Thread: JAVA programming language

I am learning JAVA programming language. I have little bit knowledge of JAVA.I want to know that why we use an exceptions but I don't know how to throw it. Please give me some proper solution for that. Thanks in advanced.

You can use single argument for throw statement, which is a throwable object. Objects are instances of any subclass of the Throwable class. Try to understand following code given below.

Code:

class ExceptionDemo extends Exception {
public ExceptionDemo(String msg){
super(msg);
}
}

public class Test {

static int  divide(int first,int second) throws ExceptionDemo{ 
  if(second==0) 
  throw new ExceptionDemo("can't be divided by zero");
return first/second;
 }
 public static void main(String[] args) {
  try {
System.out.println(divide(4,0));
  }
catch (ExceptionDemo excp) {
excp.printStackTrace();
  }
  }
}