Q&A for How to Call a Method in Java

You create objects by invoking the constructor of their class (it has the same name as the class). Java already has some classes; for example, Integer, but you can also define your own class. For example, if you defined a class Orange, you could create an object of that class like this: "Orange o = new Orange();".

The main is what runs first, so make sure you call the second method from inside the main { }, and it will execute by itself.

A method is a set of code that is referred to by name and can be called (invoked) at any point in a program simply by utilizing the method's name. Think of a method as a subprogram that acts on data and often returns a value. Each method has its own name.

Yes, you can. Since main is defined as having one argument, which is String[] args, you will have call it like any other function with one argument of type String[]. If your main function does nothing with its arguments, you can just write: "main(new String[1]);". However, you have to be careful with calling the main method more than one time, because it can give you an infinite recursion that will end in a StackOverflowError. So make sure the calls to the main method are stopped when some condition is met.

Yes. Android apps are built using Java.

To organize Java files properly, otherwise Java might get confused on class names (e.g. class Test inside WikiHow-Example.java and class Test inside Personal-Example.java). Java has that as a requirement for most OSes (Linux might be excluded).

Since void methods do not return any data type, you just call them on their own line. For example, if you have a void method called "printUsername", call it with "printUsername();". If the method takes in any parameters, make sure to include those in the parenthesis.

The main method is the entry point of a Java program and it is called by the Java Virtual Machine (JVM) when the program is executed. Other methods in a Java program are typically called by other methods or statements within the program. For example, if you have a method called printHello() that simply prints "Hello" to the console, you might call it from the main method like this: public class Main { public static void main(String[] args) { printHello(); } public static void printHello() { System.out.println("Hello"); } } In this case, the main method calls the printHello method. The printHello method is executed when it is called, and it prints "Hello" to the console.