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Java Basics for AnyLogic 6

Java Basics for AnyLogic 6. Dang van son. Agenda. Development Environment Types & Expressions Calling Methods and Accessing Fields Replicated Objects Built-in Functions Main Language Constructs Example. Development Environment.

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Java Basics for AnyLogic 6

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  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 application

  4. Types & Expressions • Primitive Types • Double –represent real numbers: 1.43, 3.6E18, -14.0 • Int –represents integer numbers: 12, 16384, -5000 • 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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