集合练习：根据学院英文名找到学员对象

包装学生类：

/**
 * @author Administrator
 *    学生类
 */
public class Students {
    private String name;
    private char sex;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public char getSex() {
        return sex;
    }
    public void setSex(char sex) {
        this.sex = sex;
    }
    public Students(String name, char sex) {
        super();
        this.name = name;
        this.sex = sex;
    }
}

测试类：

import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;

public class Text01 {
    static Scanner input= new Scanner(System.in);
    public static void main(String[] args) {
        Map<String, Students> student = new HashMap<String, Students>();
        student.put("Jack0", new Students("张三", '男'));
        student.put("Jack1", new Students("李四", '女'));
        student.put("Jack2", new Students("王五", '男'));
        student.put("Jack3", new Students("赵六", '女'));
        student.put("Jack4", new Students("钱七", '男'));
        
        Set<String> keys = student.keySet();
        //遍历方法一:增强型for循环
        for(String st:keys) {
            Students value = student.get(st);
            System.out.println(st+"---"+value.getName()+"---"+value.getSex());
        
        
            }
        System.out.println("*****************************************");
        //遍历方法二：迭代器Iterator
            Iterator<String> it = keys.iterator();
            while(it.hasNext()) {
                String key1 = it.next();
                Students value1 = student.get(key1);
                System.out.println(key1+"---"+value1.getName()+"---"+value1.getSex());
        }
            
        //遍历方法三：键值对获取
            System.out.println("*****************************************");
            for(Map.Entry<String, Students> map:student.entrySet()) {
                String key = map.getKey();
                Students stu = map.getValue();
                System.out.println(key+"---"+stu.getName()+"---"+stu.getSex());
            }
            
            
        System.out.println("您输入您要找的学员的英文名：");
        String name = input.next();
        if(student.containsKey(name)) {
            Students stu = student.get(name);
            System.out.println("您要找的英文名是"+name+"的学员中文名是："+stu.getName()+"    性别为："+stu.getSex());
        }else {
            System.out.println("很抱歉，没有英文名是"+name+"的学员。");
        }
    }
}

运行测试结果：