The Log class:
API for sending log output.
Generally, use the
Log.v()Log.d()Log.i()Log.w()andLog.e()methods.The order in terms of verbosity, from least to most is
ERROR,WARN,INFO,DEBUG,VERBOSE. Verbose should never be compiled into an application except during development. Debug logs are compiled in but stripped at runtime. Error, warning and info logs are always kept.
Outside of Android, System.out.println(String msg) is used.
The Log class:
API for sending log output.
Generally, use the
Log.v()Log.d()Log.i()Log.w()andLog.e()methods.The order in terms of verbosity, from least to most is
ERROR,WARN,INFO,DEBUG,VERBOSE. Verbose should never be compiled into an application except during development. Debug logs are compiled in but stripped at runtime. Error, warning and info logs are always kept.
Outside of Android, System.out.println(String msg) is used.
Use the Android logging utility.
http://developer.android.com/reference/android/util/Log.html
Log has a bunch of static methods for accessing the different log levels. The common thread is that they always accept at least a tag and a log message.
Tags are a way of filtering output in your log messages. You can use them to wade through the thousands of log messages you'll see and find the ones you're specifically looking for.
You use the Log functions in Android by accessing the Log.x objects (where the x method is the log level). For example:
CopyLog.d("MyTagGoesHere", "This is my log message at the debug level here");
Log.e("MyTagGoesHere", "This is my log message at the error level here");
I usually make it a point to make the tag my class name so I know where the log message was generated too. Saves a lot of time later on in the game.
You can see your log messages using the logcat tool for android:
Copyadb logcat
Or by opening the eclipse Logcat view by going to the menu bar
CopyWindow->Show View->Other then select the Android menu and the LogCat view
Console.log in Java extension? - Jazz Forum
Using java.util.logging to log on the console - Stack Overflow
debugging - Console.log in a Java Back-end - Stack Overflow
How do I check java console log.? - Stack Overflow
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Very simple, a logger can have several handlers, with each a different level.
handler.setLevel(Level.ALL);
Logging on the standard System.out stream could be easily done by adding a StreamHandler handler:
logger.addHandler(new StreamHandler(System.out, new SimpleFormatter()))
You can use System.out.print("Hello word") in order to print on your console.
If you want to learn more https://www.javatpoint.com/system-out-println-in-java
Java doesn't use console.log; it is a totally different language than Javascript. You would use System.out.print or System.out.println instead.
Good luck with your learning!