Treeset集合

TreeSet 集合的特点：

1.它是Set集合的一种 就是无角标型的，二分叉的数据结构

2.它是按照CompareTo()来有序地存放数据的

3.它可以依赖2中比较方式，一种是比较器，一种Comperable;

4.比较器可以随便定义主要比较方法，而Comperable是要格局特定的需求更改的

-------------------------------------------------------------------------------------------

package com.java.TreeSetDmeo.www;

import java.util.Comparator;
import java.util.Iterator;
import java.util.TreeSet;

import com.java.b.www.ComstorByName;
import com.java.b.www.Soilder;

public class TreeSetDmeo {

public static void main(String[] args) {
  TreeSet set=new TreeSet(new ComstorByName());
  set.add(new Soilder("lisi1",27));
  set.add(new Soilder("lisi8",21));
  set.add(new Soilder("lisi9",23));
  set.add(new Soilder("lisi9",25));
  set.add(new Soilder("lisi15",15));
  for (Iterator it = set.iterator(); it.hasNext();) {
   System.out.println(it.next());
   
  }
 }
}

package com.java.b.www;

import java.util.Comparator;

public class Soilder {
 private String name;
 private int age;

public Soilder(String name, int age) {
  super();
  this.name = name;
  this.age = age;
 }

public Soilder() {
  super();
 }

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;
 }

@Override
 public String toString() {
  return "Soilder [name=" + name + ", age=" + age + "]";
 }
 /*@Override
 public int compareTo(Object obj){
  Soilder s=(Soilder)obj;
  return this.age-s.age;
 }*/
}

package com.java.b.www;

import java.util.Comparator;
import com.java.b.www.Soilder;;
public class ComstorByName implements Comparator{
 public int compare(Object o, Object o1) {
  Soilder stu1=(Soilder)o;
  Soilder stu2=(Soilder)o1;
  int temp=stu1.getName().compareTo(stu2.getName());
  if(temp>0){
   return temp;
  }
  if(temp<0){
   return temp;
  }
  return stu1.getAge()-stu2.getAge();
 }
}