Java class String Conversion and toString()

Introduction

Every class should implement toString() method defined by Object.

The toString() method has this general form: 

String toString()

To implement toString(), return a String object with a human-readable string that describes an object of your class. 

// Override toString() for Box class.
class Box {
  double width;//www .  j a v  a2  s.c om
  double height;
  double depth;

  Box(double w, double h, double d) {
    width = w;
    height = h;
    depth = d;
  }

  public String toString() {
    return "Dimensions are " + width + " by " + 
            depth + " by " + height + ".";
  }
}

public class Main {
  public static void main(String args[]) {
    Box b = new Box(10, 12, 14);
    String s = "Box b: " + b; // concatenate Box object

    System.out.println(b); // convert Box to string
    System.out.println(s);
  }
}



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