toString 3 « toString « Java Class Q&A

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Java Class Q&A » toString » toString 3 

1. using toString?

2. Exact Difference and Usage between .toString / String.valueOf() / (String)

x.toString() calls the object's toString() method. It cannot be used for primitives, and it will give NullPointerException if x is null. String.valueOf(x) will call the object's toString() method if x is a non-null reference. If x is a null reference, it will return the string "null". If x is a primitive, it will return a String representation of that primitive, probably ...

4. String toString not working correctly. Not sure if my getResults method is

toString works just fine. If you don't override it, you'll get Object's version, which returns the classname and either hashCode or identityHashCode. Since arrays don't override toString, you're getting something that simply tells you it's an array of int plus its hashCode. You can either call Arrays.toString(that array) or write code to iterate over it and build up a string.

5. Display "optional" methods toString

6. StringBuilder.tostring memory

I have a file of 150 MB, parsing it and storing it in a StringBuilder. The memory used by StringBuilder is 300 MB. Now I want a String object out of this StringBuilder, so using the toString() method. But this method creates a new String object that again takes 300 MB. So reading a 150 MB file requires total of 600 ...

7. toString meathod help in a class and arrys

8. Null pointer exception in toString!

Hi all, i am getting null pointer exception in toString method.Might be due to threads.Can i synchronize toString? The code snippent is as follows : @Override public String toString () { if (mSourceInfo != null) { return "Source [Name=" + + ", Description=" + mSourceInfo.description + ", Type=" + mSourceInfo.type + ", Path=" + ", Online=" + + ", ...

9. char[].toString() vs new String(char[]) - please explain

Phil_The_Lifeless_Programmer wrote: The second one, but it doesn't help me to understand why. Right. So why not ask that?? Anyways, the toString method doesn't just magically work out what you want from it, all it does is return a string that "represents" the object you call it on. Unfortunately, "represents" is very vague. All arrays are instances of a generated "array" ...

10. Double.valueOf(Float) and Double.valueOf(Float.toString(float)) return diff

Hi, For a given float value of 0.5, the following two statements give me different results solver.calculateObjective() returns 0.5 stmt 1.Double.valueOf(solver.calculateObjective()); This returns a value of 0.05000000074505806 stmt 2 Double.valueOf(Float.toString(solver.calculateObjective())); This returns a value of 0.05 I am not able to figure out the reason for this. Will appreicate any help on this... -Deepak

11. TimeZone toString Info

Here's what calling toString on a java.util.TimeZone object (set to use the Europe/Brussels ID) looks like (formatted by me for easier reading): sun.util.calendar.ZoneInfo[ id="Europe/Brussels", offset=3600000, dstSavings=3600000 useDaylight=true, transitions=184, lastRule=java.util.SimpleTimeZone[id=Europe/Brussels, offset=3600000, dstSavings=3600000, useDaylight=true, startYear=0, startMode=2, startMonth=2, startDay=-1, startDayOfWeek=1, startTime=3600000, startTimeMode=2, endMode=2, endMonth=9, endDay=-1, endDayOfWeek=1, endTime=3600000, endTimeMode=2]] How do I read this? I can't find documentation for this in the javadoc or in ...

12. toString question/problem

It should be noted that the stated purpose of the toString() method is debugging, and what you get back from it may not be what you had expected. If you want a string representation of complex data I suggest that you create an alternate method such as formatToString() or whatever you care to call it. PS.

13. Need help with toString() method

int choice; double result=0, dollars, rate=0.0; String country = " "; NumberFormat dollarForm = NumberFormat. getCurrencyInstance(); public void get() { Scanner keyboard = new Scanner (; System.out.println("1. U.S. to Canada"); System.out.println("2. U.S. to Mexico"); System.out.println("3. U.S. to Japan"); System.out.println("4. U.S. to Euro"); System.out.println("0. Quit\n"); System.out.print("\nPlease enter your choice:"); choice = keyboard.nextInt(); if (choice >= 1 && choice <= 4) {

14. problems with Integer.toString(0

All, I am converting from int to String, and place those Strings into my PreparedStatement, ? ? ? . When I use setString(1, "String") works fine. When I try using setString(1, Integer.toString(integer) does not work. If the integer day = 5, Integer.toString(day) produces a 9, not 5 like it should. I see that I have to specifically enter a String for ...

15. toString()

The thing that you probably never would describe private attributes from a superclass, so in your example you wouldn't be able to access them from the extending class. Now if you have made them protected or provided protected getter methods, you would be able to access them from the Bird. toString() is really only a convenience method to get a printable ...

16. .toString()

It's a .txt file because i don't think you can read in word documents. I just don't understand why it reads in my words but then adds like 200 white spaces to the end. I do parse the data but right now I'm just trying to read it in and write it back out Message was edited by: Apple_sauce

17. toString()

import java.util.*; import*; public class Samp { public static void main(String args[])throws IOException { BufferedReader br=new BufferedReader(new InputStreamReader(; int n=0; try{ System.out.println("Enter the Number of records :"); n=Integer.parseInt(br.readLine()); ArrayList al=new ArrayList(); for(int i=0;i

18. why buffer.toString does not accept new line in it??

You're not making any sense. The file will have exactly the characters you put into it. Nothing more, nothing less. How those characters get displayed is purely a function of the editor or viewer you use, and has nothing to do with Java. The only thing you can do with Java is decide which characters to put into the file. Whatever ...

19. toString, indexOf search not working correctly, I'm depserate now :(

that it is! however, i've been looking at it for 3hrs and i even sent it to my turor who had no idea...when i told her what it was she called herself several kinds of idiot for not seeing it. That's what i hate about messy code. I'm glad there's the -1 value, otherwise i'd start pulling hair out. I do ...

20. jTextField1.toString() has no "text="

Instances of JButton, JLabel and JTextField all have a getText() method. However, the following produces strings containing the text for JButton and JLabel, but not for JTextField (see below). Why would that be? There are occasions when it would be useful to check what the text was, for example when using event.getComponent().toString(), but it is not there for JTextField. System.out.println("" + ...

21. toString Abstract class variables

22. toString !!

23. toString()

Sorry, i posted something like this yesterday but i couldn't find it for some reason. I still havn't figured out my problem. I need to create a toString() method to print the contents of an array of integers. How do I go about this? I've searched through similar posts but havn't really found anything helpful. Thank you!

24. Why can't I do this? toString() question.

25. using a toString() method to round decimals

I've been working on this project for school, building a class which models cartesian coordinates and can also convert them to polar coordinates. After much work I have a working product with some time to spare. Theres a small amount of extra credit to be gained if i can use toString() methods to manipulate my results to be exactly to two ...

26. toString problem

27. ToString

First, you need to clearly describe exactly what you want to happen and exactly what is happening instead. Basically all you've done here it post a tiny bit of code and say "it doesn't work." We can't read your mind. Second. never use == or != to compare String contents. Use the equals() method.

28. toString()

cnelsen1 wrote: The problem is that str is defined as a char which is a primitive data type, why it has a toString() method I have no idea, but it seems to return something more akin to address information rather than data information. No, that's not the problem. str is not a primitive char. str is an array of primitive char. ...

29. Problems with toString()

30. toString

If my simple toString() method ends with: return iData; (where the variable is an int), should that not compile normally even though the return type of toString() is String? Every example I see from my searches show that ints and other primatives can be returned i.e. return "Some string" + 45 + "Another string"; or return 45; When I try to ...  | Contact Us | Privacy Policy
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