JAVA程式求助...

Question

public class student{
    public string number;
    public string name;
    public int age;
    public int[] score;
    public void setNumber(string number){
        this.number=number;
    }
    public void setName(string name){
        this.number=name;
    }
    public void setAge(int Age){
        this.age=age;
    }
    public void setScore(int[] score){
        this.score=score;
    }
    public String getNumber(){
        return number;
    }
    public String getNumber(){
        return name;
    }
    public int getAge(){
        return age;
    }
    public int[] getScore(){
        return score;
    }
    public int getScoreTotal(){
        int total=0;
        for(int a:score){
             total+=a;
        }
        return total;
    }
    public float getScoreTotal()/5.of;
    }
    public Student(){
        this("A0000","Guest",18,new int{5});
    }
    public Student(String number,String name,int age,int[] score){
        setNumber(number);
        setName(name);
        setAge(age);
        setScore(score);
    }
    public static void main(String[] args){
         Student s=new Student();
         System.out.println(s.getNumber()+"&#92;t"+s.getName()+"&#92;t"+s.getAge()+"&#92;t"+s.getScoreAve());
         }
    }
--------------------------------------------------------------------------------------------
1.改以Constructor來設定資料成員資料
2.利用陣列設定五位學生資料
3.定義一個以平均分數做為排序依據的方法
4.定義一個輸出學生資料(學號.姓名.五科成績.平均分數)的方法
5.將排序後的學生資料輸出(呼叫4.5次)
6.執行時輸入(學號)欲尋找的學生後,將找到之學生資料輸出(含平均分數)
要改成以上六點.....有誰會??????

生鏽 · Accepted Answer

先宣告兩種排序方法：

import java.util.Comparator;

public class StudentOrderByScore implements Comparator<Student> {

public int compare(Student arg0, Student arg1) {

if(arg0.getAverageScore() < arg1.getAverageScore())

return -1;

else if(arg0.getAverageScore() > arg1.getAverageScore())

return 1;

return 0;

}

以及

import java.util.Comparator;

public class StudentOrderByNumber implements Comparator<Student> {

public int compare(Student arg0, Student arg1) {

return(arg0.getNumber().compareTo(arg1.getNumber()));

}

Student 類別：

import java.io.*;

import java.util.*;

public class Student implements Comparator<Student> {

public String number;

public String name;

public int age;

public int[] score;

public String getNumber(){

return number;

}

public void setNumber(String number){

this.number=number;

}

public String getName(){

return name;

}

public void setName(String name){

this.name=name;

}

public int getAge(){

return age;

}

public void setAge(int age){

this.age = age;

}

public int[] getScore(){

return score;

}

public void setScore(int[] score){

this.score=score;

}

public int getTotalScore(){

int total=0;

for(int a:score)

total+=a;

return total;

}

public float getAverageScore(){

int total = getTotalScore();

return (float)total / (float)score.length;

}

public Student() {

}

public Student(String number,String name,int age,int[] score){

setNumber(number);

setName(name);

setAge(age);

setScore(score);

}

public int compare(Student arg0, Student arg1)

{

if(arg0.getAverageScore() < arg1.getAverageScore())

return -1;

else if(arg0.getAverageScore() > arg1.getAverageScore())

return 1;

return 0;

}

2008-03-31 13:57:22 補充：

public static void main(String[] args){

Student[] students = new Student[5]; // declare an array to store 5 students' data

// create the 5 students false data

students[0] = new Student("10003", "student 3", 19, new int[] {30, 40, 50, 60, 70});

2008-03-31 13:58:05 補充：

students[1] = new Student("10005", "student 5", 21, new int[] {50, 60, 70, 80, 90});

students[2] = new Student("10001", "student 1", 17, new int[] {10, 20, 30, 40, 50});

students[3] = new Student("10004", "student 4", 20, new int[] {40, 50, 60, 70, 80});

2008-03-31 13:58:25 補充：

students[4] = new Student("10002", "student 2", 18, new int[] {20, 30, 40, 50, 60});

// sort by average score and output

Comparator comparator = new StudentOrderByScore();

Arrays.sort(students, comparator);

2008-03-31 13:58:50 補充：

System.out.println("Number\tName\tAge\tTotal\tAverage");

for(Student s : students)

System.out.println(s.getNumber()+"\t"+s.getName()+"\t"+s.getAge()+"\t"+s.getTotalScore()+"\t"+s.getAverageScore());

// sort by number

comparator = new StudentOrderByNumber();

2008-03-31 13:59:25 補充：

Arrays.sort(students, comparator);

// read the number

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

try {

System.out.print("Enter the student number: ");

String number = reader.readLine();

2008-03-31 14:00:21 補充：

Student key = new Student();

key.setNumber(number);

int index = Arrays.binarySearch(students, key, comparator);

if(index >= 0) {

Student s = students[index];

System.out.println(s.getNumber()+"\t"+s.getName()+"\t"+s.getAge()+"\t"+s.getTotalScore()+"\t"+s.getAverageScore());

}

2008-03-31 14:00:48 補充：

else {

System.out.println("Not found!!!");

}

} catch (IOException e) {

e.printStackTrace();

}

2008-03-31 14:01:55 補充：

知識+ 把倒斜線 t 都轉為 \t，請自己再轉回來。

2008-04-01 16:42:46 補充：

倒斜線 t 是定位符號，知識+ 在補充內容時無法輸入倒斜線，所以請你把上面的程式碼自行換回來倒斜線。

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JAVA程式求助...

1 Answer