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hello sorry i havent been able to get back to this, been working.



public void displayBooks(){
for (int i=0;i<books.length;i++){
System.out.println("Code: " + books[i].getCode()); ...

Hi there writing a small program for borrowing and lending books, the code compiles but alot of the time when i run this code i get "java.lang.NullPointerException" and the program stops working.
...

yeah thank you guys i got it to work :)

so here is the code fragment

private int getChoice(int lower, int upper) {
System.out.println("--------------------------------------------------------------");
System.out.println("Please...