package pratise;
//A class for two-dimensional objects
class TwoDShape{
private double width; //two are
private double height; //now private
//Accessor methods for width and height
double getWidth() {return width;}
double getHeight() {return height;}
void setWidth(double w) {width = w;}
void setHeight(double h) {height = h;}
void showDim(){
System.out.println("Width and Heigth are " + getWidth() + " and " + getHeight());
}
}
//A subclass of TwoDShape for triangles
class Triangle extends TwoDShape{
String style;
double area(){
return getWidth() * getHeight() / 2;
}
void showStyle(){
System.out.println("Triangle is " + style);
}
}
public class Construct {
public static void main(String[] args) {
Triangle t1 = new Triangle();
Triangle t2 = new Triangle();
t1.setWidth(4.0);
t1.setHeight(4.0);
t1.style = "filled";
t2.setWidth(8.0);
t2.setHeight(12.0);
t2.style = "outlined";
System.out.println("Info for t1: ");
t1.showStyle();
t1.showDim();
System.out.println("Area is " + t1.area());
System.out.println();
System.out.println("Info for t2: ");
t2.showStyle();
t2.showDim();
System.out.println("Area is " + t2.area());
}
}
package pratise;
//A class for two-dimensional objects
class TwoDShape{
private double width; //two are
private double height; //now private
//Accessor methods for width and height
double getWidth() {return width;}
double getHeight() {return height;}
void setWidth(double w) {width = w;}
void setHeight(double h) {height = h;}
void showDim(){
System.out.println("Width and Heigth are " + getWidth() + " and " + getHeight());
}
}
//A subclass of TwoDShape for triangles
class Triangle extends TwoDShape{
private String style;
//Constructor
Triangle(String s, double w, double h){
setWidth(w);
setHeight(h);
style = s;
}
double area(){
return getWidth() * getHeight() / 2;
}
void showStyle(){
System.out.println("Triangle is " + style);
}
}
public class Construct {
public static void main(String[] args) {
Triangle t1 = new Triangle("filled", 4.0, 4.0);
Triangle t2 = new Triangle("outlinde", 8.0, 8.0);
System.out.println("Info for t1: ");
t1.showStyle();
t1.showDim();
System.out.println("Area is " + t1.area());
System.out.println();
System.out.println("Info for t2: ");
t2.showStyle();
t2.showDim();
System.out.println("Area is " + t2.area());
}
}
package pratise;
//A class for two-dimensional objects
class TwoDShape{
private double width; //two are
private double height; //now private
//Parameterized constructor 超类的构造函数
TwoDShape(double w, double h){
width = w;
height = h;
}
//Accessor methods for width and height
double getWidth() {return width;}
double getHeight() {return height;}
void setWidth(double w) {width = w;}
void setHeight(double h) {height = h;}
void showDim(){
System.out.println("Width and Heigth are " + getWidth() + " and " + getHeight());
}
}
//A subclass of TwoDShape for triangles
class Triangle extends TwoDShape{
private String style;
//subclass constructor
Triangle(String s, double w, double h){
super(w, h); //使用super（）执行超类 的构造函数！！
style = s;
}
double area(){
return getWidth() * getHeight() / 2;
}
void showStyle(){
System.out.println("Triangle is " + style);
}
}
public class Construct {
public static void main(String[] args) {
Triangle t1 = new Triangle("filled", 4.0, 4.0);
Triangle t2 = new Triangle("outlinde", 8.0, 8.0);
System.out.println("Info for t1: ");
t1.showStyle();
t1.showDim();
System.out.println("Area is " + t1.area());
System.out.println();
System.out.println("Info for t2: ");
t2.showStyle();
t2.showDim();
System.out.println("Area is " + t2.area());
}
}
