Java 类和List集合 迭代器遍历练习题

1.  创建班级类(Classes)，具有两个属性：班级人数，班级名称；创建学生类(Student),具有三个属性：学生姓名，学号，所在班级(Classes类型对象)，所有属性都通过构造方法赋值，并具有相应存取器方法。在测试类中，创建存储Student类型的List，并向其添加十个学生的信息，通过迭代器，迭代该List，并将学生所在班级名称打印到控制台。

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.ListIterator;

//定义一个班级类
class Classes{
    private int count;
    private String name;
//构造方法
public Classes(int count, String name) {
        super();
        this.count = count;
        this.name = name;
    }
//getter/setter方法
public int getCount() {
    return count;
}

public void setCount(int count) {
    this.count = count;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}
}

//定义一个学生类
class Student {
    private String name;
    private String id;
    private Classes classes;
    
    public Student(String name, String id, Classes classes) {
        this.name = name;
        this.id = id;
        this.classes = classes;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getId() {
        return id;
    }
    
    public void setId(String id) {
        this.id = id;
    }

    public Classes getClasses() {
        return classes;
    }
    
    public void setClasses(Classes classes) {
        this.classes = classes;
    }
}

public class Test1_06 {
public static void main(String[] args) {

    List list = new ArrayList ();
    Classes cla = new Classes(10, "java0421");  //生成班级

    for (int i = 0; i < 10; i++) {   //循环10遍
        Student s = new Student(""+i, i+"", cla);  //生成学生
        list.add(s);  //添加学生 
    }
    
    //通过迭代器，迭代该list集合
    for(ListIterator it = list.listIterator();it.hasNext();) {
        Object obj = it.next();
        if (obj instanceof Student) {
            Student s = (Student) obj;
            System.out.println(s.getClasses().getName());
        }
    }
 }
}