第一题：
public class Complex {
private double real;// 实部
private double imagin;// 虚部
// 重载默认构造方法
public Complex() {
real = 0;
imagin = 0;
}
// 有参构造方法
public Complex(double real, double imagin) {
this.real = real;
this.imagin = imagin;
}
// 获取实部
public double getReal() {
return real;
}
// 获取虚部
public double getImagin() {
return imagin;
}
// 虚数相加
public Complex complexAdd(Complex number) {
return new Complex(this.getReal() + number.getReal(), this.getImagin()
+ number.getImagin());
}
// 虚数想减
public Complex complexMinus(Complex number) {
return new Complex(this.getReal() - number.getReal(), this.getImagin()
- number.getImagin());
}
// 虚数想乘
public Complex complexMulti(Complex number) {
return new Complex(this.getReal() * number.getReal(), this.getImagin()
* number.getImagin());
}
//重载toString
public String toString() {
return ""+real+"+"+imagin+"i";
}
public static void main(String[] args) {
//测试桩
Complex c1 = new Complex(2,3);
Complex c2 = new Complex(4,6);
//测试加法
System.out.println(c1.complexAdd(c2));
//减法
System.out.println(c1.complexMinus(c2));
//乘法
System.out.println(c1.complexMulti(c2));
//toString验证
Complex c = new Complex(2,3);
System.out.println(c);
}
}
第二题：
1. 抽象父类Shape：
//父类接口
public abstract class Shape {
public double getSquare(){
return 0;
}
}
2. 三角形子类
public class Triangle extends Shape {
private double a;// 三角形底边长度
private double h;// 三角形的高
// 构造方法
public Triangle(double a, double h) {
this.a = a;
this.h = h;
}
// 三角形面积
public double getSquare() {
return a * h / 2;
}
}
3.正方形子类
public class Square extends Shape {
private double a;// 正方形边长
// 构造方法
public Square(double a) {
this.a = a;
}
public double getSquare() {
return a*a;
}
}
3.圆形子类
public class Circle extends Shape {
public static final double PI = 3.14;
private double r;// 圆形半径
// 构造方法
public Circle(double r) {
this.r = r;
}
public double getSquare() {
return PI*r*r;
}
}
4. 测试桩主方法：
//测试桩主方法
public class TestShape {
public static void main(String[] args) {
//三角形实现
Triangle t = new Triangle(2,2);
System.out.println(t.getSquare());
//正方形实现
Square s = new Square(3);
System.out.println(s.getSquare());
//圆形实现
Circle c = new Circle(4);
System.out.println(c.getSquare());
}
}