在CSDN上看以个帖子，String s=new String("sss");到底生成了几个对象？类似的帖子看过多次，答案也多种多样。实在是糊涂了，不得已利用JPROFILES对String 做了一系列的测试，结果如下：
| 代码 |
实例个数： |
大小 bytes |
| String s="jalion"; |
char[]:1 |
24 |
| String:1 |
24 |
| String s=new String(); |
char[]:1 |
16 |
| String:1 |
24 |
| String s; |
char[]:0 |
0 |
| String:0 |
0 |
| new String("jalion"); |
char[]:1 |
24 |
| String:2 |
48 |
| new String(); |
char[]:1 |
16 |
| String:1 |
24 |
| String s=new String("jalion"); |
char[]:1 |
24 |
| String:2 |
48 |
| String s=new String(new char[]{'j','a','l','i','o','n'}); |
char[]:2 |
48 |
| String:1 |
24 |
char c[]=new char[]{'j','a','l','i','o','n'};
String s=new String(c); |
char[]:2 |
48 |
| String:1 |
24 |
| String s="jalion"+"jalion"; |
char[]:1 |
40 |
| String:1 |
24 |
|
new String("");
|
char[]:0 |
0 |
| String:1 |
24 |
|
char c[]=new new char[]{'j','a','l','i','o','n'}
|
char[]:1 |
24 |
| String:0 |
0 |
|
String s=new String(“jalion”)+”jalion”;
|
char[]:7 |
376 |
| String:7 |
168 |
| String s=”jalion”+new String(“jalion”); |
char[]:7 |
376 |
| String:7 |
168 |
| String s=new String(“jalion”)+new String(“jalion”); |
char[]:7 |
376 |
| String:8 |
192 |
|
String s="jalion";
String y=new String("jalion");
|
char[]:1 |
24 |
| String:2 |
48 |
结论：请等待
posted on 2007-07-01 10:06
李桢 阅读(1239)
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