JAVA高级特性与实战项目第一章集合框架课后作业

4.创建一个类，代表队列 添加add（）及get（）方法
package frame_set;

public class Dog {
	private String name;
	private String varieties;

	String getName() {
		return name;
	}
	private void setName(String name) {
		this.name = name;
	}
	String getVarieties() {
		return varieties;
	}
	private void setVarieties(String varieties) {
		this.varieties = varieties;
	}
	public Dog(String name, String varieties) {
		super();
		this.name = name;
		this.varieties = varieties;
	}

}
package frame_set;

import java.util.LinkedList;

public class Testdog {

	public static void main(String[] args) {
		Dog dog1= new Dog("团团", "泰迪");
		Dog dog2= new Dog("喜喜", "雪瑞拉");
		Dog dog3= new Dog("乐乐", "哈奇士");
		Dog dog4= new Dog("圆圆", "泰迪");
		LinkedList<Dog> dogs = new LinkedList<Dog>();
		dogs.add(dog1);
		dogs.add(dog2);
		dogs.addFirst(dog3);
		dogs.addLast(dog4);
		Dog dogFirst =(Dog)dogs.getFirst();
		System.out.println("第一条狗的昵称是"+dogFirst.getName());
		
		Dog dogLast =(Dog)dogs.getLast();
		System.out.println("最后一条狗的昵称是"+dogLast.getName());
		
		dogs.removeFirst();
		dogs.removeLast();
		
		System.out.println("删除后还有"+dogs.size()+"条狗。"+"\n分别是：");
		for (Dog dog : dogs) {
			System.out.println(dog.getName()+"\t"+dog.getVarieties());
		}
	}

}
5使用HashMap添加学员的姓名和成绩
package frame_set;

public class Student {
	String name;
	int score;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getScore() {
		return score;
	}
	public void setScore(int score) {
		this.score = score;
	}
	public Student(String name, int age) {
		super();
		this.name = name;
		this.score = age;
	}
	

}
package frame_set;

import java.util.HashMap;
import java.util.Map;

public class TestStudent {

	public static void main(String[] args) {
		Student stu1 = new Student("张三", 80);
		Student stu2 = new Student("李四", 88);
		Student stu3 = new Student("王五", 90);
		Student stu4 = new Student("赵六", 98);
		Student stu5 = new Student("田七", 100);
		Map<String, Integer> student = new HashMap<String, Integer>();
		student.put("张三", 80);
		 student.put("李四", 88);
		 student.put("王五", 90);
		 student.put("赵六", 98);
		 student.put("田七", 100);
		 for (String key : student.keySet()) {
			
		System.out.println(key+student.get(key));
		}
		 stu1 = new Student("张三", 100);
		 stu2 = new Student("李四", 99);
		 student.put("张三", 100);
		 student.put("李四", 99);
		 
		 System.out.println("********************");
		 for (String key : student.keySet()) {
				
		System.out.println(key+student.get(key));
		}
	}

}