Thread: Array with null (same for Arraylist)

I'm having a problem with calling arrays from a class. I know I should should separate the user interface from the logic so that's what I've tried to do. If you know of a better way please mention that too

Anyway, when ever I use an array list, it always starts with "null". The only fix I've been able to find is by chopping off the first few characters.

This is an example of which the output is:

nullname1
name2
name3
name4
name5

student students = new student();
System.out.println(students.getStudent());

public class student {
 
	private String student;
 
	public String getStudent() {
 
	String[] students = {"name1","name2","name3","name4","name5"};
 
		for (int i = 0; i < students.length; i++) {
			student = student + students[i] + "\n";
		}
 
	return student;
	}
 
 
}

Thanks

Write out exactly how your look is working, concentrating on the initial value of the variable student (hint, String is an object which when not instantiated to any value is by default null)

You never initially initialized the student string so Java by default assigns it the value of null. Before your for loop, try setting student to the empty string.

That works the first time getStudent() is called, but what happens if someone calls getStudent() again?

There's really no reason student should be an object field, move it in as a local variable of getStudent().