arraylisttest.java

本压缩文件中含有线程的控制

package connections;

import java.util.*;
class ArrayListTest{
	public static void printElements(Collection<Student> c){
		Iterator<Student> it=c.iterator();
		while(it.hasNext()){
			System.out.println(it.next());
		}
	}
	public static void main(String[] args){
		ArrayList all=new ArrayList();
		all.add("winsun");
		all.add("weixin");
		all.add("mybole");
		all.add(new Object());
		System.out.println(all);
		/*al.add(new Point(3,3));
		al.add(new Point(2,2));
		al.add(new Point(4,4));*/
		
		/*for(int i=0;i<al.size();i++){
			System.out.println(al.get(i));
		}*/
		/*System.out.println(al);
		Object[] objs=al.toArray();
		for(int i=0;i<objs.length;i++){
			System.out.println(objs[i]);
		}
		List l=Arrays.asList(objs);
		System.out.println(l);
		printElements(al);*/
		//l.add("zhangsan");
		//Iterator it=al.iterator();
		/*Iterator it=l.iterator();
		it.next();
		it.remove();
		while(it.hasNext()){
			System.out.println(it.next());
		}*/
		Student s1=new Student(2,"zhangsan");
		Student s2=new Student(1,"lisi");
		Student s3=new Student(3,"wangwu");
		Student s4=new Student(2,"mybole");
		ArrayList<Student> al=new ArrayList<Student>();
		al.add(s1);
		al.add(s2);
		al.add(s3);
		Iterator<Student> i = al.iterator();
		while(i.hasNext()){
			i.next();
			i.remove();
			
			
		}
		printElements(al);
		Collections.sort(al);//new Student.StudentComparator());
		
		System.out.println("max : " + Collections.max(al));
		
		printElements(al);
	}
}

class Point{
	int x,y;
	Point(int x,int y){
		this.x=x;
		this.y=y;
	}
	public String toString(){
		return "x="+x+","+"y="+y;
	}
}

class Student implements Comparable<Student>{
	int num;
	String name;

	Student(int num,String name){
		this.num=num;
		this.name=name;
	}
	
	public int compareTo(Student s){
		int result;
		if (num > s.num){
			result = 1;
		}else if (num < s.num){
			result = -1;
		}else{
			result = name.compareTo(s.name);
		}
		return result;
	}
	public String toString(){
		return num+":"+name;
	}
}