java 學生對象數組

題目

代碼

package lesson.l10_oop;


/**
 * Illustration
 *
 * @author DengQing
 * @version 1.0
 * @datetime 2022/7/1 9:57
 * @function
 */
public class Student {
    int number;
    int state;
    int score;
    public static final int NUM = 20;

    public static void main(String[] args) {
//        對象數組
        Student[] students = new Student[NUM];
        for (int i = 0; i < NUM; i++) {
//            給數組元素指派
            students[i] = new Student();
//            給Student對象的屬性指派
            students[i].number = i + 1;
//            [1-9]:(_9-1+1)+1
            students[i].state = (int) (Math.random() * 9) + 1;
//            [0-100]
            students[i].score = (int) (Math.random() * 99);
        }

        Student student = new Student();
//        查找學生資訊
        student.searchState(students, 3);
//        冒泡排序
        student.bubbleSort(students);
        student.print(students);
    }

    //    查找學生資訊
    public void searchState(Student[] students, int state) {
        System.out.println(state + "年紀的學生資訊：");
        for (Student s :
                students) {
            if (s.state == state) {
                System.out.print(s.toString() + "\n");
            }
        }
    }

    //    列印數組
    public void print(Student[] students) {
        for (Student s :
                students) {
            System.out.println(s.toString());
        }
    }

    //冒泡排序
    public void bubbleSort(Student[] students) {
        System.out.println("冒泡排序：");
        for (int i = 0; i < students.length - 1; i++) {
            for (int j = 0; j < students.length - 1 - i; j++) {
                if (students[j].score > students[j + 1].score) {
                    Student temp = students[j];
                    students[j] = students[j + 1];
                    students[j + 1] = temp;
                }
            }

        }
    }

    //交換
    public void exchange(Student a, Student b) {
        a.number = a.number ^ b.number;
        b.number = a.number ^ b.number;
        a.number = a.number ^ b.number;


        a.state = a.state ^ b.state;
        b.state = a.state ^ b.state;
        a.state = a.state ^ b.state;

        a.score = a.score ^ b.score;
        b.score = a.score ^ b.score;
        a.score = a.score ^ b.score;
    }

    //列印Student
    @Override
    public String toString() {
        return "Student{" +
                "number=" + number +
                ", state=" + state +
                ", score=" + score +
                '}';
    }
}

           

記憶體解析