Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

Áù¡¢javaµÄÃæÏò¶ÔÏó³ÌÐòÉè¼Æ(Ïê½âequals·½·¨)

Áù¡¢javaµÄÃæÏò¶ÔÏó³ÌÐòÉè¼Æ(Ïê½âequals·½·¨)
/**
 * Ïê½âequals·½·¨. 
 */
class Equals
{
 private int i;
 public void setI(int i)
 {
  this.i = i;
 }
 public Equals()
 {
  i = 1;
 }
 public Equals(int i)
 {
  this.i = i;
 }
}
class ChangeEquals
{
 private int i;
 public void setI(int i)
 {
  this.i = i;
 }
 public ChangeEquals()
 {
  i = 1;
 }
 public ChangeEquals(int i)
 {
  this.i = i;
 }
 //¸²¸Ç¸¸ÀàµÄequals·½·¨,±È½ÏÁ½¸ö¶ÔÏóµÄ³ÉÔ±±äÁ¿iµÄÖµ
 //Èç¹ûÏàµÈ·µ»Øtrue,²»µÈ·µ»Øfalse.
 public boolean equals(Object obj)
 {
  ChangeEquals ce = null;;
  if(obj instanceof ChangeEquals)
  {
   ce = (ChangeEquals)obj;
   if(this.i == ce.i)
    return true;
   else
    return false;
  }
  return false;
 }
}
public class EqualsTest {
 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  /*µ÷ÓÃÎÒÃÇ´´½¨µÄÀàµÄĬÈÏequals·½·¨*/
  System.out.println("µ÷ÓÃÎÒÃÇ´´½¨µÄÀàµÄĬÈÏequals·½·¨");
  Equals e1 = new Equals();//²ÉÓÃĬÈϹ¹Ôì»ú
  Equals e2 = new Equals();
  System.out.println(e2.equals(e1));//false;
  Equals e3 = new Equals(20);//²ÉÓôø²ÎÊýµÄ¹¹Ôì»ú
  Equals e4 = new Equals(20);
  System.out.println(e3.equals(e4));//false
  //ͨ¹ýÒÔÉÏʵÀýÖ¤Ã÷,EqualsÀàµÄ³ÉÔ±±äÁ¿i²¢²»ÊÇequals·½·¨ÅжϵÄÒÀ¾Ý.Ô­ÒòÈçÏÂ:
  /*
  ÎÒÃÇÏÈÀ´¿´¿´java.lang.ObjectÕâ¸öÀàÖеÄequals·½·¨.
  public boolean equals(Object obj)
  {
    return (this == obj);
  }//~~~³ö×ÔjavaµÄlang°ü
  Ob


Ïà¹ØÎĵµ£º

ÔÚJAVA Ô´³ÌÐòÖбàдSQLÓï¾äʱʹÓÃORACLE °ó¶¨±äÁ¿

ÔÚJAVAÖеÄSQL Óï¾äµÄ±àд·½Ã棬ûÓÐʹÓÃORACLE °ó¶¨±äÁ¿£¬ºÜ´ó³Ì¶ÈÉϽµµÍÁËÊý¾Ý¿âµÄÐÔÄÜ£¬±íÏÖÔÚÁ½¸ö·½Ã棺
 
1¡¢SQLÓï¾äÓ²·ÖÎö(Hard Parse)Ì«¶à£¬ÑÏÖØÏûºÄCPU×ÊÔ´£¬ÑÓ³¤ÁËSQLÓï¾ä×ܵÄÖ´ÐÐʱ¼ä
SQLÓï¾äµÄÖ´Ðйý³Ì·Ö¼¸¸ö²½Ö裺Óï·¨¼ì²é¡¢·ÖÎö¡¢Ö´ÐС¢·µ»Ø½á¹û¡£ÆäÖзÖÎöÓÖ·ÖΪӲ·ÖÎö(Hard Parse)ºÍÈí·ÖÎö(Soft Pars ......

Java×Ö·û´®Óë×Ö·û¼¯µÄ»ù±¾¸ÅÄî


±¾×÷Æ·²ÉÓÃ֪ʶ¹²ÏíÊðÃû-·ÇÉÌÒµÐÔʹÓÃ-Ïàͬ·½Ê½¹²Ïí 2.5 Öйú´ó½Ðí¿ÉЭÒé½øÐÐÐí¿É¡£
Java StringÊÇJava APIÖÐ×î³£ÓõÄÀ࣬±¾Îĺʹó¼Ò̸̸StringÀàµÄÄÚ²¿Ô­Àí£¬Í¬Ê±ÃèÊöISO-8859-1×Ö·û¼¯ÔÚ×Ö·û´®´¦ÀíÖеĶÀÌØÓô¦¡£ 
Java×Ö·û´®µÄÄÚ²¿±àÂë
StringÀàÄÚ²¿¹ÜÀí×ÅÒ»¸öcharÀàÐ͵ÄÊý×飬Java APIÊÇÕâÑùÃèÊöchar»ù±¾ÀàÐ ......

JavaÊä³öJVMºÍ²Ù×÷ϵͳµÄÏà¹ØÊôÐÔ zz

Ö÷ÒªÊÇÀûÓÃJavaÌṩµÄutil°üÖеÄPropertiesÀà¡£·Ï»°²»¶à˵£¬Ö±½Ó¿´´úÂ룺
view plaincopy to clipboardprint?
import java.util.*;
public class YourJavaProperties {
public static void main(String args[]){
Properties props=System.getProperties();
System.out.println("JavaµÄÔËÐл·¾³°æ±¾£º"+props.getP ......

JavaµÄIOʵÀý

//JavaµÄIOµÄÒ»¸öʵÀý
import java.io.*;
import java.util.zip.*;
public class abc5{
 String temp=new String();
 String t=new String();
 public void readByLinefromConsoleAndPrint(){
  System.out.println("==´Ó¿ØÖÆÌ¨»ñµÃÊäÈë==");
  try{
   BufferedReader in=new ......

Îå¡¢javaµÄÃæÏò¶ÔÏó³ÌÐòÉè¼Æ(ÀàºÍ¶ÔÏó)

Îå¡¢javaµÄÃæÏò¶ÔÏó³ÌÐòÉè¼Æ(ÀàºÍ¶ÔÏó)
/**
 * ÃæÏò¶ÔÏóÖ®Ò»
 * ÀàÓë¶ÔÏó
 */
/**
 * ¶ÔÏóµÄʵÀý»¯¹ý³Ì:
 * 1,javaÖÐËùÓÐÀàÐÍÔÚÄÚ´æµÄ·ÖÅäÇé¿ö
 * a,»ù±¾ÀàÐÍ"±äÁ¿"char,byte,short,int,long,float,double,boolean´æ´¢ÔÚ¶ÑÕ»ÖÐ
 *   ¶ÑÕ»ÊÇͨ¹ý¶ÑÕ»Ö¸Õë°´ÕÕÏȽøÏȳöµÄ¶ÁÈ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ