参数类表求助 - 黑马程序员技术交流社区

package test;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.TreeMap;
class Student {
private String name;
private int age;
Student(String name, int age) {
this.name = name;
this.age = age;
}
public String toStrint() {
return name + ":::" + age;
}
}
class xuexiao {
TreeMap<String, ArrayList<Student>> xuexiao = null;//学校
ArrayList<Student> yiban = null;//一班
ArrayList<Student> erban = null;//二班
/**
* 初始化学校、班级数据
*/
public void xuexiao1() {
xuexiao = new TreeMap<String, ArrayList<Student>>();
yiban = new ArrayList<Student>();
erban = new ArrayList<Student>();
xuexiao.put("yiban", yiban);
xuexiao.put("erban", erban);
yiban.add(new Student("zhangsan", 12));
yiban.add(new Student("zhangsan", 13));
yiban.add(new Student("zhangsan", 14));
erban.add(new Student("wangwu", 23));
erban.add(new Student("wangwu", 24));
erban.add(new Student("wangwu", 22));
}
/**
* 放入学校、班级名称，输出该班级学生列表
*
* @param xuexiao
* @param banji
* @return
*/
public void getStudent(TreeMap<String, ArrayList<Student>> xuexiao,
String banji) {
Iterator<String> it = xuexiao.keySet().iterator();
while (it.hasNext()) {
//遍历集合
String s = it.next();
// 如果班级名相同
if (s.equals(banji)) {
System.out.println("班级名是：" + s);
ArrayList<Student> ss = xuexiao.get(s);//当前班级人员集合
Iterator<Student> itr = ss.iterator();
while (itr.hasNext()) {//遍历班级人员
Student sss = itr.next();
System.out.println("该班学生的信息："+sss.toStrint());
}
}
}
}
}
public class p {
public static void main(String[] args) {
xuexiao xx = new xuexiao();
xx.xuexiao1();//初始化
//我估计LZ应该是想这么写，所以我写个根据班级名出资料的法子
xx.getStudent(xx.xuexiao, "erban");//这方法应该这么写
}
}

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