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static String s;

void method1() { }

static void method2() { } } (¸ÃÌâΪ±Ø´ðÌâ) A.method1();

A.method2()

System.out.println(a.i)£» a.method1(); ×¢ÊÍ£º

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List myList=new ArrayList£¨£©£» ArrayList myList=new List();

ArrayList myList=new Object£¨£©; List myList=new List£¨£©; ×¢ÊÍ£º

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List list=new List(); // ÊÇ´íÎóµÄÓ÷¨

List list = new ArrayList();Õâ¾ä´´½¨ÁËÒ»¸öArrayListµÄ¶ÔÏóºó°ÑÉÏËݵ½ÁËList¡£´ËʱËüÊÇÒ»¸öList¶ÔÏóÁË£¬ÓÐЩArrayListÓе«ÊÇListûÓеÄÊôÐԺͷ½·¨£¬Ëü¾Í²»ÄÜÔÙÓÃÁË¡£¶øArrayList list=new ArrayList();´´½¨Ò»¶ÔÏóÔò±£ÁôÁËArrayListµÄËùÓÐÊôÐÔ¡£ÕâÊÇÒ»¸öÀý×Ó£º import java.util.*;

public class TestList{

public static void main(String[] args){ List list = new ArrayList();

ArrayList arrayList = new ArrayList(); list.trimToSize(); //´íÎó£¬Ã»Óи÷½·¨¡£

arrayList.trimToSize(); //ArrayListÀïÓи÷½·¨¡£ } }

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ΪʲôҪÓà List list = new ArrayList() ,¶ø²»Óà ArrayList alist = new ArrayList()ÄØ£¿ÎÊÌâ¾ÍÔÚ

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ÐÐÒµÓà ArrayListarr = new ArrayList();¶¨Òå;

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