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  2605  次浏览      27
 2019-4-28
 
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Àý1£º¹ØÓÚString ,StringBuffer£¬+ºÍappend

JAVAÓïÑÔÌṩÁ˶ÔÓÚStringÀàÐͱäÁ¿µÄ²Ù×÷¡£µ«Èç¹ûʹÓò»µ±£¬»á¸ø³ÌÐòµÄÐÔÄÜ´øÀ´Ó°Ïì¡£ÈçÏÂÃæµÄÓï¾ä£º

String name=new String("HuangWeiFeng");
System.out.println(name+"is my name");

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(1) Éú³ÉеÄ×Ö·û´® new String£¨STR_1);

(2) ¸´ÖƸÃ×Ö·û´®;

(3) ¼ÓÔØ×Ö·û´®³£Á¿"HuangWeiFeng"£¨STR_2);

(4) µ÷ÓÃ×Ö·û´®µÄ¹¹¼ÜÆ÷£¨Constructor£©;

(5) ±£´æ¸Ã×Ö·û´®µ½Êý×éÖУ¨´ÓλÖÃ0¿ªÊ¼£©;

(6) ´Ójava.io.PrintStreamÀàÖеõ½¾²Ì¬µÄout±äÁ¿;

(7) Éú³ÉеÄ×Ö·û´®»º³å±äÁ¿new StringBuffer(STR_BUF_1);

(8) ¸´ÖƸÃ×Ö·û´®»º³å±äÁ¿;

(9) µ÷ÓÃ×Ö·û´®»º³åµÄ¹¹¼ÜÆ÷£¨Constructor£©;

(10) ±£´æ¸Ã×Ö·û´®»º³åµ½Êý×éÖУ¨´ÓλÖÃ1¿ªÊ¼£©;

(11) ÒÔSTR_1Ϊ²ÎÊý£¬µ÷ÓÃ×Ö·û´®»º³å(StringBuffer)ÀàÖеÄappend·½·¨;

(12) ¼ÓÔØ×Ö·û´®³£Á¿"is my name"(STR_3);

(13) ÒÔSTR_3Ϊ²ÎÊý£¬µ÷ÓÃ×Ö·û´®»º³å(StringBuffer)ÀàÖеÄappend·½·¨;

(14) ¶ÔÓÚSTR_BUF_1Ö´ÐÐtoStringÃüÁî;

(15) µ÷ÓÃout±äÁ¿ÖеÄprintln·½·¨£¬Êä³ö½á¹û¡£

ÓÉ´Ë¿ÉÒÔ¿´³ö£¬ÕâÁ½Ðмòµ¥µÄ´úÂ룬¾ÍÉú³ÉÁËSTR_1,STR_2,STR_3,STR_4ºÍSTR_BUF_1Îå¸ö¶ÔÏó±äÁ¿¡£ÕâЩÉú³ÉµÄÀàµÄʵÀýÒ»°ã¶¼´æ·ÅÔÚ¶ÑÖС£¶ÑÒª¶ÔËùÓÐÀàµÄ³¬À࣬ÀàµÄʵÀý½øÐгõʼ»¯£¬Í¬Ê±»¹Òªµ÷ÓÃÀ༫Æäÿ¸ö³¬ÀàµÄ¹¹¼ÜÆ÷¡£¶øÕâЩ²Ù×÷¶¼ÊǷdz£ÏûºÄϵͳ×ÊÔ´µÄ¡£Òò´Ë£¬¶Ô¶ÔÏóµÄÉú³É½øÐÐÏÞÖÆ£¬ÊÇÍêÈ«ÓбØÒªµÄ¡£

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StringBuffer name=new StringBuffer("HuangWeiFeng");
System.out.println(name.append("is my name.").toString());

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(1) Éú³ÉеÄ×Ö·û´®»º³å±äÁ¿new StringBuffer(STR_BUF_1);

(2) ¸´ÖƸÃ×Ö·û´®»º³å±äÁ¿;

(3) ¼ÓÔØ×Ö·û´®³£Á¿"HuangWeiFeng"(STR_1);

(4) µ÷ÓÃ×Ö·û´®»º³åµÄ¹¹¼ÜÆ÷£¨Constructor£©;

(5) ±£´æ¸Ã×Ö·û´®»º³åµ½Êý×éÖУ¨´ÓλÖÃ1¿ªÊ¼£©;

(6) ´Ójava.io.PrintStreamÀàÖеõ½¾²Ì¬µÄout±äÁ¿;

(7) ¼ÓÔØSTR_BUF_1;

(8) ¼ÓÔØ×Ö·û´®³£Á¿"is my name"(STR_2);

(9) ÒÔSTR_2Ϊ²ÎÊý£¬µ÷ÓÃ×Ö·û´®»º³å(StringBuffer)ʵÀýÖеÄappend·½·¨;

(10) ¶ÔÓÚSTR_BUF_1Ö´ÐÐtoStringÃüÁî(STR_3);

(11)µ÷ÓÃout±äÁ¿ÖеÄprintln·½·¨£¬Êä³ö½á¹û¡£

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String name= new StringBuffer("HuangWeiFeng");
name+="is my";
name+="name";

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StringBuffer name=new StringBuffer("HuangWeiFeng");
name.append("is my");
name.append("name.").toString();

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(1) ¾¡¿ÉÄܵÄʹÓþ²Ì¬±äÁ¿£¨Static Class Variables£©

Èç¹ûÀàÖеıäÁ¿²»»áËæËûµÄʵÀý¶ø±ä»¯£¬¾Í¿ÉÒÔ¶¨ÒåΪ¾²Ì¬±äÁ¿£¬´Ó¶øÊ¹ËûËùÓеÄʵÀý¶¼¹²ÏíÕâ¸ö±äÁ¿¡£

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public class foo
{
SomeObject so=new SomeObject();
}

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public class foo
{
static SomeObject so=new SomeObject();
}

(2) ²»Òª¶ÔÒÑÉú³ÉµÄ¶ÔÏó×÷¹ý¶àµÄ¸Ä±ä¡£

¶ÔÓÚһЩÀà(È磺StringÀà)À´½²£¬ÄþÔ¸ÔÚÖØÐÂÉú³ÉÒ»¸öеĶÔÏóʵÀý£¬¶ø²»Ó¦¸ÃÐÞ¸ÄÒѾ­Éú³ÉµÄ¶ÔÏóʵÀý¡£

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String name="Huang";
name="Wei";
name="Feng";

ÉÏÊö´úÂëÉú³ÉÁËÈý¸öStringÀàÐ͵ĶÔÏóʵÀý¡£¶øÇ°Á½¸öÂíÉϾÍÐèҪϵͳ½øÐÐÀ¬»ø»ØÊÕ´¦Àí¡£Èç¹ûÒª¶Ô×Ö·û´®½øÐÐÁ¬½ÓµÄ²Ù×÷£¬ÐÔÄܽ«µÃ¸ü²î£¬ÒòΪϵͳ½«²»µÃΪ´ËÉú³É¸ü¶àµÃÁÙʱ±äÁ¿£¬ÈçÉÏÀý1Ëùʾ¡£

(3) Éú³É¶ÔÏóʱ£¬Òª·ÖÅ䏸ËüºÏÀíµÄ¿Õ¼äºÍ´óСJAVAÖеĺܶàÀà¶¼ÓÐËüµÄĬÈϵĿռä·ÖÅä´óС¡£¶ÔÓÚStringBufferÀàÀ´½²£¬Ä¬ÈϵķÖÅä¿Õ¼ä´óСÊÇ16¸ö×Ö·û¡£Èç¹ûÔÚ³ÌÐòÖÐʹÓÃStringBufferµÄ¿Õ¼ä´óС²»ÊÇ16¸ö×Ö·û£¬ÄÇô¾Í±ØÐë½øÐÐÕýÈ·µÄ³õʼ»¯¡£

(4) ±ÜÃâÉú³É²»Ì«Ê¹ÓûòÉúÃüÖÜÆÚ¶ÌµÄ¶ÔÏó»ò±äÁ¿¡£¶ÔÓÚÕâÖÖÇé¿ö£¬Òò¸Ã¶¨ÒåÒ»¸ö¶ÔÏó»º³å³Ø¡£ÒÔΪ¹ÜÀíÒ»¸ö¶ÔÏó»º³å³ØµÄ¿ªÏúÒª±ÈƵ·±µÄÉú³ÉºÍ»ØÊÕ¶ÔÏóµÄ¿ªÏúСµÄ¶à¡£

(5) Ö»ÔÚ¶ÔÏó×÷Ó÷¶Î§ÄÚ½øÐгõʼ»¯¡£JAVAÔÊÐíÔÚ´úÂëµÄÈκεط½¶¨ÒåºÍ³õʼ»¯¶ÔÏó¡£ÕâÑù£¬¾Í¿ÉÒÔÖ»ÔÚ¶ÔÏó×÷Óõķ¶Î§ÄÚ½øÐгõʼ»¯¡£´Ó¶ø½ÚԼϵͳµÄ¿ªÏú¡£

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SomeObject so=new SomeObject();
If(x==1) then
{
Foo=so.getXX();
}

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if(x==1) then
{
SomeObject so=new SomeObject();
Foo=so.getXX();
}

¶þ¡¢Òì³£(Exceptions)

JAVAÓïÑÔÖÐÌṩÁËtry/catchÀ´·¢·½±ãÓû§²¶×½Òì³££¬½øÐÐÒì³£µÄ´¦Àí¡£µ«ÊÇÈç¹ûʹÓò»µ±£¬Ò²»á¸øJAVA³ÌÐòµÄÐÔÄÜ´øÀ´Ó°Ïì¡£Òò´Ë£¬Òª×¢ÒâÒÔÏÂÁ½µã£º

(1) ±ÜÃâ¶ÔÓ¦ÓóÌÐòµÄÂß¼­Ê¹ÓÃtry/catch

Èç¹û¿ÉÒÔÓÃif,whileµÈÂß¼­Óï¾äÀ´´¦Àí£¬ÄÇô¾Í¾¡¿ÉÄܵIJ»ÓÃtry/catchÓï¾ä¡£

(2) ÖØÓÃÒì³£

ÔÚ±ØÐëÒª½øÐÐÒì³£µÄ´¦Àíʱ£¬Òª¾¡¿ÉÄܵÄÖØÓÃÒѾ­´æÔÚµÄÒì³£¶ÔÏó¡£ÒÔΪÔÚÒì³£µÄ´¦ÀíÖУ¬Éú³ÉÒ»¸öÒì³£¶ÔÏóÒªÏûºÄµô´ó²¿·ÖµÄʱ¼ä¡£

Èý¡¢Ïß³Ì(Threading)

Ò»¸ö¸ßÐÔÄܵÄÓ¦ÓóÌÐòÖÐÒ»°ã¶¼»áÓõ½Ï̡߳£ÒòΪÏß³ÌÄܳä·ÖÀûÓÃϵͳµÄ×ÊÔ´¡£ÔÚÆäËûÏß³ÌÒòΪµÈ´ýÓ²ÅÌ»òÍøÂç¶Áд¶ø ʱ£¬³ÌÐòÄܼÌÐø´¦ÀíºÍÔËÐС£µ«ÊǶÔÏß³ÌÔËÓò»µ±£¬Ò²»áÓ°Ïì³ÌÐòµÄÐÔÄÜ¡£

Àý2£ºÕýȷʹÓÃVectorÀà

VectorÖ÷ÒªÓÃÀ´±£´æ¸÷ÖÖÀàÐ͵ĶÔÏ󣨰üÀ¨ÏàͬÀàÐͺͲ»Í¬ÀàÐ͵ĶÔÏ󣩡£µ«ÊÇÔÚһЩÇé¿öÏÂʹÓÃ»á¸ø³ÌÐò´øÀ´ÐÔÄÜÉϵÄÓ°Ïì¡£ÕâÖ÷ÒªÊÇÓÉVectorÀàµÄÁ½¸öÌØµãËù¾ö¶¨µÄ¡£µÚÒ»£¬VectorÌṩÁËÏ̵߳ݲȫ±£»¤¹¦ÄÜ¡£¼´Ê¹VectorÀàÖеÄÐí¶à·½·¨Í¬²½¡£µ«ÊÇÈç¹ûÄãÒѾ­È·ÈÏÄãµÄÓ¦ÓóÌÐòÊǵ¥Ị̈߳¬ÕâЩ·½·¨µÄͬ²½¾ÍÍêÈ«²»±ØÒªÁË¡£µÚ¶þ£¬ÔÚVector²éÕÒ´æ´¢µÄ¸÷ÖÖ¶ÔÏóʱ£¬³£³£Òª»¨ºÜ¶àµÄʱ¼ä½øÐÐÀàÐÍµÄÆ¥Åä¡£¶øµ±ÕâЩ¶ÔÏó¶¼ÊÇͬһÀàÐÍʱ£¬ÕâЩƥÅä¾ÍÍêÈ«²»±ØÒªÁË¡£Òò´Ë£¬ÓбØÒªÉè¼ÆÒ»¸öµ¥Ï̵߳쬱£´æÌض¨ÀàÐͶÔÏóµÄÀà»ò¼¯ºÏÀ´Ìæ´úVectorÀà.ÓÃÀ´Ìæ»»µÄ³ÌÐòÈçÏÂ

public class StringVector
{
private String [] data;
private int count;
public StringVector()
{
this(10); // default size is 10
}
public StringVector(int initialSize)
{
data = new String[initialSize];
}
public void add(String str)
{
// ignore null strings
if(str == null) { return; }
ensureCapacity(count + 1);
data[count++] = str;
}
private void ensureCapacity(int minCapacity)
{
int oldCapacity = data.length;
if (minCapacity > oldCapacity)
{
String oldData[] = data;
int newCapacity = oldCapacity * 2;
data = new String[newCapacity];
System.arraycopy(oldData, 0, data, 0, count);
}
}
public void remove(String str)
{
if(str == null) { return; // ignore null str }
for(int i = 0; i < count; i++)
{
// check for a match
if(data[i].equals(str))
{
System.arraycopy(data,i+1,data,i,count-1); // copy data
// allow previously valid array element be gc¡äd
data[--count] = null;
return;
}
}
}
public final String getStringAt(int index)
{
if(index < 0) { return null; }
else if(index > count) { return null; // index is > # strings }
else { return data[index]; // index is good }
}
}

Òò´Ë£¬´úÂ룺

Vector Strings=new Vector();
Strings.add("One");
Strings.add("Two");
String Second=(String)Strings.elementAt(1);

¿ÉÒÔÓÃÈçϵĴúÂëÌæ»»£º

StringVector Strings=new StringVector();
Strings.add("One");
Strings.add("Two");
String Second=Strings.getStringAt(1);

ÕâÑù¾Í¿ÉÒÔͨ¹ýÓÅ»¯Ïß³ÌÀ´Ìá¸ßJAVA³ÌÐòµÄÐÔÄÜ¡£ÓÃÓÚ²âÊԵijÌÐòÈçÏÂ

import java.util.Vector;
public class TestCollection
{
public static void main(String args [])
{
TestCollection collect = new TestCollection();
if(args.length == 0)
{
System.out.println("Usage: java TestCollection [ vector | stringvector ]");
System.exit(1);
}
if(args[0].equals("vector"))
{
Vector store = new Vector();
long start = System.currentTimeMillis();
for(int i = 0; i < 1000000; i++)
{
store.addElement("string");
}
long finish = System.currentTimeMillis();
System.out.println((finish-start));
start = System.currentTimeMillis();
for(int i = 0; i < 1000000; i++)
{
String result = (String)store.elementAt(i);
}
finish = System.currentTimeMillis();
System.out.println((finish-start));
}
else if(args[0].equals("stringvector"))
{
StringVector store = new StringVector();
long start = System.currentTimeMillis();
for(int i = 0; i < 1000000; i++) { store.add("string"); }
long finish = System.currentTimeMillis();
System.out.println((finish-start));
start = System.currentTimeMillis();
for(int i = 0; i < 1000000; i++) {
String result = store.getStringAt(i);
}
finish = System.currentTimeMillis();
System.out.println((finish-start));
}
}
}

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Ò»°ãÿ¸ö¶ÔÏó¶¼Ö»ÓÐÒ»¸ö¡±Ëø¡±£¬Õâ¾Í±íÃ÷Èç¹ûÁ½¸öÏß³ÌÖ´ÐÐÒ»¸ö¶ÔÏóµÄÁ½¸ö²»Í¬µÄͬ²½·½·¨Ê±£¬»á·¢Éú¡±ËÀËø¡±¡£¼´Ê¹ÕâÁ½¸ö·½·¨²¢²»¹²ÏíÈκÎ×ÊÔ´¡£ÎªÁ˱ÜÃâÕâ¸öÎÊÌ⣬¿ÉÒÔ¶ÔÒ»¸ö¶ÔÏóʵÐС±¶àËø¡±µÄ»úÖÆ¡£ÈçÏÂËùʾ£º

class foo
{
private static int var1;
private static Object lock1=new Object();
private static int var2;
private static Object lock2=new Object();
public static void increment1()
{
synchronized(lock1)
{
var1++;
}
}
public static void increment2()
{
synchronized(lock2)
{
var2++;
}
}
}

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