ICS3U-Basic OUTPUT in java

In the first Java program we created:

class HelloWorldApp {

public static void main(String[] args) {

System.out.println("Hello World!");

}

}

System.out.println("Hello World!");

is responsible for outputting words to the screen.

The function: System.out.println( );

is part of the Input/Output library of to the Java language and is used to output text to the screen.

Input/Output streams (I/O streams) are clearly necessary in order to do anything useful in Java.

The function " System.out.println( );" takes a string, or a number as a parameter. Additionally you can "build a string" by using the "+" operator.

For example:

String x = "Paul";

System.out.println("hello " + x );

This code will print out the phrase "hello Paul"

Printing special characters using the System.out.println( ) function:

Certain ASCII characters that are difficult to represent in a string either because they are not viewable (like an enter key) or because they are part of the formatting of strings in Java (like a " or a ' or a \ ). In order to display these characters, you must represent them using a character code or "control code" in the string that you are including them in. Shown below is a list of some common "control codes".