分别定义一个形状(Shape)的抽象类和接口,该抽象类或接口有求面积的抽象方法getArea(),并且有正方形(Rect)和圆形(Circle)继承或实现Shape,利用类方法的重写,覆盖抽象方法getArea(),然后定义一个Test类,在main方法中生成具体对象,分别计算各个图形的面积 注意: 1.重写要求覆盖父类的求面积的方法getArea();接口: public interface Shape { double Getarea(double length);} public class Circle implements Shape { private final double PI = 3.14; public double Getarea(double length) { return PI * length * length / 4; }} public class Rect implements Shape { public double Getarea(double length) { return length * length; } } public class Test { public static void main(String[] args) { Rect Jie = new Rect(); Circle S = new Circle(); System.out.println(Jie.Getarea(2)); System.out.println(S.Getarea(6)); } } 抽象类:public abstract class Shape {
public abstract double Getarea(double length);
} public class Circle extends Shape { final double PI=3.14; public double Getarea(double length){ return PI*length*length; } } public class Rect extends Shape { public double Getarea(double length){ return length*length; }} public class Test { public static void main(String[] args){ Rect Jie=new Rect(); Circle S=new Circle(); System.out.println(S.Getarea(1)); System.out.println(Jie.Getarea(6)); } } 题目较简单,不知楼主是否满意。
注意:
1.重写要求覆盖父类的求面积的方法getArea();接口:
public interface Shape {
double Getarea(double length);}
public class Circle implements Shape {
private final double PI = 3.14; public double Getarea(double length) {
return PI * length * length / 4;
}}
public class Rect implements Shape {
public double Getarea(double length) {
return length * length;
}
}
public class Test {
public static void main(String[] args) {
Rect Jie = new Rect();
Circle S = new Circle();
System.out.println(Jie.Getarea(2));
System.out.println(S.Getarea(6));
}
}
抽象类:public abstract class Shape {
public abstract double Getarea(double length);
}
public class Circle extends Shape {
final double PI=3.14;
public double Getarea(double length){
return PI*length*length;
}
}
public class Rect extends Shape {
public double Getarea(double length){
return length*length;
}}
public class Test {
public static void main(String[] args){
Rect Jie=new Rect();
Circle S=new Circle();
System.out.println(S.Getarea(1));
System.out.println(Jie.Getarea(6));
}
}
题目较简单,不知楼主是否满意。