java第8天代码（集合类）-list

核心提示：/Student.java begin***/ import java.util.ArrayList;import java.util.Iterator;import java.util.List;public class Student { PRivate String name; private String pa

/************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***************/