自定义学生类:包含姓名,年龄,成绩属性.私有成员变量,生成无参,有参构造方法,生成get/set方法.
创建5个学生放到ArrayList中.使用迭代器获取每个学生信息.统计总分,平均分,最高分,最低分并输出
[Java] 纯文本查看 复制代码 //自定义学生类:包含姓名,年龄,成绩属性.私有成员变量,生成无参,有参构造方法,生成get/set方法.
public class Student {
//姓名
private String name;
//年龄
private int age;
//成绩
private int score;
public Student() {
// TODO Auto-generated constructor stub
}
public Student(String name, int age, int score) {
super();
this.name = name;
this.age = age;
this.score = score;
}
//get/set
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 class Test {
private static final String ArrayList = null;
public static void main(String[] args) {
// 创建scanner对象
Scanner sc = new Scanner(System.in);
// 创建ArrayList集合
Collection<Student> coll = new ArrayList<Student>();
// 控制台循环输入
for (int i = 0; i < 5; i++) {
System.out.println("请输入第" + (i + 1) + "个学生姓名:");
String name = sc.next();
System.out.println("请输入第" + (i + 1) + "个学生年龄:");
int age = sc.nextInt();
System.out.println("请输入第" + (i + 1) + "个学生成绩:");
int score = sc.nextInt();
// 学生对象添加到集合
coll.add(new Student(name, age, score));
}
// 创建迭代器
Iterator<Student> it = coll.iterator();
// 遍历集合
while (it.hasNext()) {
Student stu = it.next();
// 打印学生信息
System.out.println("姓名: " + stu.getName() + " 年龄: " + stu.getAge() + " 成绩: " + stu.getScore());
}
// coll向下转型
ArrayList<Student> arr = (ArrayList<Student>) coll;
// 成绩最高分
int maxScore = arr.get(0).getScore();
// 成绩最低分
int minScore = arr.get(0).getScore();
// 成绩和
int sumScore = 0;
// 循环遍历集合
for (int i = 1; i < coll.size(); i++) {
if (maxScore < arr.get(i).getScore())
maxScore = arr.get(i).getScore();
if (minScore > arr.get(i).getScore())
minScore = arr.get(i).getScore();
sumScore += arr.get(i).getScore();
}
// 成绩平均分
int avgScore = sumScore / (arr.size());
System.out.println("成绩最高分为: " + maxScore);
System.out.println("成绩最低分为: " + minScore);
System.out.println("成绩平均分为: " + avgScore);
}
} | 
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