java第8天代码(集合类)-list

王朝学院·作者佚名  2009-11-10
窄屏简体版  字體: |||超大  

/************Student.java begin***************/

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

public class Student {

private String name;

private String password;

public String getName() {

return name;

}

public String getPassword() {

return password;

}

public void setName(String name) {

this.name = name;

}

public void setPassword(String password) {

this.password = password;

}

public Student(String name, String password) {

super();

this.name = name;

this.password = password;

}

public Student(){}

public List show(String name,String password){

ArrayList list=new ArrayList();

return list;

}

@Override

public String toString() {

// TODO Auto-generated method stub

return "name= "+name+" password= "+password;

}

public static void main(String args[]){

List list=new ArrayList();

//向list中添加对象

list.add(new Student("xsxs","xsxs"));

list.add(new Student("mingkun","ambow"));

list.add(new Student("frfr","frfr"));

list.add(new Student("bgbg","frfr"));

list.add(new Student("cdcd","cdcd"));

// Iterator 这个是迭代器

Iterator it=list.iterator();

while(it.hasNext()){

System.out.println(it.next());

}

}

}

/************Student.java end***************/

/************TestArrayList.java begin***************/

import java.util.ArrayList;

import java.util.Collections;

import java.util.Iterator;

import java.util.List;

public class TestArrayList {

public static void main(String args[]){

List list=new ArrayList();

list.add(new Integer(43));

list.add(54);

list.add(32);

list.add(76);

list.add(31);

list.add(89);

//索引指定查询

// System.out.println(list.get(0));

// for(int i=0;i<7;i++){

// System.out.println(list.get(i));

// }

// for(int i=0;i<list.size();i++){

// System.out.println(list.get(i));

// }

//判断数组中对象是否存在contains(),返回时boolean

// System.out.println(list.contains("hyhy"));

//迭代器Iterator(迭代集合中所有的对象)

Iterator it=list.iterator();

while(it.hasNext()){

System.out.println(it.next());

}

Collections.sort(list);

System.out.println("****************");

Iterator it1=list.iterator();

while(it1.hasNext()){

System.out.println(it1.next());

}

}

}

/************TestArrayList.java end***************/

/************Person.java begin***************/

import java.util.ArrayList;

import java.util.Comparator;

import java.util.Iterator;

import java.util.List;

import java.util.Collections;

public class Person implements Comparable{

private String name;

private int age;

public String getName() {

return name;

}

public int getAge() {

return age;

}

public void setName(String name) {

this.name = name;

}

public void setAge(int age) {

this.age = age;

}

public Person(String name, int age) {

super();

this.name = name;

this.age = age;

}

public Person(){}

public String toString(){

return "name="+name+" age=" +age;

}

public void printList(List list){

Iterator i=list.iterator();

while(i.hasNext()){

System.out.println(i.next());

}

}

public int compareTo(Object obj) {

/**

*这里面堆对象的age进行比较产生序列

*/

if(obj instanceof Person){

Person p=(Person) obj;

// return this.age-p.getAge();

return p.getAge()-this.age;

}

return 0;

}

public static void main(String args[]){

Person p=new Person();

TestPerson tp=new TestPerson();

List list=new ArrayList();

list.add(new Person("大一",25));

list.add(new Person("张三",24));

list.add(new Person("王二",22));

list.add(new Person("李四",27));

p.printList(list);

Collections.sort(list,tp);

System.out.println("*************");

p.printList(list);

}

}

class TestPerson implements Comparator{

public int compare(Object o1, Object o2) {

// TODO Auto-generated method stub

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

Person p=(Person) o1;

Person p1=(Person) o2;

return p.getAge()-p1.getAge();

// return p1.getAge()-p.getAge();

}

return 0;

}

}

/************Person.java end***************/

 
 
 
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