狄慧201771010104《面向对象程序设计（java）》第四周学习总结

mport java.io.*;
 import java.util.*;
 public class FileWriteReadTest {
       public static void main(String[] args) throws IOException{
              //写入文件演示
             PrintWriter out = new PrintWriter("myfile.txt");
              out.println("姓名 高数 Java 数据结构 平均成绩 总成绩");
              out.println("张三 20 30 40 0 0");
              out.println("李四 50 60 70 0 0");
              out.close();//输出完毕，需要close
              //读入文件演示
              Scanner in = new Scanner(new File("myfile.txt"));//为myfile.txt这个File创建一个扫描器in
              int number = 1;//行号
              System.out.println(in.nextLine());
              while(in.hasNextLine()){//判断扫描器是否还有下一行未读取，该循环把文件的每一行都读出
                     String line = in.nextLine();//读出myfile.txt的下一行
                     System.out.print("第"+(++number)+"行的内容: ");              
                     Scanner linescanner = new Scanner(line);//行内容建立扫描器
                     linescanner.useDelimiter(" ");//使用空格作为分隔符
                     String name = linescanner.next();
                     String math = linescanner.next();
                     String java = linescanner.next();
                     String ds = linescanner.next();
                     String avg = linescanner.next();
                     String total = linescanner.next();
                     System.out.println("name="+name+"  math="+math+"  java="+java+"  ds="+ds+"  avg"+avg+"  total="+total);
              }
              in.close();//读入完毕，最后需要对其进行close。
       }    
}

1  import java.util.Scanner;
 2 public class StudentTest
 3 {
 4   @
 5 public static void main(String[] args)
 6    {
 7       Student[] staff = new Student[2];
 8       System.out.println("请输入学生的信息");
 9      
10       Scanner in = new Scanner(System.in); 
11       for(int i=0;i) {
12           staff[i]=new Student(in.next(),in.next(),in.nextInt());
13       }
14       System.out.println("name"+" "+"sex"+" "+"javascore");
15 
16       for (Student e : staff)
17          System.out.println(e.getName() +"    "+e.getSex()+"          "+e.getJavaScore());
18    }
19 }
20 
21 class Student
22 {
23    private String name;
24    private String sex;
25    private int javascore;
26 
27    public Student(String n, String s, int j)
28    {
29       name = n;
30       sex = s;
31       javascore =j;
32    }
33 
34    public String getName()
35    {
36       return name;
37    }
38 
39    public String getSex()
40    {
41       return sex;
42    }
43 
44    public int getJavaScore()
45    {
46       return javascore;
47    }
48   }

1 package four;
 2 import java.util.Scanner;
 3 public class 实验3 {
 4 @SuppressWarnings("resource")
 5 /**
 6  * This program is the circumference and area of rectangles and circles.
 7  * time 2018 9 24
 8  * @author dihui
 9  */
10 public static void main(String[] args) {
11     Scanner sc = new Scanner(System.in);
12     System.out.println("请输入矩形的x y："); 
13     int x = sc.nextInt();
14     int y = sc.nextInt();
15     System.out.println("矩形周长 "+Perimeter.getPerimeter(x,y));
16     System.out.println("矩形面积"+Area.getArea(x,y));
17     
18     System.out.println("请输入圆的r："); 
19     int r = sc.nextInt();
20     System.out.println("圆周长 "+Perimeter.getPerimeter(r));
21     System.out.println("圆面积"+Area.getArea(r));
22     
23     double c = Perimeter.getPerimeter(x,y)+Perimeter.getPerimeter(r);
24     double s = Area.getArea(x,y)+Area.getArea(r);
25     System.out.println("矩形与圆的周长和为："+c);
26     System.out.println("矩形与圆的面积和为："+s);
27 
28  }
29 }
30 class Perimeter{
31     public static double getPerimeter(double width, double height) {
32         return 2*(width + height);
33     }
34 
35     public static double getPerimeter(int r) {
36         return 2*3.14*r;
37     }
38     
39 }
40 class Area{
41     public static double getArea(double width, double height){
42         return width * height;
43  }
44 
45     public static double getArea(int r) {
46         return 3.14*r*r;
47     }
48 }