java 学生对象数组

Posted 2022-07-04 DQ_CODING

题目

代码

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) 
//        对象数组
        Student[] students = new Student[NUM];
        for (int i = 0; i < NUM; i++) 
//            给数组元素赋值
            students[i] = new Student();
//            给Student对象的属性赋值
            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();
//        查找学生信息
        student.searchState(students, 3);
//        冒泡排序
        student.bubbleSort(students);
        student.print(students);
    

    //    查找学生信息
    public void searchState(Student[] students, int state) 
        System.out.println(state + "年纪的学生信息：");
        for (Student s :
                students) 
            if (s.state == state) 
                System.out.print(s.toString() + "\\n");
            
        
    

    //    打印数组
    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;
                
            

        
    

    //交换
    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;
    

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

内存解析