week6:class

Problem 1:School

1.define 'Class Student'

2.Define 'five student' using "Constructor' in Student[]

Name	x	y	Score	Sex
G-Drangon	23	22	85	Boy
Naruto	66	35	75	Boy
Dva	33	46	80	Girl
Teemo	14	55	95	Boy
Sona	87	75	100	Girl

3.Define 'respones() method'.which print name + 'Yes'

Ex1)Dva Yes

 

1.Define ‘callStudents(Student[], value) method’

2.can call students conditionally. (It should use ‘response()’ in student class)

//Ex)(95 →the student`s score >= 95) callStudent(students, 95)  //print) Teemo Yes  Sona Yes

Problem 1:School(using static)

1.Define ‘numStudents()’ in student class 

//Ex)Student Genji = new Student(“Genji”, 32, 15, 80, “Boy”);   Student Sombra = new Student(“Sombra”,15, 90, 85, “Girl”); Genji.numStudents()Sombra.numStudents() //Print)      2       2

Problem 2: shortestDistanceStudent()

 

1.Input N 

2.N size of students array, so there are N students 

- x,y,Score → random value 

Name : Student1  ~  StudentN 

x : 0 ~ 100                             // double, using Math.random()  

y : 0 ~ 100                             // double, using Math.random()  

Score : 0 ~ 100                        // double, using Math.random() 

Sex : Boy or Girl                       // 50%, using Math.random() 

3.Define printStudents(students[]) : print all informatin of students 

(hint: use System.out.printf(“%.2f”,x)) 

4.Define shortestDistanceStudents(students[]) :  

print the two students closest to each other

import java.util.Scanner;
 
class Student{
    String name;
    double x;
    double y;
    double score;
    String sex;
    static int NumStudents;
    Student(String myname, double myx, double myy, double myscore, String mysex ){
        name = myname;
        x = myx;
        y = myy;
        score = myscore;
        sex = mysex;
        NumStudents +=1;
        
    }
    void response() {
        System.out.println(name + " Yes");
        
    }
    void numStudents() {
        
        System.out.println(NumStudents);
        
    }
}
public class School {
    static void callStudent(Student mystudent[] ,int checkscore) {
        for(int i=0; i<5; i++) {
            if(mystudent[i].score>=checkscore) {
                mystudent[i].response();
            }
        }
    }
    static void printStudents(Student mystudent[]) {
        for(int i=0;i<mystudent.length;i++) {
            System.out.print(mystudent[i].name+" ");
            System.out.printf("%.2f ",mystudent[i].x);
            System.out.printf("%.2f ",mystudent[i].y);
            System.out.printf("%.2f ",mystudent[i].score);
            System.out.println(mystudent[i].sex);
        }
        
    }
    static void shortestDistanceStudent(Student mystudent[]){
        double maxdistance = 1000000000;
        int maxi=0, maxj=0;
        for(int i=0; i<mystudent.length; i++) {
            for(int j=0; j<mystudent.length;j++) {
                if(i == j) {
                    continue;
                }
                double distance = (mystudent[i].x-mystudent[j].x) * (mystudent[i].x-mystudent[j].x) + (mystudent[i].y-mystudent[j].y)*(mystudent[i].y - mystudent[j].y);
                if(distance < maxdistance){
                    maxdistance = (mystudent[i].x-mystudent[j].x) * (mystudent[i].x-mystudent[j].x) + (mystudent[i].y-mystudent[j].y)*(mystudent[i].y - mystudent[j].y);
                    maxi= i;
                    maxj=j;
                }
            }
        }
        System.out.println(mystudent[maxi].name+" and "+mystudent[maxj].name);
        
    }
    public static void main(String args[]) {
        Student student[] = new Student[5];
        student[0] = new Student("G-Dragon", 23, 22, 85, "Boy");
        student[1] = new Student("Naruto", 66, 35, 75, "Boy"); 
        student[2] = new Student("Dva", 33, 46, 80, "Girl"); 
        student[3] = new Student("Teemo", 14, 55, 95, "Boy"); 
        student[4] = new Student("Sona", 87, 75, 100, "Girl");
        
        Scanner InputNum = new Scanner(System.in);
        int N = InputNum.nextInt();
        Student lovelystudent[] = new Student[N];
        for(int i=0;i<N;i++) {
            lovelystudent[i] = new Student("Student"+(i+1),Math.random()*100,Math.random()*100,Math.random()*100,Math.random()<0.5?"Girl":"Boy");
        }
        printStudents(lovelystudent);
        shortestDistanceStudent(lovelystudent);
        
    }
        
}
 

School.java