String 10 « string « Java Data Type Q&A





1. Simple weird String assignment    coderanch.com

Let's dissect this, using the fact that + is left associative if used as a binary operator, and both + and - are also unary operators. +1+- - + - - + + 1+"" === (+1 is the same as 1, applied twice) 1+- - + - - + 1+"" === (+1 is the same as 1) 1+- - + - ...

2. End of the string in java    coderanch.com

3. String Reference - Doubt    coderanch.com

4. not able get a string output    coderanch.com

5. Create a 4GB string?    coderanch.com

You know that characters in Java are Unicode (UTF-16) and take up 16 bits, right? So should your "4 GB" string be two giga-characters? You did say you were putting it in a CLOB in Oracle, so the answer to that question might require finding out whether Oracle is using UTF-16 too, or something else. Although I wouldn't worry too much ...

6. Strings    coderanch.com

== checks for reference equality. String literals are always taken from the String pool and will therefore be equal (==). In your first example you create a brand new String which is of course a different object. That's why == returns false. The moral of the story: always use the equals method when comparing Strings.

7. Assignments on Strings    coderanch.com

8. Need String program    coderanch.com

Okay. Let's go step-by-step. First of all, I don't think any method from the java.lang.String class would readily give you "bgr" from "bangalore" (Somebody correct me if I'm wrong here). There are 2 ways you can achieve this (maybe more, but of the top of my head, I can think of only these 2): 1. Use the substring() method to get ...

9. Creating new Strings    coderanch.com





10. Problem with getResource(String) method    coderanch.com

11. a question on creating string object.    coderanch.com

12. Help with String conversions    coderanch.com

examples are nice, but they don't define the conditions. You need to give explicit rules on when you need to insert a hyphen and when you don't. Once you define the rules, coding is easy. So, what are the rules? is any 't' character followed by a space, followed by a word to be combined? same with 'e' followed by space? ...

13. Help with simple String?    coderanch.com

14. how many objects with new String statemtn    coderanch.com

hello while reading book of sierra for java , i came to read about below statement that String str2 = new String("Hello"); there are two objects created . One on heap , referenced by str2 and one in string pool. After reading , I tried to replicate the same in code, and tried system.out.println(str2==str2.intern()); --as per book statement , one object ...

15. Strings    coderanch.com

class Test2 { public static void main (String args []) { String s1 = "Hello"; String s2= s1; System.out.println(s1 + "equals" + s2 + s1.equals(s2)); System.out.println(s1 + "==" + s2 + (s1 == s2)); s1 = s2; System.out.println(s1 + "==" + s2 + (s1 == s2)); System.out.println("value of s1" + s1); System.out.println("value of s2" + s2); s2= null; System.out.println("value of s1" ...

16. to divide a string    coderanch.com





17. Doubt relating to String    coderanch.com

18. Connection Factory (Connection String)    coderanch.com

Hi guys, please help me I have the following class Vide: package br.com.caelum.tarefas; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class ConnectionFactory { public Connection getConnection() throws SQLException { System.out.println("conectando..."); try { Class.forName("com.mysql.jdbc.Driver"); } catch (ClassNotFoundException e) { throw new SQLException(e); } return DriverManager.getConnection("jdbc:mysql://localhost/fj21", "root", "root"); } } I would like to know if were the login entered wrong insted of ...

19. Filtering string    coderanch.com

Hello fellow ranchers, This is the scenario: I have string: "In this game you play as a young man coming to Leaf Valley to start a farm, there you find the" I have file with list of keywords: play man bolt hula boolean detectWords(String toBeFiltered, File fileOfKeywords); So basically I just want to find out if "any" of the keywords are ...

20. String.class - What member is this ?    coderanch.com

21. The method foo(String) is undefined for the type Bar    coderanch.com

Hi, I am using Eclipse and I created an additional package to the "default" one , named "alex", in the "...\alex\src\" . "default" is in the same directory. In the default package I have a file "Clasa.java": import alex.Print.*; public class Clasa { public static void main(String[] args) { print("Hello world !"); } } In the additional one I have a ...

22. Java adding infinte strings    coderanch.com

This is the code i have and i need to find a way to add the data inputed together so its all one string like the count++ thing where it adds to the count for each input. so if a 'd' then 'f' then '$' is input the it would add them together in the variable "mixTotal = df$"ot sure how ...

23. an API to minified a string ?    coderanch.com

And minification is a bit more than just removing whitespaces. First, only the whitespace that don't effect the functionality of a program is removed -- as removing the whitesppace in a string to be printed does affect the program. Second, comments must also be removed -- as removing carriage returns will chain the comments otherwise. This can get complex if you ...

24. Why String is a final class..?    coderanch.com

25. string question    coderanch.com

In the first case all the strings created before the last statement are became orphan. Since they are not assigned to any variables they are eligible for Garbage Collection. In the second case all the strings are pointing to some variables so, they are not eligible for Garbage Collection. Hope you got the reason why first case is optimum.

26. Scrolling String - Change of Speed    coderanch.com

Hey, I have written a script for my Computer Science 120 course. The only problem is that I don't understand why the first string moves fast, and then the other four do not move as quickly. I thought it had to do with the runner.sleep(time); method, so I threw that into every scrolling statement. However, this didn't solve the problem or ...

27. string[] modification    coderanch.com

I have a hashMap. Its key is some string object, the value is a fixed size string array. Initially I need all the elements in the string[] be null or "" (empty string). Then I want to retrieve a value from a hashmap and modify that string array. Then I want to retrieve the modified string[] which is the value in ...

28. String immutability    coderanch.com

Neelima Mohan wrote:why was String class made final and String made immutable? I have heard answers like better memory mgmt as lot of similar String literals gets formed and its best way is to maintain the String pool. Has security got to do with it? Thanks, Neelima As for why they made it final, the books say that String is used ...

29. String creation    coderanch.com

30. How to make String Class Mutable    coderanch.com

Are the private fields of String part of this documentation? I think not. And that's why Sun is allowed to change them completely, as long as the public and protected members do not change. Anything not documented (i.e. not in the API) should be considered as a black box and no assumptions should be made about them. That includes Sun's classes ...

31. I compared two Strings with == and it worked????    coderanch.com

Hello everybody. So i've been learning java for a few months and i quickly found out when you try to compare Strings with == it doesn't work, and that to compare objects you have to use the .equals() method. However I have just started learning about GUIs and actionListeners and i wrote a program and accidentally tried to compare two strings ...

32. Running syntax stored in String    coderanch.com

I'm still not sure I understand exactly what you're doing, but as a start you could use a Map or better yet Map> and look up the values by the String name: Map> edges = initializeMap(); String edgeName = "AB"; List values = edges.get(edgeName); Double weight = values.get(index); Although I'm not really sure that String's are what you ...

33. How to put '&' in request query string    coderanch.com

34. Using String... instead of String[]    coderanch.com

35. No. of String Objects    coderanch.com

I don't remeber where do I read that during String initialization which involves concatenating what really happens (internally) is that a StringBuffer is created, then the append method is used to add each String and finally it's toString method is invoked. According to that, the answer to your question would be: 1. Only one String object is created.

36. identify data type in string?    coderanch.com

37. Why String methods and class both are final?    coderanch.com

santhosh.R gowda wrote:Dear All As we know if we make class final the class cant be extend by another class so my question is if we make class final what is the use of making methods final even though we cant override that method because we cant extending the class so why in java API String methods are final Sorry to ...

38. String    coderanch.com

39. Awkward query on String    coderanch.com

Every reference variable has a Class object associated with it. The compiler can verify that all your reference variables are the correct type by querying the details in the classes; those allow it to check the inheritance of your objects and whether it matches the inheritance of the type of variable you are using.

40. This method must return a result of type String    coderanch.com

Please help to fix the following error. Exception in thread "main" java.lang.Error: Unresolved compilation problem: This method must return a result of type String at ReadIniFile.getCode(ReadIniFile.java:8) at ReadIniFile.main(ReadIniFile.java:43) import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.FileNotFoundException; import java.io.IOException; public class ReadIniFile { public String getCode(String filename) { File file = new File(filename); BufferedReader reader = null; try { reader = new ...

41. How can we create our own String class in java?    coderanch.com

James Elsey wrote:Not sure how you'd create a String-a-like, anyone have any ideas? Possibly do something with character arrays Bingo. That's exactly how java.lang.String (currently) does it. It has three fields for this: - a char[] to store the characters - an int that marks the index in the array of the first character - an int that marks ...

42. String    coderanch.com

43. New String    coderanch.com

String a = "a"; String a = new String("a"); In both cases the literal value "a" is a compile-time constant that will end up in the String contant pool. At runtime the former will always refer to the String object in the constant pool, so you don't end up with lots of String objects that represent the same value. The latter ...

44. Factoring out strings    coderanch.com

Hi, I am trying to factor out strings in my java code. I am using the Eclipse SDK (Galileo) 3.5.2 Version. I tried using the "Externalize Strings" widget of Eclipse. But, I am not getting the expected results. Before Externalizing: package org.libx.libappdatabase; public class StringExternalize { public StringExternalize () { String abc = "abc"; String xyz = "xyz"; } } After ...

45. Execute java statement stored in string    coderanch.com

46. Strings    coderanch.com

Hi.. One can loop through the string by converting is to a character array. One can check the ASCII value of the character, if ASCII doesn't satisfy our requirement we can change that character to the desired char(b). For this a method can be created which will have the string(need to be modified) and the highest alphabet (ASCII or char) as ...

47. String    coderanch.com

48. String manipulattion    coderanch.com

to : Henry Wong Sir, Thank you for the response. 1.Here is the file sample "santabanta mobile home

" 2. I want all the words find from this except the followings 2.1 tag names like ...

49. Problem: String != String    coderanch.com

50. String coder    coderanch.com

51. How many String objects created    coderanch.com

Hi I am having a doubt in my mind regarding String objects. Its like : String s = "ABC" + "DEF" + "GNH" + "HNG"; I want to know how many String objects are created in this case. 4 are there no doubtedly. My doubt is whether all the concatenation takes place in a single go (i.e 5 objects) or its ...

52. How to continously key in elements of a String[ ]    coderanch.com

Hey there, Here's a snippet of my code. 1)I am trying to assign the value "(votes + " : " + Str2)" as an element of the String[] Results at the end of my for loop. So at the end of every loop, there is a new entry made to String[] Results. I am not sure whether it has gotta do ...

53. Objects from a String representation of an object    coderanch.com

Dear Friends, Is there any to convert an string representation of an object to object? For example, I have a class called TestObject and while storing it into a flat file using dataoutputstream, I am storing it as TestObject.toString(). So when i read it back I want to convert the String into a TestObject? Is this possible. Please advice. PS: I ...

54. String Tokens    coderanch.com

Hi Fred, This is my scenerio I am a reading a file and separated as tokens,and then i added that tokens into list,now i need separated tokens in my list on iterate.. Here i am attaching my code.. public void beginUploadFile() { String METHOD_NAME = "beginUploadFile"; log.entering(METHOD_NAME, CLASS_NAME); //boolean insertFlag = true; try { readFiles(); // displayArrayList(); System.out.println("The size of StoreValues ...

55. String in java    coderanch.com

Hi All, i had a question which was asked in an interview to analyse my problem solving ability. Snippet: String a ="abcba"; Based on the occurance of the alphabets it should append the appropriate numbers before the alphabets. So String a ="abcba" should be replaced by "2a2bc". Please suggest a snippet which will return the result for me. Thanks in advance ...

56. Using a method to return different string depending on situation    coderanch.com

So far there is a video class that contains a method to check in a movie public void videoCheckIn(String title) { LinkedListNode

57. Illegal initializer for java.lang.String    coderanch.com

public class Phrase{ public static void main(String[] args){ String wordListOne={"Dave","Nick","Paul","Mark","John","Bill","Gil"}; String wordListTwo={"is","was","isNot","wasNot"}; String wordListThree={"a good boy","a good student","a good worker","a good thinker", "a good teacher"}; int length1 = wordListOne.length(); int length2 = wordListTwo.length(); int length3 = wordListThree.length(); int rand1 = (int) (Math.random() * length1); int rand2 = (int) (Math.random() * length2); int rand3 = (int) (Math.random() * length3); String finalPhrase = ...

58. Custom Strings    coderanch.com

59. how to increment suufix of this string?    coderanch.com

Hi, I have a table in sqlite. That table contains 2 column - 1. RoomID and 2. RoomName. What I want is if user enter roomname which is already exist then in database it is already entered as another roomname. suppose in table I have roomname as 1.Hall 2.Bedroom 3.Kithchen and now suppose user enter roomname as Hall again then it ...

60. Sum of digits in alphanumeric string    coderanch.com

"Best" in terms of what - speed, memory, code complexity? Your question is meaningless without better defining what is most important. Much of software design is a balance in the above mentioned items. If two people each think a different thing is the more important one, then their "best" solution will be vastly different. And if you want a 'solution which ...

61. Serilization issue in string object ?    coderanch.com

Hi All, I am using serialzation using java but my saved object is in ASCII code, why so ? import java.io.*; class PersonDetails implements Serializable { private String name; private int age; public PersonDetails(String name, int age) { this.name = name; this.age = age; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } ...

62. About String Class    coderanch.com

Dear All, I have some confussion about String class, as we know that we can make object of String class by two ways:- String str = new String("ABC"); AND String str = "ABC"; Why we cant make other class like ArrayList or LinkedList object like String Class, Why this (String str = "ABC";) type of benefit given to String Class in ...

63. understanding String operation    coderanch.com

64. Dependency between String and Object class in Java    coderanch.com

Just came this question into my mind. As Object is superclass of all classes in Java, so is the superclass of String class. But Object Class has toString method in it which has return type of "String" (its child class). And String is the class with Object as parent class. So how this circular dependeny got managed at the time of ...

65. String formate    coderanch.com

66. Need proof for Modifying a String Object will result in creation of a new Object under Heap    coderanch.com

String objects are immutable - there is no way to modify a String object. The way you phrased the question is incorrect. All methods in class String that do something with the content of the string, do not modify the original string - instead, they return a new String object that contains the modified content of the original string. To prove ...

67. How to know if string is UTF-8 encoded?    coderanch.com

Hello All, I have an instance in my application. Where I need to get one parameter from URL. There is possibility that whatever I get as string can be encoded or can be not encoded. And if its encoded I have to decode it before using. Can anybody please suggest me the way by which we can identify if particular string ...

68. String    coderanch.com

Whenever dealing with items in memory I find it is always easier to draw a picture. So after the line String s = "456"; there is some area in memory that now looks like this, with the reference variable S "referring" to some string object in memor |S| -------> |"456"| so all the line s = "1"; does is creates a ...

69. Scanning/Storing a String that the user enters?    coderanch.com

Hello everyone, I am completely new to java and have some experience with C programming. I am trying to prompt the user for a filename that I am going to read from. More specifically, I am trying to STORE the filename that the user enters in a String Variable, and then read from the filename using that String Variable. Any help ...

70. string UTF8    coderanch.com

integers on modern binary computers handle negative numbers as "2's complement"; you create a 2's complement by reversing all the bits and adding one. so 39 (decimal) is 27 (hex) is 0010 0111 binary. reverse all the digits to get 1101 1000 and add one to get 1101 1001 So 11011001 represents -39 using standard 2's complement binary representation. rc

71. Strings and garbage collection    coderanch.com

72. String help!    coderanch.com

Alright so I just began taking a class learning about entry level java programming, and so far decently good but I have run into a problem writing a homework program. In my head this program seems to work. However in eclipse it keeps telling that i can't convert this char to a string. I have to follow these instructions: copySubsequence(): this ...

73. ByteOutputStream to string ?    coderanch.com

A ByteArrayOutputStream is an OutputStream that stores whatever you write to it in a buffer in memory (rather than for example in a file, such as FileOutputStream does). You can get the content of the buffer by calling toByteArray() on it. If the bytes represent text, then you can make a String out of it. ByteArrayOutputStream out = ...; byte[] data ...

74. String return form method    coderanch.com

75. Playing with a string - need suggestions.    coderanch.com

not sure about the efficiency of the code, but the efficiency of someone reading your code goes down. Most coders can glance at Wouter's version and know exactly what it's doing. When I saw your version, I had to study it for a little bit to understand what you were really doing. So any possible efficiency gained is lost a thousandfold ...

76. String Operations    coderanch.com

77. Confusion about string objects    coderanch.com

78. Strings    coderanch.com

79. Confusing String Class    coderanch.com

55 /** 56 * An PrintStream used for System.out which performs the correct character 57 * conversion for the console, since the console may use a different 58 * conversion than the default file.encoding. 59 */ 60 static class ConsolePrintStream extends java.io.PrintStream { 61 private static String charset; 62 63 static { 64 charset = AccessController.doPrivileged(new PriviAction( 65 "console.encoding", "ISO8859_1")); //$NON-NLS-1$ ...

80. String    coderanch.com

81. The method isEmpty() is undefined for the type String    coderanch.com

Hi, I'm developing a simple login form using jsp and a servlet which performs some basic validation/authentication prior to redirecting to the home.jsp page. I am having issues and have stripped the servlet right back to basics but am still getting the same error message: The method isEmpty() is undefined for the type String I know that this exception is caused ...

82. String questions    coderanch.com

83. Adding strings together    coderanch.com

I would use && instead of &. Logically it means the same (only execute the body if both are true) but & will always evaluate both operands, whereas && will ignore the second if the first one is already false. An example: String s = null; if (s != null && s.length() > 0) // s != null returns false so ...

84. Query string question    coderanch.com

Here is the sequence.. 1. Query string is http....\servlet1?param1=test 2. In servlet1, I store param1 using httpsession, then displays param1 in jsp1(no issues) using Requestdispatcher. 3. Jsp1 uses form action = servlet2, in servlet2 when I issue.. GISAddress gisaddress = (GISAddress) request.getAttribute("gisaddress"); gisaddress.getParam1(); it is null. I used the same GISAddress in jsp1 and it is working, somehow GISAddress is gettting ...

85. plotting String on a graph    coderanch.com

Hi, I'm trying to plot a String of names on a graph using a .tsv file, but I'm having a problem with my for loop. I first plotted the numbers- each number refers to the city (col 0)- this is the code. for (int row = 0; row < rowCount; row++) { if (nos[row] % noInterval == 0) { float x ...

86. Doubt on String Comparisson    coderanch.com

1) A 'Hashcode' is basically a number you calculate. The idea is that you use a formula that will give you distinct values for objects that are 'different', according to your definition of 'different'. So for strings, you would most likely use the content of the string somewhere in your calculation so that "hello" would return a different value than "goodbye". ...

87. Shuffle a string    coderanch.com

Can you please tell me how can I shuffle a string?Actualy i want to shufle a string that was splited with tokenizer?Like in a sentence i want to split it into words and after that shuffle each words,and after that reattach the shuffeld words into a sentence.Please give me an example. Thanks!

88. String object creation    coderanch.com

There are two ways to create a String object 1) String s="hello" 2) String s=new String("hello") if we use 2) case it creates one extra object(using new)other than string literal "hello" which is the case with 1).. so why we have to go for case 2) when we know it creates an extra object? Is there any scenario where case 2) ...

89. Why two types of String creation.    coderanch.com

90. sending string using writeUTF    coderanch.com

91. String immutability    coderanch.com

A String is immutable.When I am using following code, value of static String sName is not changing public class StringTest extends Thread{ static String sName = "good"; public static void main(String argv[]){ StringTest t = new StringTest(); t.nameTest(sName); System.out.println(sName); } public void nameTest(String sName){ sName = sName + " idea "; //start(); } public void run(){ for(int i=0;i < 4; i++){ ...

92. String Unscrambler issues (Self-Resolved)    coderanch.com

public class Finder{ private static String word1 = "program"; private static String [] listOfWords= new String [] { "this", "is", "the", "list", "of", "words", "my", "program", "will", "be", "looking", "at"}; public static void main(String args[]) { permuteString("", word1); //wordField.getText().toLowerCase().trim() } public static void permuteString(String beginningString, String endingString) { if (endingString.length() <= 1) {check(beginningString, endingString);} else for (int i = 0; i ...

93. How to use the string formatter method    coderanch.com

Hi all, does anyone know of a good online resource that simply and definitevly explains how to use the string formatter method...? I need to write a series of "records" into a set ascii text files. I need to "delimit" each "record" with a cr-lf sequence in a windows 2008 server environment. Therefore I'm trying to figure out how to add ...

94. String classes    coderanch.com

because s is not a string. it is a REFERENCE to a string. The String object "hello" still exists unchanged, but you no longer have a reference variable pointing to it. It is similar to having an address card that points to a house. you can change the address written down on the card, but the original house is unchanged.

95. Does both refer to same String or not?    coderanch.com

96. String modification    coderanch.com

97. String assignment from method    coderanch.com

Hey all, I get a return int value from my method. How do I set the value to a string character? My string character would change depending on the random int value generated. I think I should be using an array, but I had problem setting a int to a String. please help, thanks import acm.program.*; import acm.util.*; public void run(){ ...

98. Please, I need a help with a String issue    coderanch.com

Hi all, I have a strange problem with Strings and I cannot understand why. I suspect variable scope but since I am not sure, I am posting here for help. I have a class method that must return a double dimensional String array. The variable I want to return is named "dataToReturn". The method works fine according to its task. I ...

99. garbage collection for String    coderanch.com

100. Iterating through a String.    coderanch.com

James Sabre wrote:All I see as a requirement is that two strings be searched for a possible common third string. What am I missing? I was missing the other thread. It looks to me like the Ankit needs to check every rule against every message and if he re-opened the file used in the inner loop this would seem to work ...