Java Code Challenge 6 смотреть онлайн

Java Code Challenge - String
Covers concepts around String immutable nature, String pool concept, when String object goes to pool and heap, and how String concatenation works

Github:- https://github.com/kchhipa4u/java-code-challenge

Question 1 :- How many (String + StringBuilder) objects created for the lines written in the main method.

TotalObjectCountChallenge, Explanation and output:-

Total 8 Objects (7 String, 1 String Builder)
String how1 = new String("How "); //1 in heap

String how = "How "; // 1 in String constant pool

String many ="many "; // 1 in String constant pool
String objects = "objects "; // 1 in String constant pool
String are = "are "; //1 in String constant pool
String created = "created"; // 1 in String constant pool

String how2 = new String("How "); // 1 in heap

System.out.println(how+many+objects+are+created); //1 StringBuilder Object, String concatenation operation creates StringBuffer object

Question 2:- StringComparisonChallenge, Explanation and output:-

/*
* First two strings (s1 & s2) are compiled time constants hence they will go to Pool. While the last one will be created on
* heap as s1.length is not compiled time constant so the compiler will leave this to JVM who eventually put this on a heap.
* o/p :-
* true
* false
* false
*/

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Please watch: "Core Java Online Class : JDK vs JRE, Packages "
https://www.youtube.com/watch?v=2ZO8Flga-Fw
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