{"id":10021399,"date":"2026-07-07T23:35:21","date_gmt":"2026-07-07T15:35:21","guid":{"rendered":"https:\/\/itmax.cn\/?p=10021399"},"modified":"2026-07-07T23:35:21","modified_gmt":"2026-07-07T15:35:21","slug":"%e6%b5%85%e6%9e%90%e5%86%85%e9%83%a8%e7%b1%bb%ef%bc%8c%e7%90%86%e8%a7%a3java%e4%b8%ad%e7%9a%84this","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10021399","title":{"rendered":"\u6d45\u6790\u5185\u90e8\u7c7b\uff0c\u7406\u89e3Java\u4e2d\u7684this"},"content":{"rendered":"

\u95ee\u9898\u80cc\u666f<\/h2>\n

\u4e4b\u524d\u770b\u4ee3\u7801\u7684\u65f6\u5019\u4e0d\u61c2\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528var that = this;<\/code>\u6765\u4fdd\u7559this\u5173\u952e\u5b57\uff0c\u672c\u6587\u6df1\u5165\u4e86\u89e3\u4e00\u4e0b\u3002
\u90e8\u5206\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n

@Override\npublic Pair<Long, Long> updateInventoryAndCostPriceForPurchase(List<InboundOrderDto.SaveRequest.StockTransactionRequest> items) {\n    \/\/ \u4fdd\u5b58this\u5f15\u7528\n    var that = this;\n\n    \/\/ \u521b\u5efa\u7528\u4e8e\u66f4\u65b0\u5e93\u5b58\u7684\u57fa\u672c\u5bf9\u8c61\n    Iterable<UpdateInventoryItem> updateInventoryItems = items.stream()\n            .map(item -> new UpdateInventoryItem() {\n                @Override\n                public UUID skuUuid() {\n                    return item.getSku().getUuid();\n                }\n\n                @Override\n                public Long stockUnitRatio() {\n                    Long sellingUnitId = uuidCacheService.uuidToId(item.getSellingUnitUuid(), sellingUnitRepository).orElseThrow(EntityNotFoundException::new);\n                    SellingUnit sellingUnit = that.sellingUnitRepository.findById(sellingUnitId).orElseThrow(EntityNotFoundException::new);\n\n                    if (!sellingUnit.getProductSkuId().equals(uuidCacheService.uuidToId(item.getSku().getUuid(), productSkuRepository).orElseThrow(EntityNotFoundException::new))) {\n                        throw new IllegalStateException();\n                    }\n                    return sellingUnit.getRatio();\n                }\n            }).collect(Collectors.toList());\n\n}<\/code><\/pre>\n
\u4e4b\u524d\u8ba4\u4e3athis\u5173\u952e\u5b57\u6c38\u8fdc\u6307\u5411\u5f53\u524d\u7c7b\u3002\u6bd4\u5982\uff1a<\/p>\n
public class UserController {\n     private UserService userService; \n\n    public void page() {\n      this.userService.page();\n    }\n}<\/code><\/pre>\n
\u8fd9\u91cc\u7684this\u6307\u5411\u7684\u662fUserController\u3002\u4f46\u662f\u5728\u5185\u90e8\u7c7b\u4e2d\u5e76\u4e0d\u662f\u8fd9\u6837\u3002
\u6211\u4eec\u9996\u5148\u4e86\u89e3\u4e00\u4e0b\u4ec0\u4e48\u662f\u5185\u90e8\u7c7b\u3002<\/p>\n
\u5185\u90e8\u7c7b<\/h2>\n
\u83dc\u9e1f\u6559\u7a0b<\/a>\u4e2d\u5173\u4e8e\u5185\u90e8\u7c7b\u662f\u8fd9\u6837\u4ecb\u7ecd\u7684\uff1a<\/p>\n
\u5728 Java \u4e2d\uff0c\u53ef\u4ee5\u5c06\u4e00\u4e2a\u7c7b\u5b9a\u4e49\u5728\u53e6\u4e00\u4e2a\u7c7b\u91cc\u9762\u6216\u8005\u4e00\u4e2a\u65b9\u6cd5\u91cc\u9762\uff0c\u8fd9\u6837\u7684\u7c7b\u79f0\u4e3a\u5185\u90e8\u7c7b\u3002\u5e7f\u6cdb\u610f\u4e49\u4e0a\u7684\u5185\u90e8\u7c7b\u4e00\u822c\u6765\u8bf4\u5305\u62ec\u8fd9\u56db\u79cd\uff1a\u6210\u5458\u5185\u90e8\u7c7b\u3001\u5c40\u90e8\u5185\u90e8\u7c7b\u3001\u533f\u540d\u5185\u90e8\u7c7b\u548c\u9759\u6001\u5185\u90e8\u7c7b\u3002<\/p><\/blockquote>\n
\u8fd9\u91cc\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b\u6210\u5458\u5185\u90e8\u7c7b<\/strong>\u548c\u533f\u540d\u5185\u90e8\u7c7b<\/strong><\/p>\n
\u6210\u5458\u5185\u90e8\u7c7b<\/h3>\n
\u6210\u5458\u5185\u90e8\u7c7b\u662f\u6700\u666e\u901a\u7684\u5185\u90e8\u7c7b\uff0c\u5b9a\u4e49\u4e3a\u4f4d\u4e8e\u53e6\u4e00\u4e2a\u7c7b\u7684\u5185\u90e8<\/strong>\u3002<\/p>\n
class Outer {\n    private String name;\n    Outer(String name) {\n        this.name = name;\n    }\n    class Inner {\n        void hello() {\n            System.out.println("Hello, " + Outer.this.name);\n        }\n    }\n}<\/code><\/pre>\n
Outer<\/code>\u662f\u4e00\u4e2a\u666e\u901a\u7c7b\uff0cInner<\/code>\u662f\u6210\u5458\u5185\u90e8\u7c7b\u3002\u6210\u5458\u5185\u90e8\u7c7b\u662f\u4f9d\u9644\u5916\u90e8\u7c7b\u800c\u5b58\u5728\u7684\uff0c\u5982\u679c\u60f3\u8981\u521b\u5efa\u6210\u5458\u5185\u90e8\u7c7bInner<\/code>\u7684\u5bf9\u8c61\uff0c\u5fc5\u987b\u5b58\u5728\u4e00\u4e2a\u5916\u90e8\u7c7b\u7684\u5bf9\u8c61\u3002<\/p>\n
public class Main {\n  public static void main(String[] args) {\n    Outer outer = new Outer("\u5f20\u4e09");\n    \/\/ \u5fc5\u987b\u901a\u8fc7Outer\u5bf9\u8c61\u6765\u521b\u5efa\n    Outer.Inner inner = outer.new Inner();\n    inner.hello();\n  }\n}<\/code><\/pre>\n
\u4e3a\u4ec0\u4e48Inner\u80fd\u8bbf\u95eeOuter\u7684private\u6210\u5458
\u4e3a\u4ec0\u4e48\u5b9e\u4f8b\u5316Inner\u9700\u8981\u4f9d\u8d56\u4e8eOuter\u5bf9\u8c61<\/p><\/blockquote>\n
\u6210\u5458\u5185\u90e8\u7c7b\u5e76\u4e0d\u662f\u5b8c\u5168\u72ec\u7acb\u7684\u5bf9\u8c61\uff0c\u6bcf\u4e00\u4e2aInner\u5bf9\u8c61\uff0c\u90fd\u9ed8\u8ba4\u7ed1\u5b9a\u4e86\u4e00\u4e2aOuter\u5bf9\u8c61<\/p>\n
Outer outer = new Outer("\u5f20\u4e09");\nOuter.Inner inner = outer.new Inner();<\/code><\/pre>\n
\u5b9e\u9645\u4e0a\u66f4\u50cf<\/p>\n
Inner inner = new Inner(outer);<\/code><\/pre>\n
Inner\u7c7b\u4e2d\u9664\u4e86\u6709\u4e00\u4e2athis\u6307\u5411\u81ea\u5df1\uff0c\u8fd8\u9690\u542b\u5730\u6301\u6709\u4e00\u4e2aOuter\u5b9e\u4f8b\uff0c\u53ef\u4ee5\u7528Outer.this\u8bbf\u95ee\u5916\u90e8\u7c7b\u5bf9\u8c61\u3002<\/p>\n
\u67e5\u770bInner\u7684\u53cd\u7f16\u8bd1\u4ee3\u7801\uff1a<\/p>\n
class Outer$Inner {\n    Outer$Inner(final Outer this$0) {\n        this.this$0 = this$0;\n    }\n\n    void hello() {\n        System.out.println("Hello, " + this.this$0.name);\n    }\n}<\/code><\/pre>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u7f16\u8bd1\u5668\u4e3aInner\u7c7b\u751f\u6210\u4e86\u4e00\u4e2athis$0\u5b57\u6bb5\uff0c\u7528\u6765\u4fdd\u5b58\u5bf9\u5e94\u7684Ouer\u5b9e\u4f8b\u3002\u56e0\u6b64\uff0c<\/p>\n
Outer.this.name<\/code><\/pre>\n
\u672c\u8d28\u4e0a\u4f1a\u88ab\u7f16\u8bd1\u6210<\/p>\n
this$0.name<\/code><\/pre>\n
\u6240\u4ee5\u5728\u5185\u90e8\u7c7b\u4e2d\u76f4\u63a5\u8bbf\u95ee<\/p>\n
System.out.println(name);<\/code><\/pre>\n
\u7b49\u4ef7\u4e8e<\/p>\n
System.out.println(this$0.name)<\/code><\/pre>\n
\u4e5f\u5c31\u662f\u8bf4\uff0c\u5185\u90e8\u7c7b\u4e4b\u6240\u4ee5\u80fd\u591f\u76f4\u63a5\u8bbf\u95ee\u5916\u90e8\u7c7b\u6210\u5458\uff0c\u672c\u8d28\u4e0a\u662f\u56e0\u4e3a\u5b83\u6301\u6709\u4e00\u4e2a\u5916\u90e8\u7c7b\u5bf9\u8c61\u7684\u5f15\u7528\u3002<\/p>\n
\u533f\u540d\u5185\u90e8\u7c7b<\/h3>\n
\u533f\u540d\u5185\u90e8\u7c7b\u4e0d\u9700\u8981\u5728Outer calss\u4e2d\u660e\u786e\u5b9a\u4e49\uff0c\u800c\u662f\u5728\u65b9\u6cd5\u5185\u90e8\u5b9a\u4e49\u3002<\/p>\n
class Outer {\n    Outer(String name) {\n        this.name = name;\n    }\n\n    void asyncHello() {\n        Runnable r = new Runnable() {\n            @Override\n            public void run() {\n                System.out.println("Hello, " + Outer.this.name);\n            }\n        };\n\n        new Thread(r).start();\n    }\n}<\/code><\/pre>\n
\u89c2\u5bdfasyncHello()\u65b9\u6cd5\uff0c\u6211\u4eec\u5728\u65b9\u6cd5\u5185\u90e8\u5b9e\u4f8b\u5316\u4e86\u4e00\u4e2aRunnable\u3002
Runnable\u672c\u8eab\u662f\u63a5\u53e3\uff0c\u63a5\u53e3\u662f\u4e0d\u53ef\u4ee5\u88ab\u5b9e\u4f8b\u5316\u7684\u3002\u6240\u4ee5\u8fd9\u91cc\u662f\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5b9e\u73b0Runnable\u63a5\u53e3\u7684\u533f\u540d\u7c7b\uff0cnew Runnable() {}\u5b9e\u4f8b\u5316\u4e86\u5b9e\u73b0Runnable\u63a5\u53e3\u7684\u533f\u540d\u5185\u90e8\u7c7b\u5bf9\u8c61\uff0c\u7136\u540e\u5c06\u8be5\u5bf9\u8c61\u8f6c\u578b\u4e3aRunnable\u3002<\/p>\n
\u793a\u4f8b\u4ee3\u7801\u7b49\u4ef7\u4e8e<\/p>\n
class Xxx implements Runnable {\n    @Override\n    public void run() {\n        System.out.println("Hello, " + Outer.this.name);\n    }\n}\nRunnable r = new Xxx();<\/code><\/pre>\n
\u533f\u540d\u5185\u90e8\u7c7b\u6ca1\u6709\u7c7b\u540d\uff0c\u6240\u4ee5\u8fd9\u91cc\u7528Xxx\u3002<\/p>\n
\u53d1\u73b0\u5b9e\u9645\u4e0a\u88ab\u5b9e\u4f8b\u5316\u7684\u5bf9\u8c61\u7c7b\u578b\uff0c\u662f\u67d0\u4e2a\u533f\u540d\u7c7b<\/code>\uff0c\u5e76\u4e0d\u662fRunnable\u3002<\/p>\n
\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u8fc7\u7a0b\u4e2d\uff0cOuter\u7c7b\u88ab\u7f16\u8bd1\u4e3aOuter.class\uff0c\u800c\u533f\u540d\u7c7b\u88ab\u7f16\u8bd1\u4e3aOuter$1.class\u3002\u5982\u679c\u6709\u591a\u4e2a\u533f\u540d\u7c7b\uff0cJava\u7f16\u8bd1\u5668\u4f1a\u5c06\u6bcf\u4e2a\u533f\u540d\u7c7b\u4f9d\u6b21\u547d\u540d\u4e3aOuter$1\u3001Outer$2\u3001Outer$3\u2026\u2026<\/p>\n
\u672c\u8d28\u4e0a\u7c7b\u4f3c\u4e8e<\/p>\n
Outer$1 obj = new Outer$1();\nRunnable r = obj;<\/code><\/pre>\n
\u56e0\u4e3a<\/p>\n
Outer$1 implements Runnable<\/code><\/pre>\n
\u6240\u4ee5<\/p>\n
Outer$1 -> Runnable<\/code><\/pre>\n
\u662f\u4e00\u4e2a\u5411\u4e0a\u8f6c\u578b\uff0c\u5b50\u7c7b\u8f6c\u4e3a\u7236\u7c7b\u3002<\/p>\n
\u56de\u5f52\u95ee\u9898\uff0c\u4e3a\u4ec0\u4e48\u8981var that = this<\/h2>\n
\u7b80\u5316\u95ee\u9898\u4ee3\u7801\uff0c\u4ee5\u6b64\u4ee3\u7801\u4e3a\u4f8b\uff1a<\/p>\n
class OuterService {\n    private OuterRepository outerRepository;\n\n    void test() {\n\n        var that = this;\n\n        Runnable r = new Runnable() {\n            @Override\n            public void run() {\n                that.outerRepository.findAll();\n                System.out.println(this);\n                System.out.println(that);\n            }\n        };\n    }\n}<\/code><\/pre>\n
\u6211\u4eec\u5df2\u7ecf\u77e5\u9053\uff0c\u666e\u901a\u65b9\u6cd5\u4e2dthis\u6307\u5411\u7684\u662fOuterService\u5bf9\u8c61<\/code>\uff0c\u4f46\u662f\u8fdb\u5165\u533f\u540d\u5185\u90e8\u7c7b\u540e:<\/p>\n
new Runnable() {\n    @Override\n    public void run() {\n    }\n}<\/code><\/pre>\n
\u5df2\u7ecf\u4ea7\u751f\u4e86\u4e00\u4e2a\u65b0\u7684\u7c7b:<\/p>\n
OuterService$1<\/code><\/pre>\n
\u56e0\u6b64\uff0c\u6b64\u65f6\u7684this<\/code>\u4e0d\u518d\u6307\u5411OuterService<\/code>\uff0c\u800c\u662f\u6307\u5411OuterService$1<\/code>\uff0c\u5373\u533f\u540d\u5185\u90e8\u7c7b\u5bf9\u8c61\u672c\u8eab\u3002
\u6240\u4ee5\u5728\u533f\u540d\u5185\u90e8\u7c7b\u4e2d\u4f7f\u7528this\u65e0\u6cd5\u8bbf\u95ee\u5916\u90e8\u7c7b\u6210\u5458\uff0c\u624d\u9700\u8981<\/p>\n
var that = this;<\/code><\/pre>\n
\u63d0\u524d\u628a\u5916\u90e8\u7c7b\u7684this\u4fdd\u5b58\u4e0b\u6765\uff0c\u540e\u9762\u518d\u53bb\u8bbf\u95eethat.outerRepository()<\/code>\uff0c\u5b9e\u9645\u4e0a\u662f\u5728\u8bbf\u95ee\u5916\u90e8\u7684OuterService<\/code>\u5bf9\u8c61<\/p>\n
\u9664\u4e86\u4fdd\u7559this\u5173\u952e\u5b57\uff0c\u8fd8\u53ef\u4ee5\u8fd9\u79cd\u65b9\u5f0f\u8bbf\u95ee\u5916\u90e8\u5bf9\u8c61\uff1a<\/p>\n
OuterService.this.outerRepository()<\/code><\/pre>\n
\u4f7f\u7528var that = this<\/code>\u5e76\u4e0d\u662f\u201c\u5fc5\u987b\u201d\u7684\uff0c\u800c\u662f\u4e00\u79cd<\/p>\n