{"id":670,"date":"2022-02-18T23:29:27","date_gmt":"2022-02-18T15:29:27","guid":{"rendered":"https:\/\/axinyi.xuenixiang.com\/?p=670"},"modified":"2022-02-18T23:32:57","modified_gmt":"2022-02-18T15:32:57","slug":"javase-%e7%ac%ac%e4%b8%89%e7%ab%a0","status":"publish","type":"post","link":"https:\/\/axinyi.xuenixiang.com\/index.php\/2022\/02\/18\/javase-%e7%ac%ac%e4%b8%89%e7%ab%a0\/","title":{"rendered":"JavaSE-\u7b2c\u4e09\u7ae0"},"content":{"rendered":"\n<h1>\u7b2c\u4e09\u7ae0 \u9879\u76ee<\/h1>\n\n\n\n<h2>3.1 \u9700\u6c42<\/h2>\n\n\n\n<ul><li>CRUD\uff1a\u6dfb\u52a0\u3001\u4fee\u6539\u3001\u5220\u9664\u3001\u663e\u793a<\/li><li>\u628a\u6570\u636e\u5b58\u50a8\u5728\u6570\u7ec4\u4e2d<\/li><li>\u5b58\u50a8\u7684\u5185\u5bb9\u5c31\u662f\u57fa\u672c\u7c7b\u578b<\/li><\/ul>\n\n\n\n<h2>3.2 \u6570\u7ec4<\/h2>\n\n\n\n<ul><li>\u7279\u70b9\uff1a\u4e00\u7ec4\u7c7b\u578b\u76f8\u540c\u7684\u6570\u636e<\/li><li>\u6570\u7ec4\u7684\u957f\u5ea6\u4e00\u65e6\u786e\u5b9a\u5c31\u4e0d\u80fd\u4fee\u6539\u4e86<\/li><li>\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u4e0b\u6807\u4ece\u96f6\u5f00\u59cb<\/li><\/ul>\n\n\n\n<h3>3.2.1 \u6848\u4f8b<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args) {\n        \/\/\u521b\u5efa\u6570\u7ec4\n        int&#91;] array = new int&#91;3];\n        \/\/\u6309\u7167\u4e0b\u6807\u7684\u4f4d\u7f6e\u6dfb\u52a0\u5373\u53ef\n        array&#91;0] = 100;\n        array&#91;1] = 200;\n\n        \/\/\u66f4\u65b0\uff1a\u5c31\u662f\u66ff\u6362\u4e0b\u6807\u4f4d\u7f6e\u7684\u6570\u636e\n        array&#91;0] = 500;\n\n        \/\/\u5220\u9664\uff1a\u5c31\u662f\u628a\u6307\u5b9a\u4f4d\u7f6e\u7684\u6570\u636e\u8fd8\u539f\u4e3a\u9ed8\u8ba4\u503c\n        array&#91;1] = 0;\n    }\n}<\/code><\/pre>\n\n\n\n<h3>3.2.2 \u63a5\u6536\u63a7\u5236\u53f0\u6570\u636e<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Scanner;\npublic class TestDemo {\n    public static void main(String&#91;] args) {\n        \/\/\u63a5\u6536\u63a7\u5236\u53f0\u7684\u8f93\u5165\u6570\u636e\n        Scanner scanner = new Scanner(System.in);\n        \/\/\u63d0\u793a\u4fe1\u606f\n        System.out.println(\"\u8bf7\u8f93\u5165\u4e00\u4e2a\u6570\u5b57\");\n        int i = scanner.nextInt();\n        System.out.println(\"i=\"+i);\n    }\n}<\/code><\/pre>\n\n\n\n<h2>3.3 \u5b8c\u6210\u9879\u76ee\u529f\u80fd-\u7b2c\u4e00\u7248<\/h2>\n\n\n\n<h3>3.3.1 \u642d\u5efa\u5f00\u53d1\u73af\u5883<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Scanner;\n\npublic class TestDemo {\n    public static void main(String&#91;] args) {\n        \/\/\u521b\u5efa\u63a7\u5236\u53f0\u5bf9\u8c61\n        Scanner scanner = new Scanner(System.in);\n        \/\/\u521b\u5efa\u4e00\u4e2a\u6570\u7ec4\uff0c\u5b58\u50a8\u6570\u636e\n        int&#91;] array = new int&#91;5];\n\n        \/\/\u4e3a\u4e86\u8df3\u51fa\u591a\u652f\u521b\u5efa\u4e00\u4e2a\u5e03\u5c14\u7c7b\u578b\n        boolean flag = true;\n\n        \/\/\u63d0\u793a\u6d88\u606f\n        System.out.println(\"1\u8868\u793a\u6dfb\u52a0;2\u8868\u793a\u663e\u793a;3\u8868\u793a\u5220\u9664;4\u8868\u793a\u66f4\u65b0;5\u9000\u51fa;\");\n        \/\/\u4f7f\u7528do-while\n        do {\n            \/\/\u521b\u5efakey\n            int key = scanner.nextInt();\n            \/\/\u591a\u652f\u5224\u65ad\n            switch (key){\n                case 1:\n                    System.out.println(\"\u6dfb\u52a0\");\n                    break;\n                case 2:\n                    System.out.println(\"\u663e\u793a\");\n                    break;\n                case 3:\n                    System.out.println(\"\u5220\u9664\");\n                    break;\n                case 4:\n                    System.out.println(\"\u66f4\u65b0\");\n                    break;\n                case 5:\n                    flag = false;\n                    break;\n            }\n        }while(flag);\n    }\n}<\/code><\/pre>\n\n\n\n<h3>3.2.2 \u83b7\u53d6\u6570\u7ec4\u4e2d\u7684\u5143\u7d20<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Demo {\n    public static void main(String&#91;] args){\n        int&#91;] array = new int&#91;3];\n        array&#91;0] = 100;\n        array&#91;1] = 200;\n        array&#91;2] = 300;\n\n        \/\/\u5faa\u73af\u83b7\u53d6\u5143\u7d20\n        System.out.println(\"\u6570\u7ec4\u957f\u5ea6=\"+array.length);\n        \n        \/\/\u83b7\u53d6\u5143\u7d20              System.out.println(array&#91;1]);\n        \n        for (int index = 0; index &lt; array.length; index++){\n            System.out.println(array&#91;index]);\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h3>3.3.2 \u529f\u80fd\u5b9e\u73b0\u7f16\u5199<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Scanner;\n\npublic class TestDemo {\n    public static void main(String&#91;] args) {\n        \/\/\u521b\u5efa\u63a7\u5236\u53f0\u5bf9\u8c61\n        Scanner scanner = new Scanner(System.in);\n        \/\/\u521b\u5efa\u4e00\u4e2a\u6570\u7ec4\uff0c\u5b58\u50a8\u6570\u636e\n        int&#91;] array = new int&#91;5];\n\n        \/\/\u4e3a\u4e86\u8df3\u51fa\u591a\u652f\u521b\u5efa\u4e00\u4e2a\u5e03\u5c14\u7c7b\u578b\n        boolean flag = true;\n\n        \/\/\u63d0\u793a\u6d88\u606f\n        System.out.println(\"1\u8868\u793a\u6dfb\u52a0;2\u8868\u793a\u663e\u793a;3\u8868\u793a\u5220\u9664;4\u8868\u793a\u66f4\u65b0;5\u9000\u51fa;\");\n        \/\/\u4f7f\u7528do-while\n        do {\n            \/\/\u521b\u5efakey\n            int key = scanner.nextInt();\n            \/\/\u591a\u652f\u5224\u65ad\n            switch (key){\n                case 1:\n                   \/\/\u901a\u8fc7\u5faa\u73af\u83b7\u53d6\u4e00\u4e2a\u7a7a\u4f4d\u7f6e\n                    for (int index = 0; index &lt; array.length; index++){\n                        if (array&#91;index] == 0){\n                            System.out.println(\"\u8bf7\u8f93\u5165\u4e00\u4e2a\u6570\u5b57\");\n                            array&#91;index] = scanner.nextInt();\n                            System.out.println(\"\u6dfb\u52a0\u6210\u529f\");\n                            \/\/\u8df3\u51fa\u5faa\u73af\u4f53\n                            break;\n                        }\n                    }\n                    break;\n                case 2:\n                    for (int index = 0;index &lt; array.length; index++){\n                        int element = array&#91;index];\n                        if (element != 0){\n                            System.out.println(array&#91;index]);\n\n                        }\n                    }\n\n                    break;\n                case 3:\n                    \/\/\u63d0\u793a\n                    System.out.println(\"\u8bf7\u8f93\u5165\u4e00\u4e2a\u4f60\u8981\u5220\u9664\u7684\u6570\u5b57\");\n                    int el = scanner.nextInt();\n                    for (int index = 0; index &lt; array.length; index++){\/\/\u627e\u5230\u4e86\n                        if (array&#91;index] == el){\n                            array&#91;index] = 0;\n                            System.out.println(\"\u5220\u9664\u6210\u529f\uff01\");\n                            \/\/\u8df3\u51fa\u5faa\u73af\u4f53\n                            break;\n                        }\n                    }\n                    break;\n                case 4:\n                    System.out.println(\"\u8bf7\u8f93\u5165\u4e00\u4e2a\u4f60\u8981\u66f4\u65b0\u7684\u6570\u5b57\");\n                    int el1 = scanner.nextInt();\n                    for (int index = 0; index &lt; array.length; index++){\n                        if (array&#91;index] == el1){\/\/\u627e\u5230\u4e86\n                            System.out.println(\"\u8bf7\u8f93\u5165\u4f60\u8981\u66f4\u65b0\u7684\u503c\");\n                            array&#91;index] = scanner.nextInt();\n                            System.out.println(\"\u66f4\u65b0\u6210\u529f\");\n                            \/\/\u8df3\u51fa\u5faa\u73af\n                            break;\n                        }\n                    }\n                    break;\n                case 5:\n                    flag = false;\n                    break;\n            }\n        }while(flag);\n    }\n}<\/code><\/pre>\n\n\n\n<h2>3.4 \u7b2c\u4e8c\u7248-\u4f18\u5316<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Scanner;\n\npublic class TestDemo {\n    public static void main(String&#91;] args) {\n        \/\/\u521b\u5efa\u63a7\u5236\u53f0\u5bf9\u8c61\n        Scanner scanner = new Scanner(System.in);\n        \/\/\u521b\u5efa\u4e00\u4e2a\u6570\u7ec4\uff0c\u5b58\u50a8\u6570\u636e\n        int&#91;] array = new int&#91;5];\n\n        \/\/\u4e3a\u4e86\u8df3\u51fa\u591a\u652f\u521b\u5efa\u4e00\u4e2a\u5e03\u5c14\u7c7b\u578b\n        boolean flag = true;\n\n        \/\/\u63d0\u793a\u6d88\u606f\n        System.out.println(\"1\u8868\u793a\u6dfb\u52a0;2\u8868\u793a\u663e\u793a;3\u8868\u793a\u5220\u9664;4\u8868\u793a\u66f4\u65b0;5\u9000\u51fa;\");\n        \/\/\u4f7f\u7528do-while\n        do {\n            \/\/\u521b\u5efakey\n            int key = scanner.nextInt();\n            \/\/\u591a\u652f\u5224\u65ad\n            switch (key){\n                case 1:\n                    \/\/\u901a\u8fc7\u5faa\u73af\u83b7\u53d6\u4e00\u4e2a\u7a7a\u4f4d\u7f6e\n                    \/\/\u5b9a\u4e49\u5e03\u5c14\u7c7b\u578b\u53d8\u91cf\u5224\u65ad\u6570\u7ec4\u662f\u5426\u5360\u6ee1\n                    boolean full = true;\n                    for (int index = 0; index &lt; array.length; index++){\n                        if (array&#91;index] == 0){\n                            full = false; \/\/\u8fdb\u5165\u6761\u4ef6\u5224\u65ad\u8bf4\u660e\u6570\u7ec4\u672a\u6ee1\n                            System.out.println(\"\u8bf7\u8f93\u5165\u4e00\u4e2a\u6570\u5b57\");\n                            array&#91;index] = scanner.nextInt();\n                            System.out.println(\"\u6dfb\u52a0\u6210\u529f\");\n                            \/\/\u8df3\u51fa\u5faa\u73af\u4f53\n                            break;\n                        }\n                    }\n                    if (full){ \/\/full\u4e3a\u771f\u8868\u793a\u6570\u7ec4\u6ee1\u4e86\n                        System.out.println(\"\u6570\u7ec4\u5df2\u7ecf\u6ee1\u4e86\");\n                    }\n                    break;\n                case 2:\n                    for (int index = 0;index &lt; array.length; index++){\n                        int element = array&#91;index];\n                        if (element != 0){\n                            System.out.println(array&#91;index]);\n\n                        }\n                    }\n\n                    break;\n                case 3:\n                    \/\/\u63d0\u793a\n                    System.out.println(\"\u8bf7\u8f93\u5165\u4e00\u4e2a\u4f60\u8981\u5220\u9664\u7684\u6570\u5b57\");\n                    \/\/\u5b9a\u4e49\u5e03\u5c14\u578b\u53d8\u91cf\u5224\u65ad\u5220\u9664\u7684\u6570\u5b57\u6570\u7ec4\u91cc\u6709\u6ca1\u6709\n                    boolean f = true;\n                    int el = scanner.nextInt();\n                    for (int index = 0; index &lt; array.length; index++){\/\/\u627e\u5230\u4e86\n                        if (array&#91;index] == el){\n                            f = false; \/\/\u8fdb\u5165\u5224\u65ad\u8bf4\u660e\u9700\u8981\u5220\u9664\u7684\u6570\u5b57\u5728\u6570\u7ec4\u4e2d\n                            array&#91;index] = 0;\n                            System.out.println(\"\u5220\u9664\u6210\u529f\uff01\");\n                            \/\/\u8df3\u51fa\u5faa\u73af\u4f53\n                            break;\n                        }\n                    }\n                    if (f) { \/\/\u8bf4\u660e\u8f93\u5165\u7684\u6570\u4e0d\u5b58\u5728\n                        System.out.println(\"\u8f93\u5165\u7684\u6570\u4e0d\u5b58\u5728\");\n                    }\n                    break;\n                case 4:\n                    System.out.println(\"\u8bf7\u8f93\u5165\u4e00\u4e2a\u4f60\u8981\u66f4\u65b0\u7684\u6570\u5b57\");\n                    \/\/\u5b9a\u4e49\u5e03\u5c14\u7c7b\u578b\u53d8\u91cf\uff0c\u5224\u65ad\u9700\u8981\u66f4\u65b0\u7684\u6570\u5b57\u662f\u5426\u5728\u6570\u7ec4\u4e2d\n                    boolean f1 = true;\n                    int el1 = scanner.nextInt();\n                    for (int index = 0; index &lt; array.length; index++){\n                        if (array&#91;index] == el1){\/\/\u627e\u5230\u4e86\n                            f1 = false; \/\/\u8fdb\u5165\u5224\u65ad\u8bf4\u660e\u6570\u7ec4\u4e2d\u5b58\u5728\u9700\u8981\u66f4\u65b0\u7684\u6570\u5b57\n                            System.out.println(\"\u8bf7\u8f93\u5165\u4f60\u8981\u66f4\u65b0\u7684\u503c\");\n                            array&#91;index] = scanner.nextInt();\n                            System.out.println(\"\u66f4\u65b0\u6210\u529f\");\n                            \/\/\u8df3\u51fa\u5faa\u73af\n                            break;\n                        }\n                    }\n                    if (f1){\n                        System.out.println(\"\u8f93\u5165\u7684\u6570\u4e0d\u5b58\u5728\");\n                    }\n                    break;\n                case 5:\n                    flag = false;\n                    break;\n            }\n        }while(flag);\n    }\n}<\/code><\/pre>\n\n\n\n<p><div class=\"has-toc have-toc\"><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7b2c\u4e09\u7ae0 \u9879\u76ee 3.1 \u9700\u6c42 CRUD\uff1a\u6dfb\u52a0\u3001\u4fee\u6539\u3001\u5220\u9664\u3001\u663e\u793a \u628a\u6570\u636e\u5b58\u50a8\u5728\u6570\u7ec4\u4e2d \u5b58\u50a8\u7684\u5185\u5bb9\u5c31\u662f\u57fa\u672c\u7c7b\u578b 3.2 \u6570\u7ec4 \u7279\u70b9\uff1a\u4e00\u7ec4 &#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[],"_links":{"self":[{"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/posts\/670"}],"collection":[{"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/comments?post=670"}],"version-history":[{"count":2,"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/posts\/670\/revisions"}],"predecessor-version":[{"id":672,"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/posts\/670\/revisions\/672"}],"wp:attachment":[{"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/media?parent=670"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/categories?post=670"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/tags?post=670"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}