BeanShell04.bsh

/**
 * BeanShell04.bsh
 * IJ BAR: https://github.com/tferr/Scripts#scripts
 * *************************************************
 * 4. Methods and the super keyword
 * *************************************************
 */

// BeanShell methods ("Java functions") are defined as
// in Java, with return values specified by a <return>
// statement. Bsh methods allow dynamic (loose) of both
// arguments and return types. We will come back to this
// in a second. Meanwhile, here is an example of a
// method that takes no arguments:

/** This method returns a string of today's date */
today() {
    import java.util.Date;	// http://javadoc.imagej.net/Java7/index.html?java/util/Date.html
    date = new Date();
    return date.toString();	// http://javadoc.imagej.net/Java7/index.html?java/lang/Object.html#toString--
}

print("Line 23: today() returned" + today());


// A Method with arguments:
/**
 *  This method returns the smallest of two arguments, and is a
 *  kludged assembly of Java.lang.Math.min(), see
 *  http://javadoc.imagej.net/Java7/index.html?java/lang/Math.html
 */
minMethod(a, b) {
	if (a < b) {
		return a;
	} else {
		return b;
	}
}

print("Line 40: " + minMethod(10,20) + "is smaller");


// We can also specify argument and/or return types:
/** This method sums only integers */
int intSum(int a, int b) {
	return a + b;
}

print("Line 49: The sum of 2 integers: " + intSum(2,4) );

// void methods do not return any value:
void voidMethod() {
	print("I return nothing. I just print stuff.");
}
print("Line 55: " + voidMethod());


// Now let's have a look at "Global variables":
// It is possible to explicitly refer to a declared variable
// (or method) defined outside the scope of a method using
// the <super> keyword, similarly to Python's <global>
// keyword (Python04.py tutorial). Example:
int variable = 2;
myMethod() {
	int variable = 40;
	print("Line 66: Inside the method, variable= " + variable);
	print("Line 67: Outside the method, variable= " + super.variable);
	// Note that this would not work for loosely declared variables
	// What happens when one does not specify the variable data type?
}
myMethod();

// To know more: http://www.beanshell.org/manual/