https://github.com/semusings/in-5-minutes

In 5 Minutes
https://github.com/semusings/in-5-minutes

Last synced: 3 days ago
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In 5 Minutes

• Host: GitHub
• URL: https://github.com/semusings/in-5-minutes
• Owner: semusings
• License: apache-2.0
• Created: 2024-05-04T02:25:19.000Z (7 months ago)
• Default Branch: main
• Last Pushed: 2024-05-04T04:03:05.000Z (7 months ago)
• Last Synced: 2024-05-05T03:25:00.141Z (7 months ago)
• Language: Java
• Homepage: https://semusings.github.io/in-5-minutes/
• Size: 87.9 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

        
---

marp: true

theme: your-theme

paginate: true

header: '© Software Engineering Musings -  - subscribe us on '

---

 section { overflow: auto; display: block; width: 100%; height: 100%; } 

# Unnamed Classes and Instance Main Methods

**JEP-445**

-  Ever found Java's "Hello, World!" program a bit too complex?

- Java's complexity can be daunting for beginners.

- No more unnecessary clutter in simple programs.

---

## Classic Approach

Classic Hello, World! program that is often used as the first program for Java students:

```java

public class HelloWorld { 

    static String greeting = "Hello, World!";

    public static void main(String[] args) {

        System.out.println(String.format(":%s\n:%s\n:%s", HelloWorld.class.getName(), greeting,

                "Subscribe us on youtube.com/@semusings"));        

    }

}

```

```bash

java --source 22 --enable-preview HelloWorld.java

```

In this approach -> too much code, too many concepts, too many constructs 

---

## Mordern Approach

Allow to lunch instance main methods. Such methods are not static, need not be public, and need not have a String[] parameter. 

```java

class HelloWorldUsingInstanceMethod {

    String greeting = "Hello, World!";

    void main() {

        System.out.println(String.format(":%s\n:%s\n:%s", getClass().getName(), greeting,

                "Subscribe us on youtube.com/@semusings"));

    }

}

```

```bash

java --source 22 --enable-preview HelloWorldUsingInstanceMethod.java

```

---

## Mordern Approach (contd.)

Unnamed classes to make the class declaration implicit

```java

String greeting = "Hello, World!";

void main() {

    System.out.println(String.format(":%s\n:%s\n:%s", getClass().getName(), greeting,

            "Subscribe us on youtube.com/@semusings"));

}

```

```bash

java --source 22 --enable-preview HelloWorldUsingUnnamedClass.java

```

---

## Thank You!

> Please feel free to reach out to me if you have any question.

>

> [email protected]

 

 

Subscribe us on YouTube 

---

### References

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