Exception in thread "main" java.lang.NullPointerException

[kamalreddy]

class Books{
String title;
String author;
}
class BooksTestDrive{
public static void main(String [] args){
Books[] myBooks=new Books[3];
int x=0;
myBooks[0].title="Harry Potter";
myBooks[1].title="Angels and Demons";
myBooks[2].title="Revolution 2020";
myBooks[0].author="J.K.Rowling";
myBooks[1].author="Dan Brown";
myBooks[2].author="Chetan Bhagat";
while(x<3){
System.out.println(myBooks[x].title);
System.out.print(" by ");
System.out.print(myBooks[x].author);
x=x+1;
}
}
}

[daniel.j2ee]

Your myBooks objects are not initialized. You need to call the constructor on each object inside the vector. eg. mybooks[0] = new Books();

application context