1 Java Basics for AnyLogic 6 Dang van son

2 Agenda Development Environment Types & Expressions Calling Methods and Accessing Fields Replicated Objects Built-in Functions Main Language Constructs Example

3 Development Environment Development environment is Java and Eclipse based application Simulation applets run in any Java-enabled browser with the following version of JRE Simulation Application is pure Java applicationJava

4 Types & Expressions Primitive Types Double –represent real numbers: 1.43, 3.6E18, Int –represents integer numbers: 12, 16384, Boolean –represents Boolean (true/false) values Compound Types –Classes String –represents textual strings ArrayList, LinkedList –collections of objects HyperArray –represents multi-dimensional array in System Dynamics models …many others.

5 Types & Expressions Arithmetic operations Notation: +, –, *, /, %(remainder) In integer divisions, the fraction part is lost, e.g. 3 / 2 equals 1, and 2 / 3 equals 0 Multiplication operators have priority over addition operators The ‘+‘operator allows operands of type String Comparison operations Notation: >, >=, <, <=, ==, != Boolean operations Notation: &&(AND), ||(OR), !(NOT) Conditional operator Notation: condition ?value-if-true :value-if-false Assignments and shortcuts Notation: =, +=, -=, *=, /=, %=, ++, -- Example: a+=b is equivalent to a = a + b

6 Calling Methods and Accessing Fields Method call Type its name followed by parenthesis. If necessary, put parameters separated by commas within the parenthesis. Ex: x = time(); Accessing object fields and methods Use the model element name followed by dot ‘.’followed by the field/method name. Ex: statechart.fireEvent( “go”);

7 Replicated Objects Replicated objects are stored in a collection Items are indexed from 0 to N-1 Getting the current size of the collection: people.size() Obtaining i-thitem of the collection: people.get( i ) Adding a new object to the collection: add_people(); Removing an object from the collection: remove_people( person );

8 Built-in Functions System functions time(), getOwner(), pause(), isStateActive(…), etc Mathematical functions Basic: sqrt, sin, cos, tan, exp, log, round, zidz, xidz, etc– Array: add, sub, mul, sum, avg, min, max, get, etc Special functions Random numbers: uniform, exponential, bernoulli, beta, etc–Time related: delay, etc And more… See Utilities, Presentable, ActiveObjectand Agentclasses in AnyLogic Class Reference

9 Main Language Constructs Assignment / action statement: y = f(x1,x2) + 5*z; event.restart( uniform( 10, 20 ) ); Decision statement: if ( friendsRatio> attackConstant)attack(); else {escape();} Loop statement: double total = 0; for ( Person p : people ) total += p.income; for( inti=0; i<100; i++ ) send( msg, RANDOM );

10 Example

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