浅谈TreeSet中的两种排序方式

浅谈TreeSet中的两种排序方式

直接上代码：

package exercise1;

public class Persohttp://n implements Comparable{

private int id;

private String name;

public Person(int id, String name) {

super();

this.id = id;

this.name = name;

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String toString() {

return "Person [id=" + id + ", name=" + name + "]";

}

public int hashCode() {

final int prime = 31;

int result = 1;

result = prhttp://ime * result + id;

result = primSdzqzJe * result + ((name == null) ? 0 : name.hashCode());

return result;

}

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null)

return false;

if (getCSdzqzJlass() != obj.getClass())

return false;

Person other = (Person) obj;

if (id != other.id)

return false;

if (name == null) {

if (other.name != null)

return false;

} else if (!name.equals(other.name))

return false;

return true;

}

public int compareTo(Object o) {

if(o instanceof Person){

Person p=(Person)o;

return this.name.compareTo(p.name);

}

return 0;

}

}

package exercise1;

//TreeSet下的自然排序和定制排序

import java.util.Comparator;

import java.util.Iterator;

import java.util.Set;

import java.util.TreeSet;

import java.util.function.Function;

import java.util.function.ToDoubleFunction;

import java.util.function.ToIntFunction;

import java.util.function.ToLongFunction;

import org.junit.Test;

//定制排序

public class DisOrder {

@Test

public void unNature(){

Comparator com=new Comparator() {

public int compare(Object o1, Object o2) {

if(o1 instanceof Person && o2 instanceof Person){

Person p1=(Person)o1;

Person p2=(Person)o2;

return p1.getName().compareTo(p2.getName());

}

return 0;

}

};

Set set=new TreeSet(com);

set.add(new Person(111,"MM"));

set.add(new Person(222,"DD"));

set.add(new Person(333,"GG"));

for(Object obj:set){

System.out.println(obj);

}

}

//自然排序

@Test

public void nature() {

Set set=new TreeSet();

set.add("aa");

set.add("bb");

set.add("ff");

set.add("zz");

for(Object obj:set){

System.out.println(obj);

}

}

}

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