CODEWITHSUNDEEP
java
user3200689
user3200689

Reputation: 11

Array of classes in java

I am a beginner with java. I am trying to create the array of nested classes, and it would not work. In particularly it would not let me initialize array elements after allocation.

public class Salary {

class Person    {
    String name;
    double salary;
    void init (String n, double s)  {
        name = n;
        salary = s;
    }
}

public Salary (String args[])   {    //the input is coming in pairs: name, salary

    Person[] people;                 //creating the array
    people = new Person[10];         //allocating 10 elements in array
    int j = 0;

    for (int i = 0; i < args.length; i+=2)  {      
        people[j].init(args[i], Double.parseDouble(args[i+1]));     //trying to initialize, and that is where it's giving me an error
        System.out.format("%-15s %,10.2f%n",people[j].name, people[j].salary);
        j++;
    }
}

public static void main (String args[]) {
    new Salary(args);
 }
}

Thank you!

Upvotes: 1

Views: 162

Answers (1)

MadProgrammer
MadProgrammer

Reputation: 347194

people = new Person[10]; only allocates space of 10 Person objects, it does not create them.

You need to create an instance of the object and assign to a index within the array, for example

people[j] = new Person();

Try taking a look at Arrays for ore details

You should also consider using the objects constructor rather than an init method

people[j] = new Person(args[i], Double.parseDouble(args[i+1]));

This will, of course, require you to supply a constructor.

Upvotes: 6

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