https://olhub.org 2026-04-24T14:32:49.322Z weekly 1 https://olhub.org/learn/java 2026-04-24T14:16:46.260Z 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 2026-04-23T10:04:33.001Z 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/spring 2026-04-13T14:21:20.138Z weekly 0.8 https://olhub.org/learn/spring/01-spring-core/01-spring-la-gi 2026-04-13T14:21:20.123Z monthly 0.9 https://olhub.org/learn/spring/01-spring-core/02-rest-api-voi-spring 2026-04-13T14:21:20.125Z monthly 0.9 https://olhub.org/learn/spring/02-data-va-security/01-spring-data-jpa 2026-04-13T14:21:20.127Z monthly 0.9 https://olhub.org/learn/spring/02-data-va-security/02-spring-security 2026-04-13T14:21:20.127Z monthly 0.9 https://olhub.org/learn/spring/03-testing-va-deploy/01-spring-boot-testing 2026-04-13T14:21:20.138Z monthly 0.9 https://olhub.org/learn/spring/03-testing-va-deploy/02-deploy-spring-boot 2026-04-13T14:21:20.138Z 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