Object Equals method

>        System.out.println(m1);
>        System.out.println(m2);

These two lines call toString() to get a string representation of the object to output

This is a good explanation of toString() method and also gives
details on default implementation of toString() for Object:

http://www.javabeginner.com/learn-java/java-tostring-method

equals method does not invoke toString() method. when you are trying to print some object, toString() method gets invoked to print the object.  

>>>

class PointCoordinates {

      private int x, y;
      public PointCoordinates(int x, int y) {
            this.x = x;
            this.y = y;
      }
      public int getX() {
            return x;
      }
      public int getY() {
            return y;
      }
}

public class ToStringDemo {

      public static void main(String args[]) {
            PointCoordinates point = new PointCoordinates(10, 10);
            // using the Default Object.toString() Method
            System.out.println("Object toString() method : " + point);
            // implicitly call toString() on object as part of string concatenation
            String s = point + " testing";
            System.out.println(s);
      }
}

Download ToStringDemo.java

When you run the ToStringDemo program, the output is:
Object toString() method : PointCoordinates@1ad086a
PointCoordinates@1ad086a testing



>>i have gone through the link. I have not understood example and output there. how testing printed at last. please advise.

>             System.out.println(s);

this method calls the String.valueOf() method like this:


        public void println(Object obj) {
           println(String.valueOf(obj));
       }

The valueOf() method then calls toString() to return a string representation


     public static String valueOf(Object value) {
         return value != null ? value.toString() : "null";
     }


Let me know if you have any questions

>>>then compiler will undrstand it
as

Strinng s = p.toString() + " testing';

>>>System.out.println(s);

this method calls the String.valueOf() method like this:


        public void println(Object obj) {
           println(String.valueOf(obj));
       }

The valueOf() method then calls toString() to return a string representation


     public static String valueOf(Object value) {
         return value != null ? value.toString() : "null";
     }


is printing weird

PointCoordinates@1ad086a testing

Why is it not able to print something meaningful for point. please advise

output.

> Why is it not able to print something meaningful for point. please advise

Because PointCoordinates does not have a toString() method