实现Set接口的HashSet类
基于HashCode实现元素不重复，当存入元素的哈希吗相同时，会调用equals进行确认，如结果为true，则拒绝后者存入。
HashMap里面的Key允许为NULL，元素不可重复，无序，线程不安全。
import java.util.*;
public class Demo01 {
public static void main(String[] args) {
// 实现set接口的类
Set <Game>set =new HashSet<Game>();
Game hero1 =new Game("Timo",60,700);
Game hero2 =new Game("盖伦",65,800);
Game hero3 =new Game("诺克",62,750);
set.add(hero1);
set.add(hero2);
set.add(hero3);
set.add(null);//可以为null
System.out.println(set.size());
for(Game a1 : set) {//for
System.out.println(a1);
}
System.out.println("___________________________________________");
Iterator inerator = set.iterator();//使用迭代器遍历
hero1.setPowr(99999);
hero1.setLife(99999);
for(Iterator it = set.iterator();it.hasNext();System.out.println(it.next())) {
}
}
}
class Game{
private String name;
private int powr;
private int life;
public Game() {
}
public Game(String name,int powr,int life) {
this.name=name;
this.powr=powr;
this.life=life;
}
@Override
public String toString() {
return "Game [name=" + this.name + ", powr=" + this.powr + ", life=" + this.life + "]";
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPowr() {
return powr;
}
public void setPowr(int powr) {
this.powr = powr;
}
public int getLife() {
return life;
}
public void setLife(int life) {
this.life = life;
}
}
实现Set接口的TreeSet类
HashMap里面的Key不允许为NULL，元素不可重复，无序，线程不安全。
import java.util.Set;
import java.util.TreeSet;
import com.qianfeng.ls.am.first.Person;
import java.util.Iterator;
import java.util.HashSet;
public class Demo02 {
public static void main(String[] args) {
// set接口的实现者TreeSet
Set <Hero> set1 =new TreeSet <Hero>();//Hero类型的泛型Set集合
Iterator it =set1.iterator();//创建迭代器对象
Hero h1 =new Hero("Timo",666);
Hero h2 =new Hero("Gailun",999);
Hero h3 =new Hero("OK",100);
set1.add(h1);
set1.add(h2);
set1.add(h3);
System.out.println(set1.size());
for(Iterator its =set1.iterator();its.hasNext();System.out.println(its.next())) {
}
}
}
@SuppressWarnings("rawtypes")
class Hero implements Comparable{
private String name;
private int age;
public int compareTo(Object page){
Hero ho1 =(Hero)page;
return this.name.compareTo(ho1.name) ;
}
public Hero(){
}
public Hero(String name,int age) {
this.age=age;
this.name=name;
}
@Override
public String toString() {
return "Hero [name=" + name + ", age=" + age + "]";
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
