Booleans
Create a true/false variable and print it.
1public static void main(String[] args) {
2 boolean isFalse = false;
3 System.out.println(isFalse);
4}
$ javac Main.java
$ java Main
false
Every line, explained
public static void main(String[] args) {- Every Java program starts at the main method. When you run the program, Java looks for this exact line, public static void main(String[] args), and runs everything between its { and } from top to bottom.
boolean isFalse = false;- boolean declares a variable that can store only one of two values: true or false. Watch the spelling: in Java the type is boolean; writing bool (like some other languages use) will not compile.
System.out.println(isFalse);- System.out.println(...) prints whatever is inside the parentheses to the terminal, then moves to a new line. Read the name carefully: print-l-n is short for "print line". Printing a boolean shows the word true or false.
}- This closing curly brace } ends the main method. In Java every opening brace { must have a matching closing brace }.