ERROR - Cannot Cast from x to y

Error

Cannot Cast from x to y

Error Type 

Compile Time

Sample Code 

class Car extends Vehicle {

public static void main(String[] args){

Vehicle v1 = new Vehicle();

String c1 = (String)v1;

c1.toString();

}

}

Cause

Casting Can be done only among related types. 

Resolution

Either remove the cast or establish relationship among the classes.