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Thread: How to print out class parameters properly

  1. #1
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    Default How to print out class parameters properly

    I'm trying to get a cloneable interface to work. Here's what I have so far:

    Driver.java
    package interfaces.business;
     
    import java.util.Scanner;
    import java.time.*;
     
    public class Driver implements Cloneable{
     
    	private int DriverID;
    	private String firstName;
    	private String lastName;
     
    	public Driver(int DriverID, String firstName, String lastName) {
    		this.DriverID = DriverID;
    		this.firstName = firstName;
    		this.lastName = lastName;
    	}
     
    	public void setDriverID(int DriverID) {
    		this.DriverID = DriverID;
    	}
    	public int getDriverID() {
    		return DriverID;
    	}
     
    	public void setFirstName(String firstName) {
    		this.firstName = firstName;
    	}
    	public String getFirstName() {
    		return firstName;
    	}
     
    	public void setLastName(String lastName) {
    		this.lastName = lastName;
    	}
    	public String getLastName() {
    		return lastName;
    	}
     
    	//To make the clone() method available to all classes (instead of just having protected access),
    	//you can override the clone() method of the Object class with a clone() method that has public
    	//access:
    	@Override
    	public Object clone() throws CloneNotSupportedException{
    		return super.clone();
    	}	
    }

    CloneInterface.java
    package interfaces.ui;
     
    import interfaces.business.Driver;
     
    public class CloneInterface implements Cloneable{
     
    	public static void main(String[] args) {
    		try {
    			System.out.println("The main method from the CloneInterface class is being used.");
    			System.out.println();
    			Driver z = new Driver(5580,"Sam","Peterson");		
    			z.setDriverID(5580);
    			z.setFirstName("Sam");
    			z.setLastName("Peterson");
     
    			//clone the object
    			Driver z2 = (Driver) z.clone();
     
    			//change a value of the cloned object
    			z2.setDriverID(8888);
     
    			//print the results
    			System.out.println(z);
    			System.out.println(z2);
    		}catch (CloneNotSupportedException ex) {
    			System.out.println(ex);
    		}
    	}
    }

    I was expecting the output to look something like this:

    5580, Sam, Peterson
    8888, Sam, Peterson


    But instead, I got something like this:

    interfaces.business.Driver@15db9742
    interfaces.business.Driver@6d06d69c


    What happened, and how do I fix it?

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: How to print out class parameters properly

    I got something like this:

    interfaces.business.Driver@15db9742
    interfaces.business.Driver@6d06d69c


    What happened, and how do I fix it?
    Those are the Strings returned by the Object class's default toString method. If you want to see something different override the class's toString method and have it return the desired Strings.
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following 2 Users Say Thank You to Norm For This Useful Post:

    AudacityPlugin (August 29th, 2019), SamJava_the_Hut (June 13th, 2019)

  4. #3
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    Default Re: How to print out class parameters properly

    Thanks for the answer norm.
    I have been experiencing the same issue (i have just started with java) and i was driving crazy

    Thaks a lot!

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