A simple Java program:
In order to give you a flavour of what Java looks like we have reproduced a very simple Java program below.
public class HelloReader
{
public static void main (String []args)
{
System.out.println("The time has gone");
System.out.println("the Reader said");
}
}
This program produces screen output as follows:
The time has gone
the Reader said
The first line of the program introduces a class,called HelloWalrus. When the program runs, the class gives rise to an object, which executes the code of the class. There are more details about classes and object-oriented programming later in this unit.
This class is defined as public, which means that objects of this class can be freely accessed by other objects in a larger system. The curly bracket on the line following HelloWalrus matches the closing bracket at the end of the example, as these enclose the whole class definition.
The code in this class is in the form of a method, in this case a method called main.The ?rst line of the method is called the method header. We defer explaining the words static and void until later, but they are always used with main methods like this one. These two words are examples of Java keywords - words that have a special meaning in a Java program, and that cannot be used for any other purpose. The other keywords in this example are public and class.
The method header de?nes the name of the method (in this case, main) and is followed by the method body, which is enclosed in curly brackets. The System.out.println method displays, in a screen window, the exact text between the quotes. Each of these two lines of code within the main method constitutes a statement, a single command to be carried out. Each statement is terminated by a semicolon.
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