5.3JAVA面向对象笔记

package ketangbiji.time503;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;

public class DemoClass {
    public static void main(String[] args) {
        List list = new ArrayList();
        
        list.add(1);
        list.add(3.3);
        list.add('A');
        list.add("鲁班");
        list.add(true);
        list.add(new Student("鲁班","123"));
        
        for(Object o : list) {
            if(o instanceof Student) {
                Student s = (Student) o;
                System.out.println(s.getName() + s.getId());
            }
        }
        
        List<String> list2 = new ArrayList<String>();
        list2.add("鲁班");
        list2.add("妲己");
        for(String s : list2) {
            System.out.println(s);
        }
        
        LinkedList<Student> students = new LinkedList<Student>();
        students.add(new Student("关羽","222"));
        students.add(new Student("张飞","333"));
        
        for(int i = 0; i < students.size(); i++) {
            System.out.println(students.get(i).getName() + students.get(i).getId());
        }
        
        HashMap<String, String> map = new HashMap<String, String>();
        map.put("豫", "河南省");
        map.put("鲁", "山东省");
        map.put("京", "北京市");
        
        map.forEach((key, value) ->{
            System.out.println(key + value);
        });
        
        HashMap<String, List<String>> maps = new HashMap<String, List<String>>();
        List<String> students11 = new ArrayList<String>();
        students11.add("鲁班");
        maps.put("软件14班", students11);
    }
}

package ketangbiji.time503;

public class Student {
    private String name;
    private String id;
    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 Student(String name, String id) {
        super();
        this.name = name;
        this.id = id;
    }
}