{"id":117,"date":"2015-04-01T11:48:29","date_gmt":"2015-04-01T03:48:29","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=117"},"modified":"2015-04-18T21:31:44","modified_gmt":"2015-04-18T13:31:44","slug":"java%e5%8c%85%e8%a3%85%e7%b1%bb%e3%80%81%e6%8b%86%e7%ae%b1%e5%92%8c%e8%a3%85%e7%ae%b1%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=117","title":{"rendered":"Java\u5305\u88c5\u7c7b\u3001\u62c6\u7bb1\u548c\u88c5\u7bb1\u8be6\u89e3"},"content":{"rendered":"

\u867d\u7136 Java \u8bed\u8a00\u662f\u5178\u578b\u7684\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u8bed\u8a00\uff0c\u4f46\u5176\u4e2d\u7684\u516b\u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5e76\u4e0d\u652f\u6301\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff0c\u57fa\u672c\u7c7b\u578b\u7684\u6570\u636e\u4e0d\u5177\u5907\u201c\u5bf9\u8c61\u201d\u7684\u7279\u6027\u2014\u2014\u4e0d\u643a\u5e26\u5c5e\u6027\u3001\u6ca1\u6709\u65b9\u6cd5\u53ef\u8c03\u7528\u3002 \u6cbf\u7528\u5b83\u4eec\u53ea\u662f\u4e3a\u4e86\u8fce\u5408\u4eba\u7c7b\u6839\u6df1\u8482\u56fa\u7684\u4e60\u60ef\uff0c\u5e76\u7684\u786e\u80fd\u7b80\u5355\u3001\u6709\u6548\u5730\u8fdb\u884c\u5e38\u89c4\u6570\u636e\u5904\u7406\u3002
\n<\/p>\n

\u8fd9\u79cd\u501f\u52a9\u4e8e\u975e\u9762\u5411\u5bf9\u8c61\u6280\u672f\u7684\u505a\u6cd5\u6709\u65f6\u4e5f\u4f1a\u5e26\u6765\u4e0d\u4fbf\uff0c\u6bd4\u5982\u5f15\u7528\u7c7b\u578b\u6570\u636e\u5747\u7ee7\u627f\u4e86 Object \u7c7b\u7684\u7279\u6027\uff0c\u8981\u8f6c\u6362\u4e3a String \u7c7b\u578b\uff08\u7ecf\u5e38\u6709\u8fd9\u79cd\u9700\u8981\uff09\u65f6\u53ea\u8981\u7b80\u5355\u8c03\u7528 Object \u7c7b\u4e2d\u5b9a\u4e49\u7684toString()\u5373\u53ef\uff0c\u800c\u57fa\u672c\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3a String \u7c7b\u578b\u5219\u8981\u9ebb\u70e6\u5f97\u591a\u3002\u4e3a\u89e3\u51b3\u6b64\u7c7b\u95ee\u9898 \uff0cJava\u4e3a\u6bcf\u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5206\u522b\u8bbe\u8ba1\u4e86\u5bf9\u5e94\u7684\u7c7b\uff0c\u79f0\u4e4b\u4e3a\u5305\u88c5\u7c7b(Wrapper Classes)\uff0c\u4e5f\u6709\u6559\u6750\u79f0\u4e3a\u5916\u8986\u7c7b\u6216\u6570\u636e\u7c7b\u578b\u7c7b\u3002<\/p>\n

\u6bcf\u4e2a\u5305\u88c5\u7c7b\u7684\u5bf9\u8c61\u53ef\u4ee5\u5c01\u88c5\u4e00\u4e2a\u76f8\u5e94\u7684\u57fa\u672c\u7c7b\u578b\u7684\u6570\u636e\uff0c\u5e76\u63d0\u4f9b\u4e86\u5176\u5b83\u4e00\u4e9b\u6709\u7528\u7684\u65b9\u6cd5\u3002\u5305\u88c5\u7c7b\u5bf9\u8c61\u4e00\u7ecf\u521b\u5efa\uff0c\u5176\u5185\u5bb9\uff08\u6240\u5c01\u88c5\u7684\u57fa\u672c\u7c7b\u578b\u6570\u636e\u503c\uff09\u4e0d\u53ef\u6539\u53d8\u3002<\/p>\n

\u57fa\u672c\u7c7b\u578b\u548c\u5bf9\u5e94\u7684\u5305\u88c5\u7c7b\u53ef\u4ee5\u76f8\u4e92\u88c5\u6362\uff1a
\n\u7531\u57fa\u672c\u7c7b\u578b\u5411\u5bf9\u5e94\u7684\u5305\u88c5\u7c7b\u8f6c\u6362\u79f0\u4e3a\u88c5\u7bb1\uff0c\u4f8b\u5982\u628a int \u5305\u88c5\u6210 Integer \u7c7b\u7684\u5bf9\u8c61\uff1b
\n\u5305\u88c5\u7c7b\u5411\u5bf9\u5e94\u7684\u57fa\u672c\u7c7b\u578b\u8f6c\u6362\u79f0\u4e3a\u62c6\u7bb1\uff0c\u4f8b\u5982\u628a Integer \u7c7b\u7684\u5bf9\u8c61\u91cd\u65b0\u7b80\u5316\u4e3a int\u3002<\/p>\n

\u5305\u88c5\u7c7b\u7684\u5e94\u7528
\n\u516b\u4e2a\u5305\u88c5\u7c7b\u7684\u4f7f\u7528\u6bd4\u8f83\u76f8\u4f3c\uff0c\u4e0b\u9762\u662f\u5e38\u89c1\u7684\u5e94\u7528\u573a\u666f\u3002
\n1) \u5b9e\u73b0 int \u548c Integer \u7684\u76f8\u4e92\u8f6c\u6362<\/p>\n

\u53ef\u4ee5\u901a\u8fc7 Integer \u7c7b\u7684\u6784\u9020\u65b9\u6cd5\u5c06 int \u88c5\u7bb1\uff0c\u901a\u8fc7 Integer \u7c7b\u7684 intValue \u65b9\u6cd5\u5c06 Integer \u62c6\u7bb1\u3002\u4f8b\u5982\uff1a
\n[java]public class Demo {
\n\u00a0\u00a0\u00a0 public static void main(String[] args) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 int m = 500;
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Integer obj = new Integer(m); \/\/ \u624b\u52a8\u88c5\u7bb1
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 int n = obj.intValue(); \/\/ \u624b\u52a8\u62c6\u7bb1
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("n = " + n);
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Integer obj1 = new Integer(500);
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("obj \u7b49\u4ef7\u4e8e obj1\uff1f" + obj.equals(obj1));
\n\u00a0\u00a0\u00a0 }
\n}[\/java]
\n\u8fd0\u884c\u7ed3\u679c\uff1a
\nn = 500
\nobj \u7b49\u4ef7\u4e8e obj1\uff1ftrue<\/p>\n

2) \u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6574\u6570
\nInteger \u7c7b\u6709\u4e00\u4e2a\u9759\u6001\u7684 paseInt() \u65b9\u6cd5\uff0c\u53ef\u4ee5\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6574\u6570\uff0c\u8bed\u6cd5\u4e3a\uff1a
\nparseInt(String s, int radix);
\ns \u4e3a\u8981\u8f6c\u6362\u7684\u5b57\u7b26\u4e32\uff0cradix \u4e3a\u8fdb\u5236\uff0c\u53ef\u9009\uff0c\u9ed8\u8ba4\u4e3a\u5341\u8fdb\u5236\u3002<\/p>\n

\u4e0b\u9762\u7684\u4ee3\u7801\u5c06\u4f1a\u544a\u8bc9\u4f60\u4ec0\u4e48\u6837\u7684\u5b57\u7b26\u4e32\u53ef\u4ee5\u8f6c\u6362\u4e3a\u6574\u6570\uff1a
\n[java]public class Demo {
\n\u00a0\u00a0\u00a0 public static void main(String[] args) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 String str[] = {"123", "123abc", "abc123", "abcxyz"};
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 for(String str1 : str){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 try{
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 int m = Integer.parseInt(str1, 10);
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(str1 + " \u53ef\u4ee5\u8f6c\u6362\u4e3a\u6574\u6570 " + m);
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }catch(Exception e){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(str1 + " \u65e0\u6cd5\u8f6c\u6362\u4e3a\u6574\u6570");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 }
\n}[\/java]
\n\u8fd0\u884c\u7ed3\u679c\uff1a
\n123 \u53ef\u4ee5\u8f6c\u6362\u4e3a\u6574\u6570 123
\n123abc \u65e0\u6cd5\u8f6c\u6362\u4e3a\u6574\u6570
\nabc123 \u65e0\u6cd5\u8f6c\u6362\u4e3a\u6574\u6570
\nabcxyz \u65e0\u6cd5\u8f6c\u6362\u4e3a\u6574\u6570<\/p>\n

3) \u5c06\u6574\u6570\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32
\nInteger \u7c7b\u6709\u4e00\u4e2a\u9759\u6001\u7684 toString() \u65b9\u6cd5\uff0c\u53ef\u4ee5\u5c06\u6574\u6570\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u3002\u4f8b\u5982\uff1a
\n[java]public class Demo {
\n\u00a0\u00a0\u00a0 public static void main(String[] args) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 int m = 500;
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 String s = Integer.toString(m);
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("s = " + s);
\n\u00a0\u00a0\u00a0 }
\n}[\/java]
\n\u8fd0\u884c\u7ed3\u679c\uff1a
\ns = 500
\n\u81ea\u52a8\u62c6\u7bb1\u548c\u88c5\u7bb1<\/p>\n

\u4e0a\u9762\u7684\u4f8b\u5b50\u90fd\u9700\u8981\u624b\u52a8\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5305\u88c5\u7c7b\uff0c\u79f0\u4e3a\u624b\u52a8\u62c6\u7bb1\u88c5\u7bb1\u3002Java 1.5(5.0) \u4e4b\u524d\u5fc5\u987b\u624b\u52a8\u62c6\u7bb1\u88c5\u7bb1\u3002<\/p>\n

Java 1.5 \u4e4b\u540e\u53ef\u4ee5\u81ea\u52a8\u62c6\u7bb1\u88c5\u7bb1\uff0c\u4e5f\u5c31\u662f\u5728\u8fdb\u884c\u57fa\u672c\u6570\u636e\u7c7b\u578b\u548c\u5bf9\u5e94\u7684\u5305\u88c5\u7c7b\u8f6c\u6362\u65f6\uff0c\u7cfb\u7edf\u5c06\u81ea\u52a8\u8fdb\u884c\uff0c\u8fd9\u5c06\u5927\u5927\u65b9\u4fbf\u7a0b\u5e8f\u5458\u7684\u4ee3\u7801\u4e66\u5199\u3002\u4f8b\u5982\uff1a
\n[java]public class Demo {
\n\u00a0\u00a0\u00a0 public static void main(String[] args) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 int m = 500;
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Integer obj = m; \/\/ \u81ea\u52a8\u88c5\u7bb1
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 int n = obj; \/\/ \u81ea\u52a8\u62c6\u7bb1
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("n = " + n);
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Integer obj1 = 500;
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("obj \u7b49\u4ef7\u4e8e obj1\uff1f" + obj.equals(obj1));
\n\u00a0\u00a0\u00a0 }
\n}[\/java]
\n\u8fd0\u884c\u7ed3\u679c\uff1a
\nn = 500
\nobj \u7b49\u4ef7\u4e8e obj1\uff1ftrue<\/p>\n

\u81ea\u52a8\u62c6\u7bb1\u88c5\u7bb1\u662f\u5e38\u7528\u7684\u4e00\u4e2a\u529f\u80fd\uff0c\u8bfb\u8005\u9700\u8981\u91cd\u70b9\u638c\u63e1\u3002<\/p>\n

\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"

\u867d\u7136 Java \u8bed\u8a00\u662f\u5178\u578b\u7684\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u8bed\u8a00\uff0c\u4f46\u5176\u4e2d\u7684\u516b\u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5e76\u4e0d\u652f\u6301\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff0c\u57fa\u672c\u7c7b\u578b\u7684\u6570\u636e\u4e0d\u5177 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[16],"tags":[30],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/117"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=117"}],"version-history":[{"count":3,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/117\/revisions"}],"predecessor-version":[{"id":383,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/117\/revisions\/383"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=117"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=117"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=117"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}