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What is the Java ?: operator called and what does it do?
Not only in Java, this syntax is available within PHP, Objective-C too. In the following link it gives the following explanation, which is quiet good to understand it: A ternary operator is some operation operating on 3 inputs. It's a shortcut for an if-else statement, and is also known as a conditional operator. In Perl/PHP it works as:

in java what does the @ symbol mean? - Stack Overflow
In Java Persistence API you use them to map a Java class with database tables. For example @Table () Used to map the particular Java class to the date base table. @Entity Represents that the class is an entity class. Similarly you can use many annotations to map individual columns, generate ids, generate version, relationships etc.

How do the post increment (i++) and pre increment (++i) operators work ...
How do the post increment (i++) and pre increment (++i) operators work in Java? Asked 15 years, 6 months ago Modified 1 year, 3 months ago Viewed 446k times

java - How to configure port for a Spring Boot application - Stack Overflow
How do I configure the TCP/IP port listened on by a Spring Boot application, so it does not use the default port of 8080.

Proper usage of Java -D command-line parameters
When passing a -D parameter in Java, what is the proper way of writing the command-line and then accessing it from code? For example, I have tried writing something like this...

What does the arrow operator, '->', do in Java? - Stack Overflow
While hunting through some code I came across the arrow operator, what exactly does it do? I thought Java did not have an arrow operator. return (Collection<Car>) CollectionUtils.select(list...

What does the ^ operator do in Java? - Stack Overflow
7 It is the Bitwise xor operator in java which results 1 for different value of bit (ie 1 ^ 0 = 1) and 0 for same value of bit (ie 0 ^ 0 = 0) when a number is written in binary form. ex :- To use your example: The binary representation of 5 is 0101. The binary representation of 4 is 0100.

Setting JAVA_HOME - Stack Overflow
JAVA_HOME if you installed the JDK (Java Development Kit) or JRE_HOME if you installed the JRE (Java Runtime Environment). In the Variable Value field, enter your JDK or JRE installation path . Open Command Prompt as Administrator. Set the value of the Environment variable to your JDK (or JRE) installation path as follows:

Java Versions and Compatibility - Stack Overflow
Java 20 was fully ready for production use. (Java 20 no longer receives updates a few months after the successive version 21 ships.) You said: What is the JDK to Java SE equivalence? Java SE is a set of specifications published by Oracle Corp. Java (and Java SE) is a trademark owned by Oracle Corp. Available for use only with permission by Oracle.

How is the default max Java heap size determined?
130 For Java SE 5: According to Garbage Collector Ergonomics [Oracle]: initial heap size: Larger of 1/64th of the machine's physical memory on the machine or some reasonable minimum. Before J2SE 5.0, the default initial heap size was a reasonable minimum, which varies by platform. You can override this default using the -Xms command-line option.