Conceptual & Tricky Interview Question on String in JAVA | Important Q/A for 2019 Java Developer

Conceptual & Tricky Interview Question on String in JAVA | Important Q/A for 2019 Java Developer

String s1 = "TechTalk";
String s2 = "TechTalk";

How many Objects will be created in Java ?
In this case one Objects will be created, as we are creating String with the help of String Literals.
So Both content is same and JVM will not create same String in the "String constant pool".
JVM will return same reference to the next variable , here S2. hence only one Object will be created.
Please note: if we change the word case from small to upper, then two objects will be creaed , as it is a case sensitive.


String s1 =new ("TechTalk");
String s2 =new ("TechTalk");

In that case two objects will be created, as it will create on heap area and it's does not depend on the content of the Object.

public class TrickyQuestionOnString {

public static void main(String[] args) {

String s1 = "TechTalk";
String s2 = "TechTalk";
System.out.println(s1 == s2);


// We can check the different object with this value
System.out.println(s1.hashCode());
System.out.println(s2.hashCode());

String s3 = "Techtalk";

System.out.println(s3 == s1);

String s4 = new String("TechTalk");
String s5 = new String("TechTalk");

// We can check the different object with this value
System.out.println(s4.hashCode());
System.out.println(s5.hashCode());
}

}
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