how to print class data members using only object name

Question

class Jatin{
    int value = 9;
    public static void main(String args[]){
        Jatin obj = new Jatin();
        String str = new String("Hello");

        System.out.println(obj);//prints unique id why
        System.out.println(str);//prints string value why
    }
}

How to modify this code and use obj object of class Jatin to print all its data members i.e. print out the value =9. Whereas in String str sop print the value . Why?

You need to write a toString method. Check out the links above. — rghome, Jun 29 '18 at 07:46

Jojo Narte · Answer 1 · 2019-11-01T06:27:47.623

2

You need to create a getter in order to print them, or just access the specific fields directly when you print.

You could also just simply implement/override the toString method if you want a way of printing all members with one call.

For example:

class Jatin {
  String name = "Jatin";
  int value = 9;

  @Override
  public String toString() {
      System.out.println("Name: " + name + "\n" + " value: " + value);
  }
}

Or if you only need a specific value just call on the field.

Jatin obj = new Jatin();
System.out.println(obj.value); // will print the value

The reason why you only get unique hash is because you don't have toString()

edited Nov 01 '19 at 06:27

answered Jun 29 '18 at 07:47

Jojo Narte

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overwrite toString would be the correct terminology – Lino Jun 29 '18 at 07:49
This doesn't compile as `toString()` has to return a `String`. Besides printing the value in the standard output doesn't make part of the `toString()` specification. – davidxxx Jun 29 '18 at 07:50
@Lino hey :) override you mean ! – davidxxx Jun 29 '18 at 07:51
@davidxxx such a simple task. And i completly missed it. Override I meant. Yes :) – Lino Jun 29 '18 at 07:51

score 1 · Answer 2 · answered Jun 29 '18 at 07:47

1

Printing an instance of a class directly returns className@hashcode of that object

If you need to access the attributes of an object, you need to access them using dot operator.

In your case, obj.value i.e System.out.println(obj.value);

answered Jun 29 '18 at 07:47

hsnsd

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how to print class data members using only object name

2 Answers2