package com.aggregate.demo;
import com.sun.corba.se.spi.ior.IORTemplateList;
import java.util.HashSet;
import java.util.Iterator;
public class set {
    public static void main(String[] args) {
        HashSet<Object> set = new HashSet<>();
        set.add(1);
        set.add("a");//增加元素
        System.out.println(set);
        set.remove(1);//移除元素
        System.out.println(set);
        System.out.println(set.contains("a"));//判斷集合中是否存在該元素
        set.clear();//清空集合
        System.out.println(set);
        //遍歷集合
        set.add("a");
        set.add("b");
        set.add("c");
        set.add("d");
        //1.使用迭代器遍歷集合
        Iterator<Object> iterator = set.iterator();
        while (iterator.hasNext()) {
            System.out.print(iterator.next() + "\t");
        }
        System.out.println("===============");
        //2.for each迭代集合
        for (Object i : set) {
            System.out.print(i + "\t");
        }
        System.out.println("===============");
        System.out.println(set.size());//獲取元素的個(gè)數(shù)
        set.add(null);
        System.out.println(set);
        //使用泛型存相同類型的元素
        HashSet<String> set1 = new HashSet<>();
        set1.add("123");
//      set1.add(2);
    }
}

import java.util.Comparator;
import java.util.Iterator;
import java.util.TreeSet;
public class Tree {
    public static void main(String[] args) {
        TreeSet<Integer> treeSet = new TreeSet<>();
        //TreeSet自然排序
        treeSet.add(5);
        treeSet.add(1);
        treeSet.add(3);
        treeSet.add(2);
        treeSet.add(4);
        System.out.println(treeSet);
        treeSet.remove(3);
        System.out.println(treeSet);
        System.out.println(treeSet.contains(0));
        treeSet.clear();
        System.out.println(treeSet);
        Iterator<Integer> iterator = treeSet.iterator();
        while (iterator.hasNext()) {
            System.out.println(iterator.next());
        }
        System.out.println("=============");
        for (Integer i : treeSet) {
            System.out.println(i);
        }
        Person P1 = new Person(23, "張三");
        Person P2 = new Person(25, "李四");
        Person P3 = new Person(12, "王五");
        Person P4 = new Person(5, "Lucy");
        Person P5 = new Person(99, "hhhh");
        TreeSet<Person> people = new TreeSet<>(new Person());
        people.add(P1);
        people.add(P2);
        people.add(P3);
        people.add(P4);
        people.add(P5);
        for (Person i : people) {
            System.out.println(i.name + "  " + i.age);
        }
    }
}
//把person對(duì)象存到TreeSet中并且按照年齡排序
class Person implements Comparator<Person> {
    int age;
    String name;
    public Person() {
    }
    public Person(int age, String name) {
        this.age = age;
        this.name = name;
    }
    @Override
    public int compare(Person o1, Person o2) {//年齡正序排序
        if (o1.age > o2.age) {
            return 1;
        } else if (o1.age < o2.age) {
            return -1;
        } else {
            return 0;
        }
    }
}

import java.util.HashMap;
import java.util.Map;
import java.util.Set;
public class MapDemo {
    public static void main(String[] args) {
        Map<String, Integer> map = new HashMap<String, Integer>();
        map.put("b", 1);//添加數(shù)據(jù)
        map.put("c", 2);
        map.put("d", 3);
        System.out.println(map);
        System.out.println(map.get("d"));//根據(jù)key取值
        map.remove("c");
        System.out.println(map);//根據(jù)key鍵值對(duì)
        System.out.println(map.size());//map集合的長(zhǎng)度
        System.out.println(map.containsKey("a"));//判斷當(dāng)前的map集合是否包含指定的key
        System.out.println(map.containsValue(10));//判斷當(dāng)前的map集合是否包含指定的value
//        map.clear();//清空集合
        Set<String> keys = map.keySet();//可以獲取map集合的key的集合
        map.values();//獲取集合的所有value值
        //遍歷map集合,通過map.keySet();
        for (String key : keys) {
            System.out.println("key:" + key + ", value:" + map.get(key));
        }
        //通過map.entrySet();遍歷集合
        Set<Map.Entry<String, Integer>> entries = map.entrySet();
        for (Map.Entry<String, Integer> entry : entries) {
            System.out.println("key:" + entry.getKey() + ", value:" + entry.getValue());
        }
    }
}

import java.util.Map;
import java.util.TreeMap;
public class TreeMapDemo {
    public static void main(String[] args) {
        //TreeMap的自然排序是字典
        Map<Integer, String> treemap = new TreeMap<Integer, String>();
        treemap.put(4, "a");
        treemap.put(3, "b");
        treemap.put(2, "c");
        treemap.put(1, "d");
        System.out.println(treemap);
        Map<String, String> map = new TreeMap<String, String>();
        map.put("a", "a");
        map.put("c", "a");
        map.put("d", "a");
        map.put("b", "a");
        map.put("ab", "a");
        System.out.println(map);

    }
}

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
public class Test {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("a");
        list.add("c");
        list.add("d");
        list.add("f");
        list.add("b");
        System.out.println(list);
        Collections.reverse(list);//反轉(zhuǎn)List中元素的順序
        System.out.println(list);
        Collections.shuffle(list);//對(duì)list集合元素進(jìn)行順序排序
        System.out.println(list);
        Collections.sort(list);//list集合字典升序排序
        System.out.println(list);
        Student s1 = new Student(14, "張三");
        Student s2 = new Student(12, "李四");
        Student s3 = new Student(13, "王五");
        Student s4 = new Student(11, "小劉");
        List<Student> students = new ArrayList<Student>();
        students.add(s1);
        students.add(s2);
        students.add(s3);
        students.add(s4);
        for (Student student : students) {
            System.out.println(student.name + "," + student.age);
        }
        Collections.sort(students, new Student());
        System.out.println("==========");
        for (Student student : students) {
            System.out.println(student.name + "," + student.age);
        }
        Collections.swap(list, 1, 3);//將指定list集合中的i處元素和j處元素進(jìn)行交換
        System.out.println(list);
        System.out.println(Collections.max(list));
        System.out.println(Collections.min(list));
        Student max = Collections.max(students, new Student());
        Student min = Collections.min(students, new Student());
        System.out.println(max.name + ", " + max.age);
        System.out.println(min.name + ", " + min.age);
        System.out.println(Collections.frequency(list, "a"));
        System.out.println(Collections.replaceAll(list, "a", "aa"));
        System.out.println(list);
    }
}
class Student implements Comparator<Student> {
    int age;
    String name;
    public Student() {
    }
    public Student(int age, String name) {
        this.age = age;
        this.name = name;
    }
    @Override
    //根據(jù)年齡升序排序?qū)ο?
    public int compare(Student o1, Student o2) {
        if (o1.age > o2.age) {
            return 1;
        } else if (o1.age < o2.age) {
            return -1;
        } else {
            return 0;
        }
    }
}

public class Test2 {
    public static void main(String[] args) {
        A<String> a = new A<String>();
        a.setKey("rexx");
        String s = a.getKey();
        System.out.println(s);
    }
}
class A<T> {
    private T key;
    public T getKey() {
        return key;
    }
    public void setKey(T key) {
        this.key = key;
    }
}

package com.aggregate.demo;
public class Test3 {
    public static void main(String[] args) {
        B1<Object> b1 = new B1<Object>();
        B1<String> b2 = new B1<String>();
        B2 b3 = new B2();
        Cc cc = new Cc();
        cc.test("xxx");
        //泛型方法，在調(diào)用之前沒有固定的數(shù)據(jù)類型
        //在調(diào)用時(shí)，傳入的參數(shù)是什么類型，就會(huì)把泛型改成什么類型
        //也就是說，泛型方法會(huì)在調(diào)用時(shí)確定泛型具體的數(shù)據(jù)類型
        Integer integer = cc.test1(2);
        Boolean aBoolean = cc.test1(true);
    }
}
//定義泛型接口
interface IB<T> {
    T test(T t);
}
//未傳入泛型實(shí)參時(shí)，與泛型類的定義相同，在聲明類的時(shí)候，需將泛型的聲明也一起加到類中
class B1<T> implements IB<T> {
    @Override
    public T test(T t) {
        return null;
    }
}
//傳入實(shí)際參數(shù)
//如果實(shí)現(xiàn)接口時(shí)指定接口的泛型的具體數(shù)據(jù)類型
//這個(gè)類實(shí)現(xiàn)接口所有方法的位置都要泛型替換實(shí)際的具體數(shù)據(jù)類型
class B2 implements IB<String> {
    @Override
    public String test(String s) {
        return null;
    }
}
//泛型方法
class Cc {
    public void test() {
    }
    //無返回值的泛型方法
    public <T> void test(T s) {
        T t = s;
    }
    public String test1(String s) {
        return s;
    }
    //有返回值的泛型方法
    public <T> T test1(T s) {
        return s;
    }
    public void test2(String... strs) {
        for (String s : strs) {
            System.out.println(s);
        }
    }
    //形參為可變參數(shù)的泛型方法
    public <T> void test2(T... strs) {
        for (T str : strs) {
            System.out.println(str);
        }
    }

}
//帶泛型的類可以在類里面定義泛型的變量
class Dd<E> {
    private E e;
    //靜態(tài)的泛型方法
    public static <T> void test3(T t) {
        //System.out.println(this.e);
        //在靜態(tài)方法中，不能使用類定義泛型，如果要使用泛型，只能使用靜態(tài)方法自己定義的泛型
        System.out.println(t);
    }
    //在類上定義的泛型，可以在普通的方法中使用
    public <T> void test(T s) {
        System.out.println(this.e);
        T t = s;
    }
}

public class Test5 {
    public static void main(String[] args) {
        //Season.SPRING,這段執(zhí)行就是獲取一個(gè)Season的對(duì)象
        Season spring = Season.SPRING;
        spring.showInfo();
        Season summer = Season.SUMMER;
        summer.showInfo();
        Season spring1 = Season.SPRING;
        //每次執(zhí)行Season.SPRING獲得是相同的對(duì)象，枚舉類中的每個(gè)枚舉都是單例模式的
        System.out.println(spring.equals(spring1));
        spring1.test();
    }
}
enum Season implements ITest {
    SPRING("春", "春暖花開"),//此處相當(dāng)于調(diào)用有參的私有構(gòu)造
    SUMMER("夏", "夏日炎炎"),
    AUTUMN("秋", "秋高氣爽"),
    WINTER("冬", "寒風(fēng)凜冽");

    private final String name;
    private final String desc;
    Season(String name, String desc) {
        this.name = name;
        this.desc = desc;
    }
    public void showInfo() {
        System.out.println(this.name + ":" + this.desc);
    }
    @Override
    public void test() {
        System.out.println("這是實(shí)現(xiàn)的ITest接口的test方法");
    }
}

interface ITest {
    void test();
}

import java.lang.annotation.*;
import java.util.ArrayList;
import java.util.List;
public class Test6 {
    public static void main(String[] args) {
        new TestB().test01();
        @SuppressWarnings({})
        List list = new ArrayList();
    }
}
class TestA {
    public void test() {
    }
}
class TestB extends TestA {
    @TestAnn(id = 100, desc = "姓名")
    String name;
    @Override
    public void test() {
        super.test();
    }
    @Deprecated
    public void test01() {
    }
}
@Target(ElementType.FIELD)//這個(gè)注解類是給其他類的屬性做注解
@Retention(RetentionPolicy.RUNTIME)//定義注解的聲明周期
@Documented
@interface TestAnn {
    public int id() default 0;
    public String desc() default "";
}