{"id":426,"date":"2023-09-06T11:28:43","date_gmt":"2023-07-13T11:41:18","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%9c%a8java%e4%b8%ad%ef%bc%8c%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d%ef%bc%9f\/"},"modified":"2025-08-02T07:09:48","modified_gmt":"2025-08-01T23:09:48","slug":"%e5%9c%a8java%e4%b8%ad%ef%bc%8c%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%ef%bc%8c%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d%ef%bc%9f\/","title":{"rendered":"Java +=\u64cd\u4f5c\u7b26\u8be6\u89e3\uff1a\u542b\u4e49\u3001\u7528\u6cd5\u4e0e\u5b9e\u4f8b\u89e3\u6790"},"content":{"rendered":"<p>\u8fd9\u662f\u52a0\u6cd5\u8d4b\u503c\u8fd0\u7b97\u7b26\u3002\u8ba9\u6211\u4eec\u6765\u4e86\u89e3Java\u4e2d\u7684+=\u8fd0\u7b97\u7b26\uff0c\u5e76\u5b66\u4f1a\u5728\u65e5\u5e38\u7f16\u7a0b\u4e2d\u4f7f\u7528\u5b83\u3002<\/p>\n<p>\u5728Java\u4e2d\uff0cx += y\u4e0ex = x + y\u662f\u76f8\u540c\u7684\u3002<\/p>\n<p>\u8fd9\u662f\u4e00\u4e2a\u590d\u5408\u8d4b\u503c\u8fd0\u7b97\u7b26\u3002\u6700\u5e38\u7528\u4e8e\u9012\u589e\u53d8\u91cf\u7684\u503c\uff0c\u56e0\u4e3ax++\u53ea\u4f1a\u5c06\u503c\u589e\u52a0\u4e00\u3002<\/p>\n<h2>\u4f7f\u7528 += \u8fd0\u7b97\u7b26\u9012\u589e\u503c<\/h2>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u4f1a\u5c06a\u7684\u503c\u589e\u52a02\u4e2a\u5355\u4f4d\u3002\u8ba9\u6211\u4eec\u770b\u4e00\u4e9b\u793a\u4f8b\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">=<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>\r\na<span class=\"token operator\">+=<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<div>\n                            <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648ab5a4b2f92e6c732914\/6-0.png\" class='post-images' alt=\"output \" title=\"\">\n                        <\/div>\n<p>\u53e6\u4e00\u65b9\u9762\uff0c\u5982\u679c\u6211\u4eec\u4f7f\u7528a++\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">=<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>\r\na<span class=\"token operator\">++<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<div>\n                            <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648ab5a4b2f92e6c732914\/9-0.png\" class='post-images' alt=\"Output 2 1\" title=\"\">\n                        <\/div>\n<p>a\u7684\u503c\u589e\u52a0\u4e861\u3002<\/p>\n<h2>\u5728Java\u5faa\u73af\u4e2d\u4f7f\u7528+=<\/h2>\n<p>\u5728for\u5faa\u73af\u4e2d\u4e5f\u53ef\u4ee5\u4f7f\u7528+=\u8fd0\u7b97\u7b26\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i<span class=\"token operator\">=<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&lt;<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">+=<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span>\r\n<span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<div>\n                            <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648ab5a4b2f92e6c732914\/14-0.png\" class='post-images' alt=\"For Loop Output 1\" title=\"\">\n                        <\/div>\n<p>\u6bcf\u6b21\u8fed\u4ee3\u4e2d\uff0ci\u7684\u503c\u589e\u52a02\u3002<\/p>\n<h2>\u4e0e\u591a\u79cd\u6570\u636e\u7c7b\u578b\u4e00\u8d77\u5de5\u4f5c<\/h2>\n<p>Java\u4e2d\u6709\u4e00\u70b9\u6709\u8da3\u7684\u662f\uff0c\u4f7f\u7528\u666e\u901a\u7684\u52a0\u6cd5\u8868\u8fbe\u5f0f\u5c06int\u52a0\u5230double\u4f1a\u5bfc\u81f4\u9519\u8bef\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">=<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>\r\na <span class=\"token operator\">=<\/span> a <span class=\"token operator\">+<\/span> <span class=\"token number\">1.1<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ Gives error <\/span>\r\na <span class=\"token operator\">+=<\/span> <span class=\"token number\">1.1<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<p>\u8fd9\u91cc\u7684\u7b2c\u4e00\u884c\u4ee3\u7801\u51fa\u9519\u4e86\uff0c\u56e0\u4e3a\u6574\u6570\u4e0d\u80fd\u4e0e\u6d6e\u70b9\u6570\u76f8\u52a0\u3002<\/p>\n<p>\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>error<span class=\"token operator\">:<\/span> incompatible types<span class=\"token operator\">:<\/span> possible lossy conversion from <span class=\"token keyword\">double<\/span> <span class=\"token keyword\">to<\/span> <span class=\"token keyword\">int<\/span>\r\na <span class=\"token operator\">=<\/span> a <span class=\"token operator\">+<\/span> <span class=\"token number\">1.1<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ Gives error <\/span>\r\n<\/code><\/pre>\n<p>\u7136\u800c\uff0c\u5728Java\u4e2d\u4f7f\u7528+=\u8fd0\u7b97\u7b26\u65f6\uff0c\u52a0\u6cd5\u8fd0\u7b97\u6548\u679c\u5f88\u597d\uff0c\u56e0\u4e3aJava\u4f1a\u5c06double\u8f6c\u6362\u4e3a\u6574\u6570\u503c\u5e76\u5c06\u5176\u4f5c\u4e3a1\u6dfb\u52a0\u3002\u4ee5\u4e0b\u662f\u4ec5\u4f7f\u7528+=\u8fd0\u7b97\u7b26\u8fdb\u884c\u52a0\u6cd5\u8fd0\u7b97\u65f6\u7684\u8f93\u51fa\u7ed3\u679c\u3002<\/p>\n<div>\n                            <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648ab5a4b2f92e6c732914\/23-0.png\" class='post-images' alt=\"Output\" title=\"\">\n                        <\/div>\n<p>E1 op= E2 \u76f8\u5f53\u4e8e E1 = (T) ((E1) op (E2))\uff0c\u5176\u4e2d T \u662f E1 \u7684\u7c7b\u578b\uff0c\u4f46 E1 \u53ea\u88ab\u8bc4\u4f30\u4e00\u6b21\u3002\u8fd9\u662f Java \u5728\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u4ee5\u5c06\u4e24\u4e2a\u6570\u5b57\u76f8\u52a0\u3002<\/p>\n<h2>\u5b57\u7b26\u4e32\u8fde\u63a5<\/h2>\n<p>&#8220;+=&#8221;\u8fd0\u7b97\u7b26\u4e5f\u53ef\u4ee5\u7528\u4e8e\u5b57\u7b26\u4e32\u7684\u53d8\u5f02\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token class-name\">String<\/span> a <span class=\"token operator\">=<\/span> <span class=\"token string\">\"Hello\"<\/span><span class=\"token punctuation\">;<\/span>\r\na<span class=\"token operator\">+=<\/span><span class=\"token string\">\"World\"<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<div>\n                            <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648ab5a4b2f92e6c732914\/28-0.png\" class='post-images' alt=\"String mutation Output\" title=\"\">\n                        <\/div>\n<p>\u5b57\u7b26\u4e32\u201cHello\u201d\u5df2\u7ecf\u53d1\u751f\u4e86\u53d8\u5f02\uff0c\u5e76\u4e14\u5b57\u7b26\u4e32\u201cWorld\u201d\u5df2\u7ecf\u88ab\u8fde\u63a5\u5230\u5b83\u4e0a\u9762\u3002<\/p>\n<h2>\u7ed3\u8bba<\/h2>\n<p>+= \u662f\u4e00\u4e2a\u91cd\u8981\u7684\u8d4b\u503c\u8fd0\u7b97\u7b26\u3002\u5b83\u6700\u5e38\u7528\u4e8e\u5faa\u73af\u3002\u540c\u6837\u7684\u8d4b\u503c\u8fd0\u7b97\u4e5f\u9002\u7528\u4e8e\u5176\u4ed6\u8fd0\u7b97\u7b26\uff0c\u6bd4\u5982 -=\u3001*=\u3001\/=\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u662f\u52a0\u6cd5\u8d4b\u503c\u8fd0\u7b97\u7b26\u3002\u8ba9\u6211\u4eec\u6765\u4e86\u89e3Java\u4e2d\u7684+=\u8fd0\u7b97\u7b26\uff0c\u5e76\u5b66\u4f1a\u5728\u65e5\u5e38\u7f16\u7a0b\u4e2d\u4f7f\u7528\u5b83\u3002 \u5728Java\u4e2d\uff0cx += y [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1340,189,183,1339,180],"class_list":["post-426","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-1340","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java +=\u64cd\u4f5c\u7b26\u8be6\u89e3\uff1a\u542b\u4e49\u3001\u7528\u6cd5\u4e0e\u5b9e\u4f8b\u89e3\u6790 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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+=\u64cd\u4f5c\u7b26\u8be6\u89e3\uff1a\u542b\u4e49\u3001\u7528\u6cd5\u4e0e\u5b9e\u4f8b\u89e3\u6790\" \/>\n<meta property=\"og:description\" content=\"\u672c\u6587\u8be6\u7ec6\u89e3\u6790Java\u4e2d\u7684+=\u64cd\u4f5c\u7b26\u7684\u542b\u4e49\u4e0e\u7528\u6cd5\uff0c\u901a\u8fc7\u5b9e\u4f8b\u6f14\u793a\u5982\u4f55\u5728Java\u7f16\u7a0b\u4e2d\u6b63\u786e\u4f7f\u7528+=\u590d\u5408\u8d4b\u503c\u64cd\u4f5c\u7b26\u3002\u9002\u5408Java\u521d\u5b66\u8005\u4e86\u89e3\u57fa\u7840\u8bed\u6cd5\uff0c\u5e2e\u52a9\u5f00\u53d1\u8005\u638c\u63e1\u8fd9\u4e00\u5e38\u7528\u64cd\u4f5c\u7b26\u7684\u5de5\u4f5c\u539f\u7406\u53ca\u5e94\u7528\u573a\u666f\uff0c\u63d0\u5347\u7f16\u7a0b\u6548\u7387\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5728java\u4e2d\uff0c\u662f\u4ec0\u4e48\u610f\u601d\uff1f\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-13T11:41:18+00:00\" \/>\n<meta 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class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%ef%bc%8c%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d%ef%bc%9f\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%ef%bc%8c%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d%ef%bc%9f\/\",\"name\":\"Java +=\u64cd\u4f5c\u7b26\u8be6\u89e3\uff1a\u542b\u4e49\u3001\u7528\u6cd5\u4e0e\u5b9e\u4f8b\u89e3\u6790 - Blog - Silicon 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