https://olhub.org 2026-04-28T16:15:56.099Z weekly 1 https://olhub.org/learn/java 2026-04-27T16:08:55.338Z weekly 0.8 https://olhub.org/learn/java/01-nhap-mon-tu-duy-lap-trinh/01-java-la-gi 2026-04-23T10:04:33.000Z monthly 0.9 https://olhub.org/learn/java/01-nhap-mon-tu-duy-lap-trinh/02-jvm-jre-jdk 2026-04-23T10:04:33.000Z monthly 0.9 https://olhub.org/learn/java/01-nhap-mon-tu-duy-lap-trinh/03-cai-dat-moi-truong 2026-04-23T10:04:33.000Z monthly 0.9 https://olhub.org/learn/java/01-nhap-mon-tu-duy-lap-trinh/04-hello-world 2026-04-27T03:11:52.107Z monthly 0.9 https://olhub.org/learn/java/01-nhap-mon-tu-duy-lap-trinh/05-tu-duy-lap-trinh 2026-04-23T10:04:33.001Z monthly 0.9 https://olhub.org/learn/java/01-nhap-mon-tu-duy-lap-trinh/06-compile-va-run 2026-04-23T10:04:33.001Z monthly 0.9 https://olhub.org/learn/java/01-nhap-mon-tu-duy-lap-trinh/07-mini-challenge-lich-thang 2026-04-22T10:16:53.681Z monthly 0.9 https://olhub.org/learn/java/02-cu-phap-java-kieu-du-lieu/01-bien-va-khai-bao 2026-04-23T10:04:33.002Z monthly 0.9 https://olhub.org/learn/java/02-cu-phap-java-kieu-du-lieu/02-kieu-nguyen-thuy 2026-04-23T10:04:33.003Z monthly 0.9 https://olhub.org/learn/java/02-cu-phap-java-kieu-du-lieu/03-kieu-tham-chieu 2026-04-23T10:04:33.003Z monthly 0.9 https://olhub.org/learn/java/02-cu-phap-java-kieu-du-lieu/04-toan-tu 2026-04-23T10:04:33.003Z monthly 0.9 https://olhub.org/learn/java/02-cu-phap-java-kieu-du-lieu/05-ep-kieu 2026-04-23T10:04:33.004Z monthly 0.9 https://olhub.org/learn/java/02-cu-phap-java-kieu-du-lieu/06-string-text-block 2026-04-23T10:04:33.005Z monthly 0.9 https://olhub.org/learn/java/02-cu-phap-java-kieu-du-lieu/07-hang-so-enum-final 2026-04-23T10:04:33.005Z monthly 0.9 https://olhub.org/learn/java/02-cu-phap-java-kieu-du-lieu/08-mini-challenge-bmi 2026-04-22T10:16:53.686Z monthly 0.9 https://olhub.org/learn/java/03-dieu-kien-va-vong-lap/01-if-else 2026-04-23T10:04:33.006Z monthly 0.9 https://olhub.org/learn/java/03-dieu-kien-va-vong-lap/02-switch 2026-04-23T10:04:33.006Z monthly 0.9 https://olhub.org/learn/java/03-dieu-kien-va-vong-lap/03-while-do-while 2026-04-23T10:04:33.006Z monthly 0.9 https://olhub.org/learn/java/03-dieu-kien-va-vong-lap/04-vong-lap-for 2026-04-23T10:04:33.007Z monthly 0.9 https://olhub.org/learn/java/03-dieu-kien-va-vong-lap/05-for-each 2026-04-23T10:04:33.007Z monthly 0.9 https://olhub.org/learn/java/03-dieu-kien-va-vong-lap/06-break-continue 2026-04-23T10:04:33.007Z monthly 0.9 https://olhub.org/learn/java/03-dieu-kien-va-vong-lap/07-mini-challenge-fizzbuzz 2026-04-23T10:04:33.007Z monthly 0.9 https://olhub.org/learn/java/04-phuong-thuc/01-khai-bao-method 2026-04-23T10:04:33.008Z monthly 0.9 https://olhub.org/learn/java/04-phuong-thuc/02-overloading 2026-04-23T10:04:33.008Z monthly 0.9 https://olhub.org/learn/java/04-phuong-thuc/03-varargs 2026-04-23T10:04:33.009Z monthly 0.9 https://olhub.org/learn/java/04-phuong-thuc/04-recursion 2026-04-23T10:04:33.009Z monthly 0.9 https://olhub.org/learn/java/04-phuong-thuc/05-scope-shadowing 2026-04-23T10:04:33.010Z monthly 0.9 https://olhub.org/learn/java/04-phuong-thuc/06-mini-challenge-number-utils 2026-04-23T10:04:33.010Z monthly 0.9 https://olhub.org/learn/java/05-oop-co-ban/01-class-va-object 2026-04-23T10:04:33.010Z monthly 0.9 https://olhub.org/learn/java/05-oop-co-ban/02-constructor-va-this 2026-04-23T10:04:33.011Z monthly 0.9 https://olhub.org/learn/java/05-oop-co-ban/03-field-vs-local 2026-04-23T10:04:33.011Z monthly 0.9 https://olhub.org/learn/java/05-oop-co-ban/04-encapsulation 2026-04-23T10:04:33.012Z monthly 0.9 https://olhub.org/learn/java/05-oop-co-ban/05-toString-equals-hashcode 2026-04-23T10:04:33.012Z monthly 0.9 https://olhub.org/learn/java/05-oop-co-ban/06-record 2026-04-23T10:04:33.012Z monthly 0.9 https://olhub.org/learn/java/05-oop-co-ban/07-mini-challenge-library 2026-04-23T10:04:33.013Z monthly 0.9 https://olhub.org/learn/java/06-ke-thua-va-da-hinh/01-tu-duy-truu-tuong-hoa 2026-04-24T14:16:46.228Z monthly 0.9 https://olhub.org/learn/java/06-ke-thua-va-da-hinh/02-extends-super 2026-04-24T14:16:46.231Z monthly 0.9 https://olhub.org/learn/java/06-ke-thua-va-da-hinh/03-override-va-dynamic-dispatch 2026-04-24T14:16:46.231Z monthly 0.9 https://olhub.org/learn/java/06-ke-thua-va-da-hinh/04-abstract-class 2026-04-24T14:16:46.231Z monthly 0.9 https://olhub.org/learn/java/06-ke-thua-va-da-hinh/05-interface 2026-04-24T14:16:46.231Z monthly 0.9 https://olhub.org/learn/java/06-ke-thua-va-da-hinh/06-sealed-class 2026-04-24T14:16:46.231Z monthly 0.9 https://olhub.org/learn/java/06-ke-thua-va-da-hinh/07-composition-over-inheritance 2026-04-24T14:16:46.232Z monthly 0.9 https://olhub.org/learn/java/06-ke-thua-va-da-hinh/08-mini-challenge-zoo 2026-04-24T14:16:46.235Z monthly 0.9 https://olhub.org/learn/java/07-exception-handling/01-throw-va-catch 2026-04-24T14:16:46.236Z monthly 0.9 https://olhub.org/learn/java/07-exception-handling/02-stack-trace-va-cause-chain 2026-04-24T14:16:46.236Z monthly 0.9 https://olhub.org/learn/java/07-exception-handling/03-checked-vs-unchecked 2026-04-24T14:16:46.237Z monthly 0.9 https://olhub.org/learn/java/07-exception-handling/04-try-with-resources 2026-04-24T14:16:46.237Z monthly 0.9 https://olhub.org/learn/java/07-exception-handling/05-custom-exception 2026-04-24T14:16:46.237Z monthly 0.9 https://olhub.org/learn/java/07-exception-handling/06-mini-challenge-validator 2026-04-24T14:16:46.244Z monthly 0.9 https://olhub.org/learn/java/08-generics-va-collections/01-generics-co-ban 2026-04-23T10:04:33.019Z monthly 0.9 https://olhub.org/learn/java/08-generics-va-collections/02-type-erasure 2026-04-23T10:04:33.019Z monthly 0.9 https://olhub.org/learn/java/08-generics-va-collections/03-wildcard-va-pecs 2026-04-23T10:04:33.019Z monthly 0.9 https://olhub.org/learn/java/08-generics-va-collections/04-list-va-queue 2026-04-24T14:16:46.245Z monthly 0.9 https://olhub.org/learn/java/08-generics-va-collections/05-map-va-set 2026-04-24T14:16:46.245Z monthly 0.9 https://olhub.org/learn/java/08-generics-va-collections/06-mini-challenge-lru-cache 2026-04-24T14:16:46.246Z monthly 0.9 https://olhub.org/learn/java/09-stream-api-va-lambda/01-lambda-va-functional-interface 2026-04-24T14:16:46.251Z monthly 0.9 https://olhub.org/learn/java/09-stream-api-va-lambda/02-stream-basics 2026-04-24T14:16:46.251Z monthly 0.9 https://olhub.org/learn/java/09-stream-api-va-lambda/03-map-filter-reduce 2026-04-24T14:16:46.254Z monthly 0.9 https://olhub.org/learn/java/09-stream-api-va-lambda/04-stream-nang-cao 2026-04-24T14:16:46.255Z monthly 0.9 https://olhub.org/learn/java/09-stream-api-va-lambda/05-optional 2026-04-24T14:16:46.255Z monthly 0.9 https://olhub.org/learn/java/09-stream-api-va-lambda/06-mini-challenge-sales-report 2026-04-24T14:16:46.255Z monthly 0.9 https://olhub.org/learn/java/10-concurrency-co-ban/01-thread-co-ban 2026-04-24T14:16:46.256Z monthly 0.9 https://olhub.org/learn/java/10-concurrency-co-ban/02-synchronized-va-volatile 2026-04-24T14:16:46.256Z monthly 0.9 https://olhub.org/learn/java/10-concurrency-co-ban/03-executor-service 2026-04-24T14:16:46.257Z monthly 0.9 https://olhub.org/learn/java/10-concurrency-co-ban/04-concurrent-collections 2026-04-24T14:16:46.257Z monthly 0.9 https://olhub.org/learn/java/10-concurrency-co-ban/05-virtual-threads 2026-04-24T14:16:46.257Z monthly 0.9 https://olhub.org/learn/java/10-concurrency-co-ban/06-mini-challenge-web-scraper 2026-04-24T14:16:46.258Z monthly 0.9 https://olhub.org/learn/java/11-io-va-nio/01-stream-co-dien 2026-04-24T14:16:46.259Z monthly 0.9 https://olhub.org/learn/java/11-io-va-nio/02-nio-path-files 2026-04-24T14:16:46.259Z monthly 0.9 https://olhub.org/learn/java/11-io-va-nio/03-serialization 2026-04-24T14:16:46.260Z monthly 0.9 https://olhub.org/learn/java/11-io-va-nio/04-stream-on-files 2026-04-24T14:16:46.260Z monthly 0.9 https://olhub.org/learn/java/11-io-va-nio/05-mini-challenge-log-aggregator 2026-04-24T14:16:46.260Z monthly 0.9 https://olhub.org/learn/java/12-jvm-internals/01-class-loader 2026-04-27T16:08:55.335Z monthly 0.9 https://olhub.org/learn/java/12-jvm-internals/02-bytecode-javap 2026-04-27T16:08:55.337Z monthly 0.9 https://olhub.org/learn/java/12-jvm-internals/03-jit-tiered-compilation 2026-04-27T16:08:55.337Z monthly 0.9 https://olhub.org/learn/java/12-jvm-internals/04-memory-heap-metaspace 2026-04-27T16:08:55.337Z monthly 0.9 https://olhub.org/learn/java/12-jvm-internals/05-garbage-collection 2026-04-27T16:08:55.338Z monthly 0.9 https://olhub.org/learn/java/12-jvm-internals/06-jvm-tools-jfr 2026-04-27T16:08:55.338Z monthly 0.9 https://olhub.org/learn/java/12-jvm-internals/07-mini-challenge-debug-leak 2026-04-27T16:08:55.338Z monthly 0.9 https://olhub.org/learn/spring 2026-04-27T03:11:52.125Z weekly 0.8 https://olhub.org/learn/spring/_legacy/01-rest-api-voi-spring 2026-04-27T03:11:52.124Z monthly 0.9 https://olhub.org/learn/spring/01-spring-core/01-spring-la-gi 2026-04-27T03:11:52.108Z monthly 0.9 https://olhub.org/learn/spring/01-spring-core/02-ioc-va-di 2026-04-27T03:11:52.108Z monthly 0.9 https://olhub.org/learn/spring/01-spring-core/03-application-context 2026-04-27T03:11:52.108Z monthly 0.9 https://olhub.org/learn/spring/01-spring-core/04-bean-lifecycle 2026-04-27T03:11:52.109Z monthly 0.9 https://olhub.org/learn/spring/01-spring-core/05-bean-scopes 2026-04-27T03:11:52.109Z monthly 0.9 https://olhub.org/learn/spring/01-spring-core/06-configuration-bean-component 2026-04-27T03:11:52.109Z monthly 0.9 https://olhub.org/learn/spring/01-spring-core/07-mini-challenge-mini-ioc 2026-04-27T03:11:52.111Z monthly 0.9 https://olhub.org/learn/spring/02-spring-boot-foundations/01-spring-boot-giai-quyet-gi 2026-04-27T03:11:52.111Z monthly 0.9 https://olhub.org/learn/spring/02-spring-boot-foundations/02-starter-dependencies 2026-04-27T03:11:52.111Z monthly 0.9 https://olhub.org/learn/spring/02-spring-boot-foundations/03-auto-configuration-deep-dive 2026-04-27T03:11:52.112Z monthly 0.9 https://olhub.org/learn/spring/02-spring-boot-foundations/04-externalized-configuration 2026-04-27T03:11:52.112Z monthly 0.9 https://olhub.org/learn/spring/02-spring-boot-foundations/05-profiles 2026-04-27T03:11:52.112Z monthly 0.9 https://olhub.org/learn/spring/02-spring-boot-foundations/06-logging 2026-04-27T03:11:52.113Z monthly 0.9 https://olhub.org/learn/spring/02-spring-boot-foundations/07-mini-challenge-trace-request 2026-04-27T03:11:52.113Z monthly 0.9 https://olhub.org/learn/spring/03-rest-api-spring-mvc/01-dispatcher-servlet 2026-04-27T03:11:52.114Z monthly 0.9 https://olhub.org/learn/spring/03-rest-api-spring-mvc/02-restcontroller-mapping 2026-04-27T03:11:52.114Z monthly 0.9 https://olhub.org/learn/spring/03-rest-api-spring-mvc/03-request-binding 2026-04-27T03:11:52.115Z monthly 0.9 https://olhub.org/learn/spring/03-rest-api-spring-mvc/04-response-handling 2026-04-27T03:11:52.115Z monthly 0.9 https://olhub.org/learn/spring/03-rest-api-spring-mvc/05-exception-handling 2026-04-27T03:11:52.116Z monthly 0.9 https://olhub.org/learn/spring/03-rest-api-spring-mvc/06-validation 2026-04-27T03:11:52.116Z monthly 0.9 https://olhub.org/learn/spring/03-rest-api-spring-mvc/07-openapi-swagger 2026-04-27T03:11:52.116Z monthly 0.9 https://olhub.org/learn/spring/03-rest-api-spring-mvc/08-mini-challenge-taskflow-v1 2026-04-27T03:11:52.117Z monthly 0.9 https://olhub.org/learn/spring/04-spring-data-jpa/01-jpa-hibernate-orm 2026-04-27T03:11:52.117Z monthly 0.9 https://olhub.org/learn/spring/04-spring-data-jpa/02-entity-mapping 2026-04-27T03:11:52.118Z monthly 0.9 https://olhub.org/learn/spring/04-spring-data-jpa/03-repository-abstraction 2026-04-27T03:11:52.118Z monthly 0.9 https://olhub.org/learn/spring/04-spring-data-jpa/04-relationships 2026-04-27T03:11:52.119Z monthly 0.9 https://olhub.org/learn/spring/04-spring-data-jpa/05-transactions 2026-04-27T03:11:52.119Z monthly 0.9 https://olhub.org/learn/spring/04-spring-data-jpa/06-flyway-migration 2026-04-27T03:11:52.119Z monthly 0.9 https://olhub.org/learn/spring/04-spring-data-jpa/07-pagination-sorting 2026-04-27T03:11:52.120Z monthly 0.9 https://olhub.org/learn/spring/04-spring-data-jpa/08-mini-challenge-taskflow-v2 2026-04-27T03:11:52.120Z monthly 0.9 https://olhub.org/learn/spring/05-spring-security/01-security-architecture 2026-04-27T03:11:52.121Z monthly 0.9 https://olhub.org/learn/spring/05-spring-security/02-security-filter-chain-dsl 2026-04-27T03:11:52.122Z monthly 0.9 https://olhub.org/learn/spring/05-spring-security/03-form-login-basic-auth 2026-04-27T03:11:52.122Z monthly 0.9 https://olhub.org/learn/spring/05-spring-security/04-jwt-authentication 2026-04-27T03:11:52.122Z monthly 0.9 https://olhub.org/learn/spring/05-spring-security/05-method-security 2026-04-27T03:11:52.123Z monthly 0.9 https://olhub.org/learn/spring/05-spring-security/06-cors-csrf 2026-04-27T03:11:52.123Z monthly 0.9 https://olhub.org/learn/spring/05-spring-security/07-mini-challenge-taskflow-v3 2026-04-27T03:11:52.123Z monthly 0.9 https://olhub.org/learn/sql 2026-04-13T14:21:20.143Z weekly 0.8 https://olhub.org/learn/sql/01-sql-co-ban/01-select-co-ban 2026-04-13T14:21:20.139Z monthly 0.9 https://olhub.org/learn/sql/01-sql-co-ban/02-aggregation-va-grouping 2026-04-13T14:21:20.139Z monthly 0.9 https://olhub.org/learn/sql/02-sql-nang-cao/01-indexing 2026-04-13T14:21:20.141Z monthly 0.9 https://olhub.org/learn/sql/02-sql-nang-cao/02-subquery-va-cte 2026-04-13T14:21:20.141Z monthly 0.9 https://olhub.org/learn/sql/02-sql-nang-cao/03-transaction-va-acid 2026-04-13T14:21:20.142Z monthly 0.9 https://olhub.org/learn/thuat-toan 2026-04-13T14:21:20.146Z weekly 0.8 https://olhub.org/learn/thuat-toan/01-nen-tang/01-do-phuc-tap-thuat-toan 2026-04-13T14:21:20.143Z monthly 0.9 https://olhub.org/learn/thuat-toan/01-nen-tang/02-sorting-algorithms 2026-04-13T14:21:20.143Z monthly 0.9 https://olhub.org/learn/thuat-toan/02-ctdl-va-tim-kiem/01-binary-search 2026-04-13T14:21:20.144Z monthly 0.9 https://olhub.org/learn/thuat-toan/02-ctdl-va-tim-kiem/02-dynamic-programming 2026-04-13T14:21:20.145Z monthly 0.9 https://olhub.org/learn/thuat-toan/02-ctdl-va-tim-kiem/03-stack-va-queue 2026-04-13T14:21:20.145Z monthly 0.9