java期中作业

1、将课本上的复数类补充抽象完善，类名为公有的Complex，抽象私有双精度类型的实部和虚部，提供构造方法和get方法和set方法，重写equals方法、hashcode方法、toString方法，提供类方法用于加减乘除计算，当然要有输入和输出方法。最后还要提供一个类方法getDesigner,返回字符串：“设计者：[姓名]  学号：[学号] 班级：[班级]”。

import java.util.Scanner;

public class Complex {

private double realpart;private double imaginarypart;

public double getRealpart() {

return realpart;

}

public void setRealpart(double realpart) {

this.realpart = realpart;

}

public double getImaginarypart() {

return imaginarypart;

}

public void setImaginarypart(double imaginarypart) {

this.imaginarypart = imaginarypart;

}

@Override

public int hashCode() {

final int prime = 31;

int result = 1;

long temp;

temp = Double.doubleToLongBits(imaginarypart);

result = prime * result + (int) (temp ^ (temp >>> 32));

temp = Double.doubleToLongBits(realpart);

result = prime * result + (int) (temp ^ (temp >>> 32));

return result;

}

@Override

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null)

return false;

if (getClass() != obj.getClass())

return false;

Complex other = (Complex) obj;

if (Double.doubleToLongBits(imaginarypart) != Double.doubleToLongBits(other.imaginarypart))

return false;

if (Double.doubleToLongBits(realpart) != Double.doubleToLongBits(other.realpart))

return false;

return true;

}

Complex(){realpart = 0;imaginarypart = 0;}

Complex(double s,double x) {realpart = s;imaginarypart = x;}

public boolean equals(Complex another) {

return(this.realpart== another.realpart

&&this.imaginarypart == another.imaginarypart);

}

public String toString() {

String str =""+realpart;

if(imaginarypart<0.0) str = str + imaginarypart +"i";

else str = str + "+"+imaginarypart +"i";

return str;

}

public void input() {

Scanner keyin = new Scanner(System.in);

System.out.println("real:");

realpart = keyin.nextDouble();

System.out.println("imaginary:");

imaginarypart = keyin.nextDouble();

}

public void display() {

System.out.println(toString());

}

public static Complex add(Complex m1, Complex m2) {

double realpart=m1.getRealpart()+m2.getRealpart();

double imaginarypart=m1.getImaginarypart()+m2.getImaginarypart();

return new Complex(realpart,imaginarypart);

}

public    static Complex sub(Complex m1, Complex m2)

{

double realpart=m1.getRealpart()-m2.getRealpart();

double imaginarypart=m1.getImaginarypart()-m2.getImaginarypart();

return new Complex(realpart,imaginarypart);

}

public static Complex mul(Complex m1,Complex m2)

{

double realpart=m1.getRealpart()*m2.getRealpart()-m1.getImaginarypart()*m2.getImaginarypart();

double imaginarypart=m1.getRealpart()*m2.getImaginarypart()+m2.getRealpart()*m1.getImaginarypart();

return new Complex(realpart,imaginarypart);

}

public static  Complex div(Complex m1,Complex m2)

{

double  realpart=(m1.getRealpart()*m2.getRealpart()+m1.getRealpart()*m2.getImaginarypart())/(m2.getRealpart()*m2.getRealpart()+m2.getImaginarypart()*m2.getImaginarypart());

double imaginarypart=(m2.getRealpart()*m1.getImaginarypart()-m1.getRealpart()*m2.getImaginarypart())/(m2.getRealpart()*m2.getRealpart()+m2.getImaginarypart()*m2.getImaginarypart());

return new Complex(realpart,imaginarypart);

}

public  static   String getDesigner() {

String content  ="设计者：[]  学号：[] 班级：[]";

return content;

}

public static void main (String args[]) {

System.out.println(Complex.getDesigner());

Complex m1 =  new Complex();

Complex m2 = new Complex();

System.out.println("Please input the first complex's real part and imaginary part :");

m1.input();

System.out.print("The first Complex is :");

m1.display();

System.out.println("Please input the second complex's real part and imaginary part :");

m2.input();

System.out.print("The second Complex is :");

m2.display();

System.out.println("m1==m2="+(m1==m2));

System.out.println("m1.equals(m2)="+m1.equals(m2));

Complex m3 = Complex.add(m1,m2);

Complex m4 = Complex.sub(m1,m2);

Complex m5 =Complex.mul(m1,m2);

Complex m6 =Complex.div(m1,m2);

System.out.println("m1+m2="+m3);

System.out.println("m2-m3="+m4);

System.out.println("m1*m2="+m5);

System.out.println("m1/m2="+m6);

}

}

​

2、抽象四维空间（三维空间坐标+一维时间坐标）的质点，要求用实数表示坐标值，还应该有质点的质量等属性。要求对所有属性的抽象都是封装的，并提供相应的get方法和set方法。要求抽象的方法中有toString方法、equals方法、相应的构造方法和hashcode方法。另外还要求提供质点的移动方法，提供两个质点之间距离计算方法，提供两个质点之间的引力计算方法等。并设计main方法来完成各方法的测试，最后还要提供一个类方法getDesigner,返回字符串：“设计者：[姓名]  学号：[学号] 班级：[班级]”。

四维时空

import java.util.Scanner;

class Point

{private double  x,y,z,t,m;

@Override

public int hashCode() {

final int prime = 31;

int result = 1;

long temp;

temp = Double.doubleToLongBits(m);

result = prime * result + (int) (temp ^ (temp >>> 32));

temp = Double.doubleToLongBits(t);

result = prime * result + (int) (temp ^ (temp >>> 32));

temp = Double.doubleToLongBits(x);

result = prime * result + (int) (temp ^ (temp >>> 32));

temp = Double.doubleToLongBits(y);

result = prime * result + (int) (temp ^ (temp >>> 32));

temp = Double.doubleToLongBits(z);

result = prime * result + (int) (temp ^ (temp >>> 32));

return result;

}

@Override

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null)

return false;

if (getClass() != obj.getClass())

return false;

Point other = (Point) obj;

if (Double.doubleToLongBits(m) != Double.doubleToLongBits(other.m))

return false;

if (Double.doubleToLongBits(t) != Double.doubleToLongBits(other.t))

return false;

if (Double.doubleToLongBits(x) != Double.doubleToLongBits(other.x))

return false;

if (Double.doubleToLongBits(y) != Double.doubleToLongBits(other.y))

return false;

if (Double.doubleToLongBits(z) != Double.doubleToLongBits(other.z))

return false;

return true;

}

public double getX() {

return x;

}

public void setX(double x) {

this.x = x;

}

public double getY() {

return y;

}

public void setY(double y) {

this.y = y;

}

public double getZ() {

return z;

}

public void setZ(double z) {

this.z = z;

}

public double getT() {

return t;

}

public void setT(double t) {

this.t = t;

}

public double getM() {

return m;

}

public void setM(double m) {

this.m = m;

}

@Override

public String toString() {

return "Point [x=" + x + ", y=" + y + ", z=" + z + ", t=" + t + ", m=" + m + "]";

}

Point() {x = 0;y=0;z=0;t=0;m=0;}

Point( double a, double b, double c, double d, double e) {x = a;y=b;z=c;t=d;m=e;}

public void input() {

Scanner keyin = new Scanner(System.in);

System.out.println("x=:");

x = keyin.nextDouble();

System.out.println("y=:");

y = keyin.nextDouble();

System.out.println("z=:");

z = keyin.nextDouble();

System.out.println("m=:");

m = keyin.nextDouble();

System.out.println("t=:");

t = keyin.nextDouble();

}

public   void display() {

System.out.println(toString());

}

public static void Move(Point p1,Point p2)

{double x=p1.getX() -p2.getX(),

y=p1.getY() -p2.getY(),

z=p1.getZ() -p2.getZ(),

t=p1.getT()-p2.getT(),

Dist = Math.sqrt(x*x+y*y+z*z),

Speed = Dist/t;

System.out.println("p1--->p2's movespeed and  coordinate vectorsis :"+Dist/t+"("+x+","+y+","+z+","+z+")");

}

public  static void  Dist(Point p1,Point p2)

{

double  x=p1.getX() -p2.getX(),

y=p1.getY() -p2.getY(),

z=p1.getZ() -p2.getZ(),

Dist = Math.sqrt(x*x+y*y+z*z);

System.out.println("p1--->p2's distance is :"+Dist);

}

public static void  Gravi(Point p1,Point p2)

{

double Gra = p1.getM()*p2.getM()/ (p1.getX() -p2.getX()+p1.getY() -p2.getY()+p1.getZ() -p2.getZ());

  System.out.println("p1--->p2's gravitation is :"+Gra);

}

public  static String  getDesigner() {

String content  ="设计者：[]  学号：[] 班级：[]";

return content;

}

public static void main(String[] args)

{

System.out.println(Point.getDesigner());

Point p1 =  new Point();

Point p2 =  new Point();

System.out.println("Please input the first partical's property :");

p1.input();

System.out.print("The first partical is :");

p1.display();

System.out.println("Please input the second partical's property  :");

p2.input();

System.out.print("The second partical is :");

p2.display();

System.out.println("p1==p2="+(p1==p2));

System.out.println("p1.equals(p2)="+p1.equals(p2));

Point.Move(p1,p2);

Point.Dist(p1,p2);

Point.Gravi(p1,p2);

}

}