Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: “ACC_PUBLIC (0x0001) indicates that the class is public and can be accessed from other packages.”

A block of code is set as follows:

public final class AccessSample {    private int value;
    public AccessSample(int value) {
        this.value = value;
    }

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

public class ConstantPoolSample {    private String message = "Hello, Java!"; // String literal stored 
                                             // in the constant pool 
    public static void main(String[] args) {
        ConstantPoolSample sample = new ConstantPoolSample();
        System.out.println(sample.message); // Accessing the field 
                                          // with a symbolic reference
    }
}

Any command-line input or output is written as follows:

javac Animal.java javap -verbose Animal 

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “It’s worth mentioning that alternatives such as InstantOn from Open Liberty also exist”

Tips or important notes

Appear like this.