Constructors create new instances of a class, that is objects. Constructors are special methods that have the same name as their class and no return type. For example,
class TwoDPoint {
double x;
double y;
TwoDPoint(double xvalue, double yvalue) {
this.x = xvalue;
this.y = yvalue;
}
String getAsString() {
return (+ this.x + ,+ this.y + );
}
void setX(double value) {
this.x = value;
}
void setY(double value) {
this.y = value;
}
double getX() {
return this.x;
}
double getY() {
return this.y;
}
}
}
Constructors are used along with the new keyword to
produce an object in the class (also called an instance of the
class):
TwoDPoint origin = new TwoDPoint(0.0, 0.0);
System.out.println("The x coordinate is + origin.getX());
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