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Maven Understand Maven POM (project object model) artifactId: used for the name of the program. groupId: ? packaging: java-jar, cpp-? version: groupId 阅读全文
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ToDoList: Detached HEAD state. Other tools: git-completion.bash . -- git-prompt.sh -- This script allows you to see repository status in your prompt: 阅读全文
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Priority queue Priority queue represented as a balanced binary heap: the two children of queue[n] are queue[2*n+1] and queue[2*(n+1)]. The priority qu 阅读全文
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Comparable vs Comparator in Java Java provides two interfaces to sort objects using data members of the class: Comparable Comparator Using Comparable 阅读全文
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What is the difference between List<? super T> and List<? extends T> ? extends The wildcard declaration of List<? extends Number> foo3 means that any 阅读全文
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prereq: docker is ready and on. chen@Chen-System:~$ psql -U postgres -h localhost -p 54321Password for user postgres: psql (10.5 (Ubuntu 10.5-0ubuntu0 阅读全文
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https://docs.docker.com/install/linux/docker-ce/ubuntu/ https://docs.docker.com/install/linux/linux-postinstall/#manage-docker-as-a-non-root-user Issu 阅读全文
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Step 1 – Install Oracle Java 8 on Ubuntu Run below commands to install Java 8 on Ubuntu: Step 2 – Verify Java Inatallation The apt repository also pro 阅读全文