Creating Exception

class Myexception extends Exception{
private int detail;
Myexecption(int a){
detail=a;
}
public String toString(){
return "Myexception["+detail+"]";
}
}

class Exceptiondemo{
static void Compute(int a) throws Myexception{
System.out.println("Called compute("+a+")");
if(a>10) throw new Myexception(a);
System.out.println("Normal Exit");
}
public static void main(String args[]){
try{
Compute(1);
Compute(20);
}catch(Myexception e){
System.out.println("Caught"+e);
}
}
}

hi to all please help me friends here i created my own exception(Myexception), but its showing invalid method declaration; return type required for Myexception(int a).and thank in advance friendss. Happy new year