实习第一天：java面向对象

package com.array;



//学生类
public class Student {
    public int number;//学号
    public int state;//年级
    public int score;//成绩

//显示学生信息的方法
    public String info(){
       return "学号：" +number+",年级："+state+",成绩："+score;
    }
}


//测试类
package com.array;


public class StudentTest {
    public static void main(String[] args) {
        //创建20个学生对象
        Student[] s = new Student[20];

        for (int i = 0; i < s.length; i++) {
            //给元素赋值
            s[i] = new Student();
            //给Student对象的属性赋值
            s[i].number = (i + 1);
            s[i].state = (int) (Math.random() * (6 - 1 + 1) + 1);
            s[i].score = (int)(Math.random()*(100-0+1));
        }

        System.out.println("----------------");

        //打印三年级的学生信息
        for (int i = 0; i s[j+1].score) {
                    //如果需换序，交换的是数组元素，Student对象
                    Student temp = s[j];
                    s[j] = s[j+1];
                    s[j+1] = temp;
                }
            }
        }
        //遍历学生数组
        for (int i = 0; i < s.length; i++) {

            System.out.println(s[i].info());
        }
    }
}