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Java Cookbook
book

Java Cookbook

by Ian F. Darwin
June 2001
Intermediate to advanced content levelIntermediate to advanced
888 pages
21h 1m
English
O'Reilly Media, Inc.
Content preview from Java Cookbook

Program: Debug

Most of the chapters of this book will end with a “Program” recipe that illustrates some aspect of the material covered in the chapter. Example 1-2 is the source code for the Debug utility mentioned in Section 1.12.

Example 1-2. Debug.java

package com.darwinsys.util;

/** Utilities for debugging
 */
public class Debug {
    /** Static method to see if a given category of debugging is enabled.
     * Enable by setting e.g., -Ddebug.fileio to debug file I/O operations.
     * Use like this:<BR>
     * if (Debug.isEnabled("fileio"))<BR>
     *     System.out.println("Starting to read file " + fileName);
     */
    public static boolean isEnabled(String category) {
        return System.getProperty("debug." + category) != null;
    }

    /** Static method to println a given message if the
     * given category is enabled for debugging.
     */
    public static void println(String category, String msg) {
        if (isEnabled(category))
            System.out.println(msg);
    }
    /** Same thing but for non-String objects (think of the other
     * form as an optimization of this).
     */
    public static void println(String category, Object stuff) {
        println(category, stuff.toString(  ));
    }
}
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Publisher Resources

ISBN: 0596001703Supplemental ContentCatalog PageErrata