System.out.println("Number Format Exception Raised "+ee);
		}
		catch(ArithmeticException ee)
		{
			System.out.println("ArithmeticException Raised because 
				you divide a number with zero "+ee);
		}
		catch(Exception ee) //this block gona be last 
		{
			System.out.println("Miscellaneous Exception Raised"+ee); 
		}
	}
}	

Miscellaneous Exception Raisedjava.lang.ArrayIndexOutOfBoundsException: 0

public class Check{
    public static void main(String[] args) {
        String a = null;
		String b = "Hello";
		if(b!=null){
			System.out.println("B is "+b.length());
		}
		if(a!=null){
			System.out.println("A is "+a.length());
		}
		System.out.println("Now This line never execute...")
	}
}

B is 5
Now This line never execute...

//Step-1 Creating Custom Exception class
import java.io.*;
class MyException extends Exception{
	int age;
    MyException(){                        
  	}
    MyException(int age){
	  	this.age=age;
  	}
	public String toString(){
		return "Age Cannot be less than 18 and your 
			entered age is "+age+" So u can't vote";
	}
}

//Step-2 Using CustomException
public class ExceptionDemo{
	public static void main(String[] args) throws Exception{
		BufferedReader br=new BufferedReader(new 
		InputStreamReader(System.in));
		System.out.println("Enter the Age");
		int age=Integer.parseInt(br.readLine());
    	try{
      		if(age<18)
		      throw new MyException(age);
      		else
		      System.out.println("Yes you can vote ");
        }
		catch(MyException ee){
			System.out.println(ee);
		}
	}
}

Enter the Age
40
Yes you can vote

class Test{
	public static void main(String args[]) {
		int a,b;
		try{
			a=Integer.parseInt(args[0]);
			b=Integer.parseInt(args[1]); 
			System.out.println(a+b); 
		}
		catch(NumberFormatException ee){
			System.out.println("Number Format Exception 
				Raised because you not enter number between 0-9"+ee);
			// a stack trace from where the exception 
				//occurred will be printed.
			ee.printStackTrace();
		}
	}
}

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
        at Test.main(Test.java:9)

class Test{
	public static void main(String args[]){
		try {
			int x[]=new int[10]; 
			x[11]=100;
		} 
		catch(ArrayIndexOutOfBoundsException ee) {
			System.out.println(ee);
		}
	}
}

java.lang.ArrayIndexOutOfBoundsException: 11