2020.8.12

一、今日学习内容

 

 1 public class Complex {
 2     private double real,imag;
 3     public  void setvalue(double a,double b) {
 4         real=a;
 5         imag=b;
 6     }
 7     public double getReal() {
 8         return real;
 9     }
10     public double getImag() {
11         return imag;
12     }
13     public void display() {
14         System.out.print(real);
15         if(imag>0)
16             System.out.println("+"+imag+"i");
17         else
18             System.out.println(imag+"i");
19     }
20     public Complex conjugate() {
21         Complex c=new Complex();
22         c.real=real;
23         c.imag=-1*imag;
24         return c;
25     }
26     public static void main(String[] args) {
27         Complex con=new Complex();
28         Complex con1=new Complex();
29         con.setvalue(3.2, 5.6);
30         System.out.println("复数的实部为:"+con.getReal());
31         System.out.println("复数的虚部为:"+con.getImag());
32         System.out.print("复数为:");
33         con.display();
34         con1=con.conjugate();
35         System.out.print("该复数的共轭复数为:");
36         con1.display();
37     }
38 }

       

  1、学生类

 1 import java.util.Scanner;
 2 public class Student1 {
 3     private int age;
 4     private String name;
 5     public void Input(int a,String n) {
 6         age=a;
 7         name=n;
 8     }
 9     public void Output() {
10         System.out.println("姓名:"+name+"\t"+"年龄:"+age);
11     }
12     public static void main(String[] args) {
13         Student1[] stu=new Student1[3];
14         Scanner con=new Scanner(System.in);
15         for(int i=0;i<3;i++) {
16             stu[i]=new Student1();
17             System.out.println("请输入第"+(i+1)+"位同学信息(姓名、年龄):");
18             stu[i].name=con.next();
19             stu[i].age=con.nextInt();
20             stu[i].Input(stu[i].age, stu[i].name);
21         }
22         for(int i=0;i<3;i++) {
23             System.out.print("第"+(i+1)+"位同学:");
24             stu[i].Output();
25         }
26     }
27 }

 2、点类

 1 import java.util.Scanner;
 2 public class Point1 {
 3     private float x,y,z;
 4     public void Input() {
 5         Scanner con=new Scanner(System.in);
 6         System.out.println("请输入坐标(x、y、z):");
 7         x=con.nextFloat();
 8         y=con.nextFloat();
 9         z=con.nextFloat();
10     }
11     public float getX() {return x;}
12     public float getY() {return y;}
13     public float getZ() {return z;}
14     public void Output() {
15         System.out.println("坐标为:("+x+","+y+","+z+")");
16     }
17     public static void main(String[] args) {
18         Point1 p=new Point1();
19         p.Input();
20         p.Output();
21         System.out.println("横坐标为:"+p.getX());
22         System.out.println("纵坐标为:"+p.getY());
23         System.out.println("竖坐标为:"+p.getZ());
24     }
25 }

  3、线段类

 1 import java.lang.Math;
 2 public class Line1 {
 3     private Point1 p1=new Point1();
 4     private Point1 p2=new Point1();
 5     public void Input() {
 6         System.out.println("请输入线段的起点和终点坐标:");
 7         p1.Input();
 8         p2.Input();
 9     }
10     public void display() {
11         double d;
12         d=Math.sqrt((p1.getX()-p2.getX())*(p1.getX()-p2.getX())+(p1.getY()-p2.getY())*(p1.getY()-p2.getY())+(p1.getZ()-p2.getZ())*(p1.getZ()-p2.getZ()));
13         System.out.printf("线段的长度为:%-9.4f",d);
14     }
15 
16     public static void main(String[] args) {
17         Line1 l=new Line1();
18         l.Input();
19         l.display();
20     }
21 }

 

二、遇到的问题

        无。

三、明日计划

   明天开始PPT第四讲的验证。