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java学习笔记之方法(五)

福福福福福福福福福 2022-04-16 阅读 56
java

方法练习4

public class fangfalianxi4 {
    public static void main(String[] args) {
//    声明一个student数组
        Student[] stus = new Student[20];
        for (int i = 0; i < stus.length; i++) {
//            给数组元素赋值
            stus[i] = new Student();
//            给属性赋值
            stus[i].number = i + 1;
//          年级1-6
            stus[i].state = (int) (Math.random() * (6 - 1 + 1) + 1);
//            成绩0-100
            stus[i].score = (int) (Math.random() * (100 - 0 + 1) + 0);
        }
//        遍历学生对象
        for (int i = 0; i < stus.length; i++) {
            System.out.println(stus[i].info());
//            System.out.println(stus[i].state+"  "+stus[i].score+"  "+stus[i].number);
        }
//      打印出3年级学生信息
        System.out.println("--------------");
        for (int i = 0; i < stus.length; i++) {
            if (stus[i].state == 3) {
                System.out.println(stus[i].info());
            }
        }

//      冒泡排序并且按照成绩遍历
        for (int i = 0; i < stus.length - 1; i++) {
            for (int j = 0; j < stus.length - 1 - i; j++) {
                if (stus[j].score > stus[j + 1].score) {
//                  交换的是数组对象
                    Student temp = stus[j];
                    stus[j] = stus[j + 1];
                    stus[j + 1] = temp;
                }
            }
        }
        System.out.println("--------------");
        for (int i = 0; i < stus.length; i++) {

                System.out.println(stus[i].info());

        }


    }

}

class Student {
    int number;//学号
    int state;//年级
    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;
    }

}
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