Implementation:

• Implement a priorityBlockingQueue
• Implement comparator()
• Implement an iterator
• Implement a buffer (add(), read())
• Implement a hashmap
• Implement a queue
• Implement a stack

Java foundamental & Sytax:

• comparator
• Array length? -- nums.length
• List length? -- list.size();
• String length? -- str.length()
• How to return an array? -- return new int[] {1, 2};
• Integer.MAX_VALUE == 2147483647
• Integer.MIN_VALUE == -2147483648
• java 8
• conccurrency

Algo & Data Structure

System Design

Java Fundamental

Java Class Implementation:

Tools & Technology & Network Knowledge