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/**
* ÃæÏò¶ÔÏóÖ®¶þ
* ¹¹Ôì·½·¨(¹¹Ôì»ú):
*
* 1,¹¹Ôì·½·¨µÄÌØÕ÷:
* Ëü¾ßÓÐÓëÀàÏàͬµÄÃû³Æ£»
* Ëü²»º¬·µ»ØÖµ£»
* Ëü²»ÄÜÔÚ·½·¨ÖÐÓÃreturnÓï¾ä·µ»ØÒ»¸öÖµ
* ×¢Ò⣺ÔÚ¹¹Ôì·½·¨Àï²»º¬·µ»ØÖµµÄ¸ÅÄîÊDz»Í¬ÓÚ“void”µÄ£¬ÔÚ¶¨Òå¹¹Ôì·½·¨Ê±¼ÓÁË“void”£¬½á¹ûÕâ¸ö·½·¨¾Í²»ÔÙ±»×Ô¶¯µ÷ÓÃÁË¡£
* 2,¹¹Ôì·½·¨µÄ×÷Óãº
* µ±Ò»¸öÀàµÄʵÀý¶ÔÏó¸Õ²úÉúʱ£¬Õâ¸öÀàµÄ¹¹Ôì·½·¨¾Í»á±»×Ô¶¯µ÷Óã¬ÎÒÃÇ¿ÉÒÔÔÚÕâ¸ö·½·¨ÖмÓÈëÒªÍê³É³õʼ»¯¹¤×÷µÄ´úÂë¡£
* Ò²¾ÍÊÇ˵,¹¹Ôì»ú×î´óµÄ×÷ÓÃÊÇΪÀà³ÉÔ±³õʼ»¯.
*/
class Constructor
{
private int i;
private String str;
//public Constructor(){}
//µ±ÎÒÃDz»Îª´´½¨µÄÀàÌí¼Ó¹¹Ôì·½·¨Ê±,ϵͳ»á×Ô¼ºÎªÎÒÃÇÌí¼ÓÒ»¸öĬÈϵĹ¹Ôì·½·¨.
//µ«ÊÇ,µ±ÎÒÃÇÒѾΪ¸ÃÀàµÄ¼ÓÉϹ¹Ôì·½·¨ºó,ÄÇôϵͳ½«²»ÔÙΪÎÒÃÇ×Ô¶¯´´½¨¹¹Ôì·½·¨ÁË.
public Constructor()
{
System.out.println("default Constructor is calling");
i = -1;
str = "unknown";
}
public Constructor(int i)
{
System.out.println("one int type args Constructor is calling");
this.i = i;
str = "unknown";
}
public Constructor(int i,String str)
{
System.out.println("two args Constructor is calling");
this.i = i;
this.str = str;
}
public int getI(){return i;}
public String getStr(){return str;}
}
public class ConstructFunction {
public static void main(String[] args) {
Constructor ctor1 = new Constructor();
System.out.println("Constructor.i = " + ctor1.getI() + " " +
"Constructor.str = " + ctor1.getStr());
Constructor ctor2 = new Constructor(20);
System.out.println("Constructor.i = " + ctor2.getI() + " " +
"Constructor.str = " + ctor2.getStr());
Constructor ctor3 = new Constructor(30,"Co
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private static boolean isValidDate(String strValue ) {//20091001×Ö·û´®
int d = Integer.parseInt(strValue.substring(6, 8));
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