Hello World in Java 25

A classic introduction program when learning or testing out a new language. In this case Java version 25. Let’s see a simple Hello World program.

We will write a program that when it runs, simply outputs a “Hello World” message on the screen/ console.

Main.java

				
					void main() {
   IO.println("Hello World!");
}

				
					java Hello25.java

Note Make sure Java version 25 is set in the terminal e.g. by sdkman

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

Note In Java 25, we can simply invoke java on the class file. No need to run javac first to compile and then java on the class file.

Let’s ask the user to enter their name. We can do it simply by using the IO.readln() method as follows:

Main.java

				
					void main() {
   var name = IO.readln("What is your name?");
   IO.print("Hello ");
   IO.println(name);
}

				
					java Main.java

If we wish to use program arguments, we can simply write the parameter in the main method as follows:

Main.java

				
					void main(String[] args) {
}

And then use them in our code. For example, doing a for loop to print their values.

Main.java

				
					void main(String[] args) {
   IO.println("Program arguments:");
   for(String arg : args) {
       IO.println(arg);
   }
}

				
					java Main.java argument1 argument2 etc

In this post we saw how to write a Hello World in Java 25 and also how to prompt the user to type their name.

References:

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