string-pool

I have been reading Java String object and I had this question - String x="a"; String y="b"; Does it create two objects in Java? aioobe Those two lines of code will not create any objects. String literals such as "a" are put in the string pool and made available upon class loading. If you do String x = new String("a"); String y = new String("b"); two objects will be created in runtime. These questions/answers should cover follow-up questions: Questions about Java's String pool How many Java objects are generated by this - new String("abcd") When ever a String is initialized using new operator

This question already has an answer here: How does String.intern() work and how does it affect the String pool? 1 answer String s1 = "Hello".concat("World"); String s3 = new String("HelloWorld"); //Line-2 String s2 = s1.intern(); System.out.println(s1 == s2); //false System.out.println(s1 == s3); //false System.out.println(s2 == s3); //false If I removed Line-2 and compare s1==s2, it will return true. Could anyone explain me what exactly happens in string pool after Line-2? And whats happening in each line in heap and in constant pool ? From what i understand s1 will create "HelloWorld" in

This question already has an answer here: When does python choose to intern a string [duplicate] 3 answers After seeing this question and its duplicate a question still remained for me. I get what is and == do and why if I run a = "ab" b = "ab" a == b I get True . The question here would be WHY this happens: a = "ab" b = "ab" a is b # Returns True So I did my research and I found this . The answer says Python interpreter uses string pooling. So if it sees that two strings are the same, it assigns the same id to the new one for optimization. Until here everything is alright and answered. My

Is there any way to check, currently which Strings are there in the String pool. Can I programmatically list all Strings exist in pool? or Any IDE already have this kind of plugins ? You are not able to access the string pool from Java code, at least not in the HotSpot implementation of Java VM. String pool in Java is implemented using string interning . According to JLS §3.10.5 : a string literal always refers to the same instance of class String . This is because string literals - or, more generally, strings that are the values of constant expressions (§15.28) - are "interned" so as to share

This question already has an answer here: Is a Java string really immutable? 15 answers Java string pool coupled with reflection can produce some unimaginable result in Java: import java.lang.reflect.Field; class MessingWithString { public static void main (String[] args) { String str = "Mario"; toLuigi(str); System.out.println(str + " " + "Mario"); } public static void toLuigi(String original) { try { Field stringValue = String.class.getDeclaredField("value"); stringValue.setAccessible(true); stringValue.set(original, "Luigi".toCharArray()); } catch (Exception ex) { // Ignore exceptions } } }

This question already has an answer here: What is the difference between “text” and new String(“text”)? 11 answers Several ways of creating string are shown below. Questions are added following the expressions in the way of comments. String str = "test"; String str1 = new String(str); //Will it invoke the Constructor of String(String)? String str2 = new String("test");//Will it invoke the Constructor of String(String)? String str3 = str; //Which Constructor will it invoke? Or str3 only reference to str and "test" without being constructed? String str4 = "test";//Which Constructor will it

I am preparing for the OCA SE 7 exam, and some of these questions are really (!) tricky. In one of the books Im using I found an error I think, so I would like to confirm the following please... public static void main(String... args) { String autumn = new String("autumn"); // line one System.out.println("autumn" == "summer"); // line two } After the println method executes, how many String objects are there in the pool? It is my understanding that: - line one does not add the string to the pool - line two creates "autumn" and "summer" and adds them to the pool So the correct answer in the

Beware: I'm not trying to compare if the characters are equals. Because I know how to use the String.equals() method. This question is about String reference I was studying for the OCA exam when I started to learn about the class String and it properties as immutability, etc. According to what I read or may understand about String pool is that when a string is created Java stores this object on what they call String pool and if a new string is created with the same value it is going to make reference to the string on the String pool except is the case we use the new keyword as this creates a