java 数据相加--泛型接口的实现

题目要求：数据往往具有相加的功能，但是对于不同具体类型，相加的含义有所不同，比如复数的相加的结果依然是一个复数，其实部为两个实部之和、虚部为两个虚部之和。而圆相加的结果依然是圆，其圆心为两个圆心的中点，而半径为两个半径之和。要求定义一个具有“相加”的泛型接口。

解题思路：

定义一个规范的泛型接口

复制之前的代码 实现接口的功能

改写toString实现输出 不同类型的相加结果

package _05_第五章泛型.E202_05_02_数据相加;
public class Test {
    public static void main(String[] args) {
        Point p1 = new Point(1,1);
        Point p2 = new Point(3,2);

        Circle circle = new Circle(p1,2);
        Circle circle2 = new Circle(p2,3);
        System.out.printf("两个 圆 相加结果：\n");
        System.out.println(circle2.add(circle));

        Complex complex = new Complex(1,1);
        Complex complex2 = new Complex(2,2);
        System.out.printf("两个 复数 相加结果：\n");
        complex2.Print(complex2.add(complex));
    }
}

package _05_第五章泛型.E202_05_02_数据相加;
public interface Add<T> {
    public T add(T t);
}

package _05_第五章泛型.E202_05_02_数据相加;
public class Circle implements Add<Circle> {
    private Point p;//圆心
    private float r;//半径

    public Circle(Point p, float r) {
        this.p = p;
        this.r = r;
    }
    public Circle add(Circle circle2){
        circle2.p =this.p.add(circle2.p);
        circle2.r =this.r + circle2.r ;
        return circle2;
    }
    @Override
    public String toString() {
        return String.format("圆心：(%f,%f)  半径：%f",p.x,p.y,r);
    }
}

package _05_第五章泛型.E202_05_02_数据相加;

public class Complex implements Add<Complex> {
    private int real;//实部
    private int imag;//虚部

    public Complex(int real, int imag){
        this.real = real;
        this.imag = imag;
    }
    public Complex add(Complex complex2){
        complex2.real = this.real + complex2.real;
        complex2.imag = this.imag + complex2.imag;
        return complex2;
    }
    public void Print(Complex complex){
        System.out.printf("复数和 = %d + %d i \n",complex.real,complex.imag);
        System.out.printf("复数差 = %d + (%d) i",complex.real,complex.imag);
    }
}

package _05_第五章泛型.E202_05_02_数据相加;
public class Point implements Add<Point> {
    public   float x;//x是属性
    public   float y;

    public Point(float x,float y){ //x是形参 函数内部有效
        this.x = x; //如果写成 x = x就错了 ，需要加this 不然起不到改float x的作用
        this.y = y;
    }

    public Point add(Point point2){
        point2.x = (point2.x + this.x)/2f;
        point2.y = (point2.y + this.y)/2f;
        return point2;
    }
    @Override
    public String toString() {
        return String.format("(%f,%f)",x,y);
    }
}