JavaÖеÄÖµ´«µÝºÍµØÖ·´«µÝ
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class TestClass {
/**
* @param args
*/
public static void main(String[] args) {
// TODO ×Ô動Éú³É¤µ¤ì¤¿¥á¥½¥Ã¥É?¥¹¥¿¥Ö
List li = searchCrdNo();
System.out.print("main method now is :"+((Map) li.get(0)).get("AA"));
}
public static List searchCrdNo() {
List li = new ArrayList();
Map ma = new HashMap();
ma.put("AA", "1");
li.add(ma);
Map crdNoMap = (Map) li.get(0);
crdNoMap.put("AA", "22");
System.out.print("now is :"+((Map) li.get(0)).get("AA"));
return li;
}
}
now is :22main method now is :22
×î¼òµ¥µÄÀý×Ó£¬°´Öµ´«µÝµÄÀý×Ó£¡
Ïà¹ØÎĵµ£º
Javaѧϰ´ÓÈëÃŵ½¾«Í¨
Ò»¡¢ JDK (Java Development Kit)
JDKÊÇÕû¸öJavaµÄºËÐÄ£¬°üÀ¨ÁËJavaÔËÐл·¾³£¨Java Runtime Envirnment£©£¬Ò»¶ÑJava¹¤¾ßºÍJava»ù´¡µÄÀà¿â(rt.jar)¡£²»ÂÛʲôJavaÓ¦Ó÷þÎñÆ÷ʵÖʶ¼ÊÇÄÚÖÃÁËij¸ö°æ±¾µÄJDK¡£Òò´ËÕÆÎÕJDKÊÇѧºÃJavaµÄµÚÒ»²½¡£×îÖ÷Á÷µÄJ ......
ÀàµÄ³õʼ»¯ºÍ¶ÔÏó³õʼ»¯ÊÇ JVM ¹ÜÀíµÄÀàÐÍÉúÃüÖÜÆÚÖзdz£ÖØÒªµÄÁ½¸ö»·½Ú£¬Google ÁËÒ»±éÍøÂ磬ÓйØÀà×°ÔØ»úÖÆµÄÎÄÕµ¹ÊDz»ÉÙ£¬È»¶øÀà³õʼ»¯ºÍ¶ÔÏó³õʼ»¯µÄÎÄÕ²¢²»¶à£¬ÌرðÊÇ´Ó×Ö½ÚÂëºÍ JVM ²ã´ÎÀ´·ÖÎöµÄÎÄÕ¸üÊÇÏÊÓÐËù¼û¡£
±¾ÎÄÖ÷Òª¶ÔÀàºÍ¶ÔÏó³õʼ»¯È«¹ý³Ì½øÐзÖÎö£¬Í¨¹ýÒ»¸öʵ¼ÊÎÊÌâÒýÈ룬½«Ô´´úÂëת»»³É JVM ×Ö½ÚÂëºó£¬ ......
1.JavaÔÚÐéÄâ»úÉÏÔËÐÐ
JavaÔ´´úÂë²¢²»ÊDZ»±àÒë³ÉΪÆÕͨµÄ»úÆ÷´úÂë¡£¶øÊDZ»·Òë³ÉΪÐéÄâ»ú¿ÉÒÔÖ´ÐеĴúÂë¡£Ò»¸öJava½âÊÍÆ÷×îÖÕÖ´ÐÐÕâЩ´úÂë¡£ÕâÆäÖÐûÓÐÁ¬½ÓµÄ¹ý³Ì£»½âÊÍÔÚÐèÒªµÄʱºò¶¯Ì¬µÄ¼ÓÔØÒ»Ð©Àࣻ
2.JavaÊÇÍêÈ«ÃæÏò¶ÔÏóµÄ
JavaÊÇÒ»ÖÖÍêÈ«ÃæÏò¶ÔÏóµÄÓïÑÔ¡£ÕâÒâζ×ÅÄã¶ÔÈκÎÒ»¸öJava¶ÔÏóËù×öµÄ¶ ......
JavaÐéÄâ»úÖУ¬Êý¾ÝÀàÐÍ¿ÉÒÔ·ÖΪÁ½Àࣺ»ù±¾ÀàÐͺÍÒýÓÃÀàÐÍ¡£»ù±¾ÀàÐ͵ıäÁ¿±£´æÔʼֵ£¬¼´£ºËû´ú±íµÄÖµ¾ÍÊÇÊýÖµ±¾Éí£»¶øÒýÓÃÀàÐ͵ıäÁ¿±£´æÒýÓÃÖµ¡£“ÒýÓÃÖµ”´ú±íÁËij¸ö¶ÔÏóµÄÒýÓ㬶ø²»ÊǶÔÏó±¾Éí£¬¶ÔÏó±¾Éí´æ·ÅÔÚÕâ¸öÒýÓÃÖµËù±íʾµÄµØÖ·µÄλÖá£
»ù±¾ÀàÐͰüÀ¨£ºbyte, short, int, long, char, float, double ......
public String makeStars(int size, char ch) {
if(size < 1) {
throw new IllegalArgumentException("size must be greater than 0");
}
char[] chs = new char[size];
for(int i = 0; ......