map\u4e00\u822c\u7528\u4e8ekey-value\u952e\u503c\u5bf9\u7684\u5b58\u653e\u3002\u5728groovy\u4e2d\u4f60\u53ef\u4ee5\u4f7f\u7528\u4e24\u79cd\u65b9\u5f0f\u5b9a\u4e49map\uff1a<\/p>\n
\u53ef\u4ee5\u5bf9\u6bd4\u4e00\u4e0b\u4e24\u79cd\u65b9\u5f0f\u7684\u5dee\u522b\u548c\u7528\u6cd5\u3002<\/p>\n
\/\/\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u7684map\ndef emptyStudentMap = [:]\nprintln emptyStudentMap \/\/ [:]\n\n\/\/\u5b9a\u4e49\u5e26\u6709\u521d\u59cb\u503c\u7684map\ndef studentMapWithInitialValue = [name: "John", surname: "Doe", age: 17]\nprintln studentMapWithInitialValue \/\/ [name:John, surname:Doe, age:17]<\/code><\/pre>\n\u9700\u8981\u6ce8\u610f\u7684\u662f[]<\/code>\u4e2d\u7684\u5192\u53f7:<\/code>\uff0c\u8868\u660e\u8fd9\u662f\u4e00\u4e2amap\u800c\u4e0d\u662flist<\/p>\n\u800c\u5bf9\u4e8emap\u4e2d\u7684\u521d\u59cb\u503c\uff0ckey\u503c\u662f\u4e0d\u9700\u8981\u53cc\u5f15\u53f7""<\/code>\u7684\uff0c\u9ed8\u8ba4\u90fd\u662f\u5b57\u7b26\u4e32\u7c7b\u578b\u3002<\/p>\nmap\u4e2d\u6dfb\u52a0\u952e\u503c\u5bf9<\/h2>\n
groovy\u4e2d\u6dfb\u52a0\u952e\u503c\u5bf9\u53ef\u4ee5\u91c7\u7528\u591a\u79cd\u65b9\u5f0f\uff0c\u64cd\u4f5c\u8d77\u6765\u5341\u5206\u65b9\u4fbf\uff0c\u5177\u4f53\u8bf7\u770b\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n
def student = [:] \/\/ \u5b9a\u4e49\u4e00\u4e2a\u7a7a\u7684map\nstudent.put('name', 'John') \/\/ java\u8bed\u6cd5\u7684\u65b9\u5f0f\u6dfb\u52a0\u952e\u503c\u5bf9\nstudent['surname'] = 'Doe' \/\/ \u4e5f\u53ef\u4ee5\u4f7f\u7528\u4e2d\u62ec\u53f7\u7684\u65b9\u5f0f\u6dfb\u52a0\u952e\u503c\u5bf9\nstudent << [age: 17] \/\/ \u8fd9\u79cd\u65b9\u5f0f\u7c7b\u4f3c\u4e8eunix\u7684\u91cd\u5b9a\u5411\u7b26\u53f7\uff0c\u5c06\u952e\u503c\u5bf9\u653e\u5230map\u4e2d\nstudent.class = "11C" \/\/\u4f7f\u7528.\u70b9\u53f7\u7684\u65b9\u5f0f\u4e5f\u662f\u53ef\u4ee5\u7684\nstudent.'school' = "Groovy School" \/\/\u540c\u4e0a\u9762\u7c7b\u4f3c\uff0c\u4f46\u662f\u53ef\u4ee5\u653e\u4e00\u4e9b\u7279\u6b8a\u7b26\u53f7\n\nprintln student \/\/ [name:John, surname:Doe, age:17, class:11C, school:Groovy School]<\/code><\/pre>\nmap\u4e2d\u5220\u9664\u952e\u503c\u5bf9<\/h2>\n
\u4ecemap\u4e2d\u5220\u9664\u952e\u503c\u5bf9\u50cf\u6dfb\u52a0\u4e00\u6837\u7b80\u5355\uff0c\u4f60\u53ef\u4ee5\u7528\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\u5220\u9664\u3002<\/p>\n
def student = [name: 'John', surname: 'Doe', age: 17, class: '11C', school: 'Groovy School']\nprintln student \/\/ [name:John, surname:Doe, age:17, class:11C, school:Groovy School]\n\n\/\/\u4f7f\u7528remove\u65b9\u6cd5\u5220\u9664\nstudent.remove('age') \/\/ Remove by key\nprintln student \/\/ [name:John, surname:Doe, class:11C, school:Groovy School]\n\n\/\/\u4f7f\u7528\u51cf\u6cd5\u5220\u9664\uff0c\u4e0d\u4f1a\u6539\u53d8\u539fmap\nstudent = student - [school: 'Groovy School'] \/\/ This is something like arithmetic operation\nprintln student \/\/ [name:John, surname:Doe, class:11C]<\/code><\/pre>\nmap\u83b7\u53d6\u503c\u4e3anull\u65f6\u8fd4\u56de\u9ed8\u8ba4\u503c<\/h2>\n
\u6709\u65f6\u5019\uff0c\u6211\u4eec\u9700\u8981\u5bf9\u4e8emap\u4e2d\u7684\u8fd4\u56de\u503c\u8c03\u7528\u51fd\u6570\uff0c\u5982\u679c\u8fd4\u56de\u503c\u4e3anull\u7684\u65f6\u5019\u4f1a\u62a5NullPointerException<\/code>\u3002\u4e3a\u4e86\u907f\u514d\u51fa\u73b0\u8fd9\u4e2a\u5f02\u5e38\uff0c\u9700\u8981\u68c0\u67e5\u662f\u5426\u4e3anull\u3002groovy\u4e3a\u4e86\u907f\u514d\u6211\u4eec\u83b7\u53d6\u5230null\uff0c\u63d0\u4f9b\u4e86\u65b9\u6cd5\u5f53\u8fd4\u56de\u503c\u4e3anull\u65f6\uff0c\u81ea\u52a8\u8fd4\u56de\u9ed8\u8ba4\u503c\u3002\u8bf7\u53c2\u8003\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\ndef student = [name: 'John', surname: 'Doe', age: 17, class: '11C', school: 'Groovy School']\n\n\/\/map\u4e2d\u4e0d\u5b58\u5728key\u4e3a'teacher'\u7684\u952e\u503c\u5bf9\uff0c\u6240\u4ee5\u8fd4\u56denew Teacher(name : "Betty")\ndef result = student.get('teacher', new Teacher(name: "Betty"))\n\nprintln result \/\/ Teacher(name:Betty)<\/code><\/pre>\n\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cmap\u4e2d\u4e0d\u5b58\u5728’teacher’\u6240\u4ee5\u8fd4\u56denew Teacher()<\/code>\uff0c\u56e0\u6b64\u4e0d\u9700\u8981\u6211\u4eec\u8003\u8651NullPointerException<\/code>\u7684\u5904\u7406\u3002<\/p>\nmap\u5408\u5e76<\/h2>\n
groovy\u4e2d\u7684map\u5408\u5e76\u4e5f\u662f\u975e\u5e38\u7b80\u5355\uff0c\u5c31\u50cf\u5b57\u7b26\u4e32\u8fde\u63a5\u90a3\u6837\u3002<\/p>\n
def studentProp1 = [name: 'John', surname: 'Doe']\ndef studentProp2 = [age: 17, class: '11C']\ndef studentProp3 = [school: 'Groovy School']\n\n\/\/\u4f7f\u7528\u52a0\u6cd5\u5408\u5e76\u591a\u4e2amap\ndef student = studentProp1 + studentProp2 + studentProp3\n\n\/\/\u5408\u5e76\u540e\u7684\u7ed3\u679c\nprintln student \/\/ [name:John, surname:Doe, age:17, class:11C, school:Groovy School]<\/code><\/pre>\nmap\u5bf9\u8c61\u5408\u5e76\u5728groovy\u4e2d\u53ef\u4ee5\u5f88\u5bb9\u6613\u5b9e\u73b0\uff0c\u4ee3\u7801\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n
1\uff09\u4f7f\u7528+\u53f7<\/p>\n
assert [ a: true, b: false ] + [ a: false ] == [ a: false, b: false ]<\/code><\/pre>\n2\uff09\u6216\u8005\u4f7f\u7528\u5de6\u79fb\u64cd\u4f5c\uff0c\u4ee3\u7801\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n
assert [ a: true, b: false ] << [ a: false ] == [ a: false, b: false ]<\/code><\/pre>\n\u4e24\u8005\u7684\u533a\u522b\u662f\uff1a<\/p>\n
\n- \u5de6\u79fb\u64cd\u4f5c\u662f\u628a\u53f3\u8fb9\u7684map\u5408\u5e76\u5230\u5de6\u8fb9\u7684map\u4e2d\uff0c\u6539\u53d8\u4e86\u5de6\u8fb9map\u7684\u5185\u5bb9<\/li>\n
- \u4f7f\u7528
+<\/code>\u5219\u6839\u636e\u5de6\u8fb9\u7684map\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684map\uff0c\u5e76\u5c06\u53f3\u8fb9\u7684map\u5408\u5e76\u5230\u65b0map\u4e2d<\/li>\n<\/ul>\n\u83b7\u53d6\u4e24\u4e2amap\u7684\u4ea4\u96c6<\/h2>\n
\u6709\u65f6\u5019\u5f53\u4f60\u9700\u8981\u5728\u4e0d\u540c\u7684map\u4e2d\u67e5\u627e\u76f8\u540c\u952e\u503c\u5bf9\u7684\u65f6\u5019\uff0cgroovy\u4e3a\u4e86\u63d0\u4f9b\u4e86\u65b9\u4fbf\u7684\u65b9\u6cd5\u83b7\u53d6map\u4ea4\u96c6\u3002<\/p>\n
def student1 = [name: 'John', surname: 'Doe', age: 17]\ndef student2 = [surname: 'Bunny', age: 17]\n\n\/\/\u83b7\u53d6student1\u548cstudent2\u7684\u4ea4\u96c6\ndef sameProperties = student1.intersect(student2) \/\/ [age: 17]\n\nprintln sameProperties \/\/ [age:17]<\/code><\/pre>\n\u4ee5\u4e0a\u4ee3\u7801\u4f1a\u627e\u51fastudent1\u548cstudent2\u4e24\u4e2amap\u7684\u952e\u503c\u5bf9\u4ea4\u96c6\u3002\u5bb9\u6613\u53d1\u73b0age:17<\/code>\u662f\u4e24\u4e2amap\u90fd\u6709\u7684\u952e\u503c\u5bf9\uff0c\u4ea4\u96c6\u4e3a[age:17]<\/code><\/p>\n\u83b7\u53d6map\u7684\u952e(key)\u96c6\u5408\u4e0e\u503c(value)\u96c6\u5408<\/h2>\n
groovy\u4e2d\u53ef\u4ee5\u50cfjava\u4e2d\u90a3\u6837\u83b7\u53d6map\u7684\u952e\u3001\u503c\u7684\u96c6\u5408\u3002<\/p>\n
def student = [name: 'John', surname: 'Doe', age: 17]\n\n\/\/\u83b7\u53d6\u952ekey\u96c6\u5408\ndef studentKeys = student.keySet() \/\/ [name, surname, age]\nprintln studentKeys \/\/ [name, surname, age]\n\n\/\/\u83b7\u53d6\u503cvalue\u96c6\u5408\ndef studentValues = student.values() \/\/ [John, Doe, age]\nprintln studentValues \/\/ [John, Doe, 17]<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"map\u7684\u5b9a\u4e49 map\u4e00\u822c\u7528\u4e8ekey-value\u952e\u503c\u5bf9\u7684\u5b58\u653e\u3002\u5728groovy\u4e2d\u4f60\u53ef\u4ee5\u4f7f\u7528\u4e24\u79cd\u65b9\u5f0f\u5b9a\u4e49map\uff1a 1 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[568],"tags":[],"class_list":["post-2233","post","type-post","status-publish","format-standard","hentry","category-groovy"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/2233","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=2233"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/2233\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=2233"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=2233"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=2233"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}