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Using the Java console

In browsers that support LiveConnect (interaction between Java and JavaScript, discussed later in the

book), you can use the Java console to log messages to yourself just as you can in Java.

For example, in Java you can log messages to the console window by doing this:

System.out.println(“Message”);

In JavaScript, you can do the same by expanding the

System

variable into its full

java.lang.System

notation:

java.lang.System.out.println(“Message”);

Placing calls like this into a function is a great way to track code execution:

function test_function() {

java.lang.System.out.println(“Entering function.”);

var iNumber1 = 5;

var iNumber2 = 10;

java.lang.System.out.println(“Before calculation.”);

var iResult = iNumber1 + iNumber2;

java.lang.System.out.println(“After calculation.”);

java.lang.System.out.println(“Leaving function.”);

}

To see the output, select Tools

Java Console. You see the output after the default Java console output

(Figure 14-10).

Figure 14-10

429

Error Handling

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