alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Scala example source code file (boolexprs.scala)

This example Scala source code file (boolexprs.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Scala tags/keywords

array, boolean, counter, counter, int, int, string, test, test1, test1, test2, test2, throwable

The Scala boolexprs.scala source code

//############################################################################
// Boolean Expressions
//############################################################################

class Counter {
  private var n: Int = 0;
  def incrThen(b: Boolean) = if (b) n += 1;
  def value = n;
}

object Test1 {
  var flag = false;
  def flip: Boolean = { val tmp = flag; flag = !flag; tmp } 
  def run: Int = {
    val c = new Counter;
    c.incrThen(flip || flip);
    c.value
  }
}

object Test2 {
  val a = Array(false);

  def run: Int = {
    val c = new Counter;
    c.incrThen(true && a(0));
    c.incrThen(false || Nil.length > 0);
    c.value
  }
}

//############################################################################
// Test code

object Test {
  def check_success(name: String, closure: => Int, expected: Int) {
    Console.print("test " + name);
    try {
      val actual: Int = closure;
      if (actual == expected) {
        Console.print(" was successful");
      } else {
        Console.print(" failed: expected "+ expected +", found "+ actual);
      }
    } catch {
      case exception: Throwable =>
        Console.print(" raised exception " + exception);
    }
    Console.println;
  }

  def main(args: Array[String]) {
    check_success("Test1", Test1.run, 1);
    check_success("Test2", Test2.run, 0);
    Console.println;
  }
}

//############################################################################

Other Scala examples (source code examples)

Here is a short list of links related to this Scala boolexprs.scala source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.