{"id":1098,"date":"2022-10-23T22:50:25","date_gmt":"2022-10-23T14:50:25","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1098"},"modified":"2022-11-27T12:39:50","modified_gmt":"2022-11-27T04:39:50","slug":"%e5%b8%b8%e7%94%a8%e7%b1%bb-%e8%a7%a3%e5%86%b3%e4%b8%80%e4%b8%aa%e6%8b%bc%e6%8e%a5%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1098","title":{"rendered":"\u5e38\u7528\u7c7b-\u89e3\u51b3\u4e00\u4e2a\u62fc\u63a5\u95ee\u9898"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P463;\r\n\r\nimport org.junit.jupiter.api.Test;\r\n\r\n\/**\r\n * String\u7684\u4f7f\u7528\r\n *\r\n * @author RichieZhang\r\n * @create 2022-10-22 \u4e0b\u5348 1:04\r\n *\/\r\npublic class StringTest {\r\n\r\n    \/*\r\n    \u7ed3\u8bba\uff1a\r\n    1.\u5e38\u91cf\u4e0e\u5e38\u91cf\u7684\u62fc\u63a5\u7ed3\u679c\u5728\u5e38\u91cf\u6c60\uff0c\u4e14\u5e38\u91cf\u6c60\u4e2d\u4e0d\u4f1a\u5b58\u5728\u76f8\u540c\u5185\u5bb9\u7684\u5e38\u91cf\u3002\r\n    2.\u53ea\u8981\u5176\u4e2d\u6709\u4e00\u4e2a\u662f\u53d8\u91cf\uff0c\u7ed3\u679c\u5c31\u5728\u5806\u4e2d\u3002\r\n    3.\u5982\u679c\u62fc\u63a5\u7684\u7ed3\u679c\u8c03\u7528intern()\u65b9\u6cd5\uff0c\u8fd4\u56de\u503c\u5c31\u5728\u5e38\u91cf\u6c60\u4e2d\r\n\r\n     *\/\r\n    @Test\r\n    public void test4(){\r\n        String s1 = \"javaEEhadoop\";\r\n        String s2 = \"javaEE\";\r\n        String s3 = s2 + \"hadoop\";\r\n        System.out.println(s1 == s3);\/\/false\r\n\r\n        final String s4 = \"javaEE\";\/\/s4:\u5e38\u91cf\r\n        String s5 = s4 + \"hadoop\";\r\n        System.out.println(s1 == s5);\/\/true\r\n    }\r\n\r\n    @Test\r\n    public void test3(){\r\n        String s1 = \"javaEE\";\r\n        String s2 = \"hadoop\";\r\n\r\n        String s3 = \"javaEEhadoop\";\r\n        String s4 = \"javaEE\" + \"hadoop\";\r\n        String s5 = s1 + \"hadoop\";\r\n        String s6 = \"javaEE\" + s2;\r\n        String s7 = s1 + s2;\r\n\r\n        System.out.println(s3 == s4);\/\/true\r\n        System.out.println(s3 == s5);\/\/false\r\n        System.out.println(s3 == s6);\/\/false\r\n        System.out.println(s3 == s7);\/\/fa;se\r\n        System.out.println(s5 == s6);\/\/false\r\n        System.out.println(s5 == s7);\/\/false\r\n        System.out.println(s6 == s7);\/\/false\r\n\r\n        String s8 = s6.intern();\/\/\u8fd4\u56de\u503c\u5f97\u5230\u7684s8\u4f7f\u7528\u7684\u5e38\u91cf\u503c\u4e2d\u5df2\u7ecf\u5b58\u5728\u7684\"javaEEhandoop\"\r\n        System.out.println(s3 == s8);\/\/true\r\n\r\n\r\n    }\r\n\r\n    \/*\r\n    String\u7684\u5b9e\u4f8b\u5316\u65b9\u5f0f\uff1a\r\n    \u65b9\u5f0f\u4e00\uff1a\u901a\u8fc7\u5b57\u9762\u91cf\u5b9a\u4e49\u7684\u65b9\u5f0f\r\n    \u65b9\u5f0f\u4e8c\uff1a\u901a\u8fc7new + \u6784\u9020\u5668\u7684\u65b9\u5f0f\r\n\r\n        \u9762\u8bd5\u9898\uff1aString s = new String(\"abc\");\u65b9\u5f0f\u521b\u5efa\u5bf9\u8c61\uff0c\u5728\u5185\u5b58\u4e2d\u521b\u5efa\u4e86\u51e0\u4e2a\u5bf9\u8c61\r\n        \u4e24\u4e2a\uff1a\u4e00\u4e2a\u662f\u5806\u7a7a\u95f4\u4e2dnew\u7ed3\u6784\uff0c\u53e6\u4e00\u4e2a\u662fchar&#91;]\u5bf9\u5e94\u7684\u5e38\u91cf\u6c60\u4e2d\u7684\u6570\u636e\uff1a\"abc\"\r\n\r\n\r\n     *\/\r\n    @Test\r\n    public void test2(){\r\n        \/\/\u901a\u8fc7\u5b57\u9762\u91cf\u5b9a\u4e49\u7684\u65b9\u5f0f\uff1a\u6b64\u65f6\u7684s1\u548cs2\u7684\u6570\u636ejavaEE\u58f0\u660e\u5728\u65b9\u6cd5\u533a\u4e2d\u7684\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u3002\r\n        String s1 = \"javaEE\";\r\n        String s2 = \"javaEE\";\r\n        \/\/\u901a\u8fc7new + \u6784\u9020\u5668\u7684\u65b9\u5f0f\uff1a\u6b64\u65f6\u7684s3\u548cs4\u4fdd\u5b58\u7684\u5730\u5740\u503c\uff0c\u662f\u6570\u636e\u5728\u5806\u7a7a\u95f4\u4e2d\u5f00\u8f9f\u7a7a\u95f4\u4ee5\u540e\u5bf9\u5e94\u7684\u5730\u5740\u503c\u3002\r\n        String s3 = new String(\"javaEE\");\r\n        String s4 = new String(\"javaEE\");\r\n\r\n        System.out.println(s1 == s2);\/\/true\r\n        System.out.println(s1 == s3);\/\/false\r\n        System.out.println(s1 == s4);\/\/false\r\n        System.out.println(s3 == s4);\/\/false\r\n        Person p1 = new Person(\"Tom\",12);\r\n        Person p2 = new Person(\"Tom\",12);\r\n\r\n        System.out.println(p1.name.equals(p2.name));\/\/true\r\n        System.out.println(p1.name == p2.name);\/\/true\r\n\r\n        p1.name = \"Jerry\";\r\n        System.out.println(p2.name);\r\n    }\r\n\r\n    \/*\r\n    String:\u5b57\u7b26\u4e32\uff0c\u4f7f\u7528\u4e00\u5bf9\"\"\u5f15\u8d77\u6765\u8868\u793a\u3002\r\n    1. String\u58f0\u660e\u4e3afinal\u7684\uff0c\u4e0d\u53ef\u88ab\u7ee7\u627f\r\n    2. String\u5b9e\u73b0\u4e86Serializable\u63a5\u53e3\uff1a\u8868\u793a\u5b57\u7b26\u4e32\u662f\u652f\u6301\u5e8f\u5217\u5316\u7684\u3002\r\n        \u5b9e\u73b0\u4e86Comparable\u63a5\u53e3\uff1a\u8868\u793aString\u53ef\u4ee5\u6bd4\u8f83\u5927\u5c0f\r\n    3. String\u5185\u90e8\u5b9a\u4e49\u4e86final char&#91;] value\u7528\u4e8e\u5b58\u50a8\u5b57\u7b26\u4e32\u6570\u636e\r\n    4. String:\u4ee3\u8868\u4e0d\u53ef\u53d8\u7684\u5b57\u7b26\u5e8f\u5217\u3002\u7b80\u79f0\uff1a\u4e0d\u53ef\u53d8\u6027\u3002\r\n        \u4f53\u73b0\uff1a1. \u5f53\u5bf9\u5b57\u7b26\u4e32\u91cd\u65b0\u8d4b\u503c\u65f6\uff0c\u9700\u8981\u91cd\u5199\u6307\u5b9a\u5185\u5b58\u533a\u57df\u8d4b\u503c\uff0c\u4e0d\u80fd\u4f7f\u7528\u539f\u6709\u7684value\u8fdb\u884c\u8d4b\u503c\u3002\r\n              2. \u5f53\u5bf9\u73b0\u6709\u7684\u5b57\u7b26\u4e32\u8fdb\u884c\u8fde\u63a5\u64cd\u4f5c\u65f6\uff0c\u4e5f\u9700\u8981\u91cd\u65b0\u6307\u5b9a\u5185\u5b58\u533a\u57df\u8d4b\u503c\uff0c\u4e0d\u80fd\u4f7f\u7528\u539f\u6709\u7684value\u8fdb\u884c\u8d4b\u503c\u3002\r\n              3. \u5f53\u8c03\u7528String\u7684replace()\u65b9\u6cd5\u4fee\u6539\u6307\u5b9a\u5b57\u7b26\u6216\u5b57\u7b26\u4e32\u65f6\uff0c\u4e5f\u9700\u8981\u91cd\u65b0\u6307\u5b9a\u5185\u5b58\u533a\u57df\u8d4b\u503c\uff0c\u4e0d\u80fd\u4f7f\u7528\u539f\u6709\u7684value\u8fdb\u884c\u8d4b\u503c\u3002\r\n    5. \u901a\u8fc7\u5b57\u9762\u91cf\u7684\u65b9\u5f0f\uff08\u533a\u522b\u4e8enew\uff09\u7ed9\u4e00\u4e2a\u5b57\u7b26\u4e32\u8d4b\u503c\uff0c\u6b64\u65f6\u7684\u5b57\u7b26\u4e32\u503c\u58f0\u660e\u5728\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u79cd\u3002\r\n    6. \u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u662f\u4e0d\u4f1a\u5b58\u50a8\u76f8\u540c\u5185\u5bb9\u7684\u5b57\u7b26\u4e32\u7684\u3002\r\n\r\n     *\/\r\n    @Test\r\n    public void test1(){\r\n        String s1 = \"abc\";\/\/\u5b57\u9762\u91cf\u7684\u5b9a\u4e49\u65b9\u5f0f\r\n        String s2 = \"abc\";\r\n        s1 = \"hello\";\r\n\r\n        System.out.println(s1 == s2);\/\/\u6bd4\u8f83s1\u548cs2\u7684\u5730\u5740\u503c\r\n\r\n        System.out.println(s1);\/\/hello\r\n        System.out.println(s2);\/\/abc\r\n\r\n        System.out.println(\"*******************\");\r\n\r\n        String s3 = \"abc\";\r\n        s3 += \"def\";\r\n        System.out.println(s3);\/\/abcdef\r\n        System.out.println(s2);\r\n\r\n        System.out.println(\"********************\");\r\n\r\n        String s4 = \"abc\";\r\n        String s5 = s4.replace('a', 'm');\r\n        System.out.println(s4);\/\/abc\r\n        System.out.println(s5);\/\/mbc\r\n    }\r\n}\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[46],"class_list":["post-1098","post","type-post","status-publish","format-standard","hentry","category-java-code","tag-java"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1098"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1098"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1098\/revisions"}],"predecessor-version":[{"id":1099,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1098\/revisions\/1099"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1098"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1098"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1098"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}