CODEWITHSUNDEEP
javaarraysobjectparameters
Ivan Pantic
Ivan Pantic

Reputation: 7

Passing array as a parameter of object problem

I want to pass array as a parameter of object but I am kind of stack. So here is my problem.

public class Publisher {

    public static void main(String args[]) {
        String teachers[] = {"Jyothi", "Jyostna", "Sumathi"};
        Publisher2 p1 = new Publisher2(teachers[1],20);       //The problem is here, I can't specify 
     //index of array (I can put onlu teachers without index[1])so toString method is returning address of object instead of the name
        System.out.println(p1);
    }
}

class Publisher2 {

    String[] teachers;
    int y;

    public Publisher2(String[] teachers, int y) {
        this.teachers = teachers;
        this.y = y;
    }

    @Override
    public String toString() {
        return "Publisher2{" + "teachers=" + teachers + ", y=" + y + '}';
    }
}

Upvotes: 0

Views: 85

Answers (3)

AndrewF
AndrewF

Reputation: 1906

Since you have clarified your question in various comments (please edit your question), we now know that you want to pass a single item, but you have implied in code and comments that Publisher2 must be constructed with an array as a parameter.

Therefore, you will need to build a new array containing the single item.

String[] teacherSubset = new String[] { teachers[1] };
Publisher2 p1 = new Publisher2(teacherSubset, 20);

or...

Publisher2 p1 = new Publisher2(new String[] { teachers[1] }, 20);

Please edit your question so that it is clear about exactly what you are trying to accomplish.

Upvotes: 0

hjoeren
hjoeren

Reputation: 589

Another possibility would be to use varargs and swap the parameters (the varargs have to be the last in the parameter list):

public Publisher2(int y, String... teachers) {
  this.teachers = teachers;                   
  this.y = y;                                 
}

With this approach you can pass as many arguments (none, a single, multiple or an array):

new Publisher2(20);
new Publisher2(20, teachers[0]);
new Publisher2(20, teachers);

With the toString problem you can use java.util.Arrays, so that the toString looks like this:

@Override                                                                           
public String toString() {                                                          
  return "Publisher2{" + "teachers=" + Arrays.toString(teachers) + ", y=" + y + "}";
}

The strings then will look like

Publisher2{teachers=[], y=20} // for new Publisher(20)
Publisher2{teachers=[Jyostna], y=20} // for new Publisher(20, teachers[1])
Publisher2{teachers=[Jyothi, Jyostna, Sumathi], y=20}
 // for new Publisher(20, teachers)

Upvotes: 0

Elliott Frisch
Elliott Frisch

Reputation: 201409

teachers[1] is the second element in your array. The array itself is just teachers. Like, 

Publisher2 p1 = new Publisher2(teachers, 20);

Upvotes: 2

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