4JavaProgrammers.vala added
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using Gee;
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public interface Clone {
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public abstract Object clone ();
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}
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public class Demo : Object, Clone {
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public Demo () {
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print ("Default Constructor called\n");
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Demo.with_string ("DefaultB");
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}
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public Demo.with_string (string _s) {
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print ("Constructor.with_string() called\n");
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s = _s;
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}
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public string s { get; set; default = "DefaultA"; }
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public virtual void draw () {
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print ("Demo::draw()\n");
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}
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public Object clone () {
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var d = new Demo ();
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d.s = this.s;
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return d;
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}
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}
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public interface Foo : Object {
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public abstract void foo (int i);
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}
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public class DemoChild : Demo, Foo {
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public override void draw () {
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base.draw();
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print ("DemoChild::draw()\n");
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}
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public void foo (int i) {
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}
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}
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enum Machine {
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CAR,
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BYCICLE,
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LEGS;
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public bool is_fast () {
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return this == CAR;
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}
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}
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public class MyHashMap : HashMap <string, int>, Clone {
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public Object clone () {
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var h = new MyHashMap ();
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foreach (var i in this.entries) {
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h[i.key] = i.value;
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}
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return h;
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}
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}
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public class Car : Object {
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public int color { get; set; default = 0; }
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[CCode (notify = false)]
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public int color_without_notification { get; set; default = 0; }
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}
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delegate void MyDelegateType (int a, double b);
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void f (MyDelegateType deleg) {
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deleg (32, 0.25);
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}
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/* Signals */
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public class MyButton : Object {
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public signal void clicked ();
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public void test () {
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print ("MyButton::test () called - calls clicked()\n");
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clicked ();
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}
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}
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void handler_c (MyButton source) {
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print ("Handler for MyButton called\n");
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}
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errordomain CarError {
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BROKEN_WHEEL,
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ENGINE_WEDGE
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}
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void method () throws CarError {
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throw new CarError.ENGINE_WEDGE ("Engine is broken!");
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}
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void init_a (ref int a) {
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}
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void my_method (int a, out int b, ref int c) {
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b = 3;
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}
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void my_null_method (Object? a, Object b) { }
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int method_with_preconditions (double d, int i, Object obj)
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requires (d >= 0.0 && d <= 1.0)
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requires (i >= 0 && i <= 10)
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ensures (result >= 0) {
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return i * i;
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}
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/* Plane vs Struct */
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class Plane {
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public double speed;
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public int weight;
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public Plane (double speed, int weight) {
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this.speed = speed;
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this.weight = weight;
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}
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public void print () {
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stdout.printf ("(%g, %d)", this.speed, this.weight);
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}
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}
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struct Plane_s {
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public double speed;
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public int weight;
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public Plane_s (double speed, int weight) {
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this.speed = speed;
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this.weight = weight;
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}
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public void print () {
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stdout.printf ("(%g, %d)", this.speed, this.weight);
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}
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}
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/* Static Construct */
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public class FooWithStaticConstruct {
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static construct {
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stdout.printf ("FooWithStaticConstruct: Static constructor invoked\n");
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}
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}
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public class FooWithStaticConstructChild {
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static construct {
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stdout.printf ("FooWithStaticConstructChild: Static constructor invoked\n");
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}
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}
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void main () {
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var d1 = new DemoChild ();
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print (d1.s + "\n");
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d1.draw();
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print ((d1 is DemoChild).to_string() + "\n");
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Demo d2 = d1.clone() as Demo;
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print ((d2 is DemoChild).to_string() + "\n");
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d1.s = "d1";
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d2.s = "d2";
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print (d2.s + "\n");
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d2.s = "d2 updated";
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print (d1.s + "\n");
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print (d2.s + "\n");
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print ("--- HashMap ---\n");
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var h1 = new MyHashMap ();
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var h2 = h1.clone () as MyHashMap;
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h1["aaa"] = 3;
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h2["bbb"] = 4;
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foreach (var h in h1.keys) {
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stdout.printf ("%s", h + "\n");
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}
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foreach (var h in h2.keys) {
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stdout.printf ("%s", h + "\n");
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}
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foreach (var h in h2.entries) {
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stdout.printf ("%s", "--- " + h.get_type ().name () + " ---\n");
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}
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stdout.printf ("%s", "--- " + h2.get_type ().name () + " ---\n");
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var car = new Car ();
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car.notify.connect ((s, p) => stdout.printf ("Property `%s` changed\n",
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p.name));
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car.notify["color"].connect ((s, p) => stdout.printf ("Property `%s` changed\n",
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p.name));
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car.color = 5;
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MyDelegateType deleg = (a, b) => {
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stdout.printf ("a = %d; b = %g\n", a, b);
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};
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deleg (42, 0.75);
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f (deleg);
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print ("--- Signals ---\n");
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var b = new MyButton ();
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b.clicked.connect ((s) => print ("Unnamed handler A\n"));
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b.clicked.connect ((s) => {
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print ("Unnamed handler B\n");
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});
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b.clicked.connect (handler_c);
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b.test ();
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b.clicked.disconnect (handler_c);
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print ("--- Exceptions ---\n");
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try {
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method ();
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} catch (CarError e) {
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stderr.printf ("Error: %s\n", e.message);
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}
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print ("--- Out and Ref Variables ---\n");
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int a1, b1, c1 = 5;
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my_method (a1 = 5, out b1, ref c1);
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print ("--- Nullability ---\n");
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my_null_method (null, new Object ());
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string? a = "hello";
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string a2 = (!) a;
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print ("--- {Pre,Post}conditions ---\n");
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method_with_preconditions (1, 0, new Object ());
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print ("--- Class vs Struct ---\n");
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var p1 = new Plane (23.23, 293);
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var p2 = p1;
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print ("Class: ");
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p1.print ();
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p2.print ();
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print (" -> ");
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p2.speed = 777;
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p1.print ();
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p2.print ();
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stdout.printf (" p1 == p2 ? %s", (p1 == p2).to_string ());
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print ("\n");
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var p1_s = Plane_s (23.23, 293);
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var p2_s = p1_s;
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print ("Struct: ");
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p1_s.print ();
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p2_s.print ();
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print (" -> ");
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p2_s.speed = 777;
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p1_s.print ();
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p2_s.print ();
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stdout.printf (" p1_s == p2_s ? %s", (p1_s == p2_s).to_string ());
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print ("\n");
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print ("--- Static Construct ---\n");
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var foo_construct = new FooWithStaticConstruct ();
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var foo_construct2 = new FooWithStaticConstruct ();
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var foo_construct_child = new FooWithStaticConstructChild ();
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var foo_construct_child2 = new FooWithStaticConstructChild ();
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}
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