Java

8-Mar-22 15:54

Got it! Thanks Smile | :)

Re: WhiteSpace Character

Victor Nijegorodov8-Mar-22 5:55

Victor Nijegorodov

8-Mar-22 5:55

You are wrong. They all are ASCII characters. But 9,10,13 are not printable, they usually used as the Control characters.

Re: WhiteSpace Character

Craig Robbins8-Mar-22 6:01

Craig Robbins

8-Mar-22 6:01

You can think about what the printer does when it receives each byte. If the value for the byte is to "tab" then no ink is put on the page - hence whitespace. Instead the printer jumps ahead to the next tab position. The tab is an instruction to the printer where to be ready to print next. New Page, New Line, Backspace all are like this too.

If the value is for the letter "A" then this puts ink on the page -- hence it is not whitespace. The "space" character is kind of special in that it prints a "blank" -- the printer's position on the page moves ahead by one character just as if it printed an "A", but of course no ink is put on the page.

Your display can be thought of in the same way as the printer for this discussion.

Java

GJ AVAIYA5-Mar-22 8:51

GJ AVAIYA

5-Mar-22 8:51

Write a java applet program to create multithreads in java using
Runnable interface to do the following on the number taken from user
and set priorities to various threads:
1. One thread display each digit of the inputted number
2. Second thread display reverse of the inputted number
3. Third thread display sum of each digit of the inputted number

Re: Java

Dave Kreskowiak5-Mar-22 11:29

Dave Kreskowiak

5-Mar-22 11:29

And another one that just posts their homework assignment without asking any kind of question.

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

Re: Java

Richard MacCutchan5-Mar-22 22:17

JAVA_REGEX_WHITESPACE _CHARACTER

5-Mar-22 22:17

Please read Forum Guidelines - PLEASE READ - Java Discussion Boards[^]. No one here is going to do your work for you.

Sudhanshu_India1-Mar-22 16:01

1-Mar-22 16:01

I found this on W3 school.But there is no mention about space character.

Whitespace characters can be:

A space character // What is symbol for this?
A tab character // like this has a symbol \t
A carriage return character
A new line character
A vertical tab character
A form feed character

My question is what is the symbol for space character if it is whitespace character?

Richard Deeming1-Mar-22 22:38

Richard Deeming

1-Mar-22 22:38

A space character is literally a single space: " ", ASCII code 32.

Technically, you could encode it as "\u0020". But there's no need to do that, unless you want to deliberately make your code less readable.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Sudhanshu_India2-Mar-22 1:43

2-Mar-22 1:43

You mean space between double quotes " " is symbol for space character?

Richard Deeming2-Mar-22 3:06

Richard Deeming

2-Mar-22 3:06

The character you get when you press the space bar on your keyboard is a space character.

What sort of "symbol" were you expecting to see for it?

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Sudhanshu_India2-Mar-22 15:28

2-Mar-22 15:28

understood.
No, I thought that if \t is used for tab character(which is a whitespace character), then this sort of symbol might be for space character too.
That's why I asked.

thanks, Thumbs Up | :thumbsup:

Richard MacCutchan2-Mar-22 22:39

2-Mar-22 22:39

This, and most other simple questions, can be answered by studying the language: see Characters (The Java™ Tutorials > Learning the Java Language > Numbers and Strings)[^].

Sudhanshu_India3-Mar-22 5:23

3-Mar-22 5:23

thanks for sharing

RedDk3-Mar-22 17:54

RedDk

3-Mar-22 17:54

Get Frhed.

You can download it here:
Frhed - Free hex editor[^]
There's so much going on with character encodings in developing software apps on all platforms that having a handy hex editor at you're disposal, especially if you're confused about which way something is going ... is a really good idea.

Richard Deeming3-Mar-22 22:25

Richard Deeming

3-Mar-22 22:25

There's also the Hex Editor plugin[^] for VSCode[^], in case you need a non-Windows solution, or already have VSCode installed and don't want to install yet another editor. Smile | :)

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Dynamic Polymorphism

Sudhanshu_India24-Feb-22 3:38

24-Feb-22 3:38

In the noted line i have problem.where i am doing error so that i am not getting old address and new address? Rest of the things are showing expected result.
-----------------------------------

Java

public void displayCustomerDetails(Address address) {
		System.out.println("Displaying customer details \n***************************");
		System.out.println("Customer Id : " + customerId); //can also use this.customerid
		System.out.println("Customer Name : " + customerName); //can also use this.customerName
		System.out.println("Contact Number :"+ contactNumber);
		System.out.println("Customer Address : " +this.getAddress());  //Here I want to print old address:confused: 
		
System.out.println();
	}
	
	
	public void updateDetails(Address address) {            //Association
		System.out.println("Updating customer address...");
		this.setAddress(address);
		System.out.println("New Customer Address :"+ " "+this.getAddress() ); //Here i want to print new address:confused:
	}

My Code
--------------

Customer Class
----------------------

Java

public class Customer {
	private String customerId;
	private String customerName;
	private long contactNumber;
	private Address address;        //Aggregation
	public Customer(String customerId, String customerName, long contactNumber, Address address) {   // Constructors and other methods
		this.customerId = customerId;
		this.customerName = customerName;
		this.contactNumber = contactNumber;                            
		this.address = address;
	}
	public String getCustomerId() {
		return customerId;
	}
	public String getCustonerId() {
		return customerId;
	}
	public String getCustomerName() {
		return customerName;
	}
	public void setCustomerName(String customerName) {
		this.customerName = customerName;
	}
	public long getContactNumber() {
		return contactNumber;
	}
	public void setContactNumber(long contactNumber) {
		this.contactNumber = contactNumber;
	}
	public Address getAddress() {
		return address;
	}
	public void setAddress(Address address) {
		this.address = address;
	}
	
	public void displayCustomerDetails(Address address) {
		System.out.println("Displaying customer details \n***************************");
		System.out.println("Customer Id : " + customerId); //can also use this.customerid
		System.out.println("Customer Name : " + customerName); //can also use this.customerName
		System.out.println("Contact Number :"+ contactNumber);
		System.out.println("Customer Address : " +this.getAddress());
		System.out.println();
	}
	
	public void updateDetails(long mobile) {
		System.out.println("Updating customer contact number...");
		this.setContactNumber(mobile);
		System.out.println("New Contact Number:"+ " "+this.getContactNumber());
	}
	public void updateDetails(Address address) {            //Association
		System.out.println("Updating customer address...");
		this.setAddress(address);
		System.out.println("New Customer Address :"+ " "+this.getAddress() );
	}
}

Address Class
----------------------------

Java

public class Address {
public String homeNo;
private String street;
private  String city;
private int pin;

public Address(String homeNo, String street, String city, int pin) {

	this.homeNo = homeNo;
	this.street = street;
	this.city = city;
	this.pin = pin;
}



public String getHomeNo() {
	return homeNo;
}



public String getStreet() {
	return street;
}


public String getCity() {
	return city;
}


public int getPin() {
	return pin;
}

}

Tester Class
---------------------------------

Java

public class Tester {
	public static void main(String[] args) {
		Address custAddress = new Address("D109", "Castle Street", "London", 65436);
		
		Customer customer = new Customer("C1016", "Stephen Abram", 7856341287L,custAddress);
		
		customer.displayCustomerDetails(custAddress );
		Address newAddress = new Address("D119"," St. Louis Street", "Springfield", 62729);	
		
		
		Long newContact = 7890098656L;
		
		
		
		customer.updateDetails(newContact); //calls the updateDetails(long mobile) - based on the parameter
        customer.updateDetails(newAddress); //calls the updateDetails(Address address) - based on the parameter	
       
}
}

output
--------------

Displaying customer details 
***************************
Customer Id : C1016
Customer Name : Stephen Abram
Contact Number :7856341287
Customer Address : Demo1.Address@123a439b    // see here it is not printing actual old address:confused:

Updating customer contact number...
New Contact Number: 7890098656
Updating customer address...
New Customer Address : Demo1.Address@7de26db8   // see it is not printing new address :confused:

modified 3-Mar-22 12:09pm.

Richard MacCutchan24-Feb-22 4:27

24-Feb-22 4:27

What is the question?

Sudhanshu_India24-Feb-22 5:26

24-Feb-22 5:26

I have to print old and new address. where my code is wrong?

Richard MacCutchan24-Feb-22 5:56

24-Feb-22 5:56

You need to provide more details of where you are trying to print these details and what happens. Please edit your original post and add the requested information.

Sudhanshu_India25-Feb-22 1:42

25-Feb-22 1:42

I have edited. please see where i am doing wrong?

Richard MacCutchan25-Feb-22 1:51

25-Feb-22 1:51

In the following lines you have calls to getAddress() ...

Java

System.out.println("Customer Address : " +this.getAddress());

System.out.println("New Customer Address :"+ " "+this.getAddress() );

... But that call returns the Customer.Address object which contains various properties. So when you pass that to the println method the system tries to print it. But since it has no idea how to print an Address object it just prints the class name and its memory address. You need to add a toString method to your Address class that returns the address formatted as a string.

Sudhanshu_India25-Feb-22 2:09

25-Feb-22 2:09

so, we cannot print by just passing values to object of Address class. we must have to use setter method in Address class or toString method. right?

Richard MacCutchan25-Feb-22 2:17

25-Feb-22 2:17

You should always add a toString method to your classes. All classes are ultimately based on the Object class, which has a very simple toString method (as you have seen). So unless you provide a custom version that is what you will get for your own classes. Remember, the Java system cannot guess what properties, or in what format, you want your classes to be printed.

Sudhanshu_India25-Feb-22 2:20