Learning for the first time java [Introduction]

public class Main {
	public static void main(String[] args) {
		System.out.println("hello, world!");
	}
}

Hello World!

public class Main {
	public static void main(String[] args) {
		System.out.println("hello, world!");

		System.out.println("31+Do 31 calculations");

		System.out.println(31+31);
	}
}

hello, world!
31+Do 31 calculations
62

public class Main {
	public static void main(String[] args) {
	    int x;
	    x = 6;
		System.out.println(x * x * 3.14);
	}
}

113.04

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