3月29日

1、定义学生类Student ，属性：姓名，学号，年龄，成绩
提供：无参和全参构造器，生成get和set方法，重写toString ，equals ,hashCode

使用全参构造器创建3个学生对象，放入集合中

使用对象流将这个学生集合写入到本地

使用对象流从本地文件把学生信息读出来，并打印

package com.qiku.day22;
import java.io.Serializable;
import java.util.Objects;
public class Student implements Serializable {
    private String name;
    private String id;
    private int age;
    private double score;

    public Student() {
    }

    public Student(String name, String id, int age, double score) {
        this.name = name;
        this.id = id;
        this.age = age;
        this.score = score;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", id='" + id + '\'' +
                ", age=" + age +
                ", score=" + score +
                '}';
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Student student = (Student) o;
        return age == student.age && Double.compare(student.score, score) == 0 && Objects.equals(name, student.name) && Objects.equals(id, student.id);
    }
    @Override
    public int hashCode() {return Objects.hash(name, id, age, score);}
    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 int getAge() {return age;}
    public void setAge(int age) {this.age = age;}
    public double getScore() {return score;}
    public void setScore(double score) {this.score = score;}
}

package com.qiku.day22;
import java.io.*;
import java.util.ArrayList;
import java.util.List;
public class Zuo01 {
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        Student stu1 = new Student("一号", "01", 18, 80);
        Student stu2 = new Student("二号", "02", 19, 90);
        Student stu3 = new Student("三号", "03", 20, 100);
        List<Student> list1 = new ArrayList<>();
        list1.add(stu1);
        list1.add(stu2);
        list1.add(stu3);
        FileOutputStream fos = new FileOutputStream("student.txt");
        ObjectOutputStream oos = new ObjectOutputStream(fos);
        oos.writeObject(list1);
        oos.close();
        FileInputStream fis = new FileInputStream("student.txt");
        ObjectInputStream ois = new ObjectInputStream(fis);
        Object o = ois.readObject();
        List<Student> list2 ;
        if (o instanceof List) {
            list2 = (List)o;
            for (Student stu : list2) {
                System.out.println(stu);
            }
        }
    }
}

2、分别使用继承，实现接口，匿名内部类的方式创建线程，并启动
自己定义线程的run方法，并体会线程的执行过程

package com.qiku.day22;

public class Zuo02 {
    public static class JC extends Thread {
        public JC() {
        }
        public JC(String name) {
            super(name);
        }
        @Override
        public void run() {
            for (int i = 0; i < 100; i++) {
                System.out.println(this.getName() + ":" + i);
            }
        }
    }
}
class Test01 {
    public static void main(String[] args) {
        Zuo02.JC a = new Zuo02.JC();
        Zuo02.JC b = new Zuo02.JC();
        a.start();
        b.start();
    }
}

public class Zuo02 {

public static class JK implements Runnable {

    @Override
    public void run() {
        for (int i = 0; i < 100; i++) {
            System.out.println(Thread.currentThread().getName() + ":" + i);
        }
    }
  }

}
class Test02{
    public static void main(String[] args) {
        Zuo02.JK m1 = new Zuo02.JK();
        Thread a = new Thread(m1,"a");
        Zuo02.JK m2 = new Zuo02.JK();
        Thread b = new Thread(m2,"b");
        a.start();
        b.start();
    }
}

package com.qiku.day22;

public class Zuoy02 {
        public static void main(String[] args) {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    for (int i = 0; i < 100; i++) {
                        System.out.println(Thread.currentThread().getName()+":"+i);
                    }
                }
            }).start();
        }
}