Have a cup of Java!

Coding examples of basic functions in Java.

Inside each folder, a simple Java code is provided at path: xxx/src/xxx/Xxx.java.

For example, file "./methods/src/methods/Methods.java" provides a simple example of how to use methods in class-oriented programming.

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• Hello
• Create variable
• Convert data type
• Condition: if else
• Condition: while
• Array
• Hash Table
  • Run TestHashTable.java and enjoy!
• Java.lang package
  • Integer, Character, String

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• Graph
  • DFS
  

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• Search
  • The Binary Search

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• Sort

  • The Selection Sort
  • How to Use 'Debug' mode in Eclipse
  

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• Learn 'Class' with a ticket machine

TicketMachine

• Learn to use Class and Methods.

TicketMachine2

• Learn field/member variable
• Learn local variable
• Learn constructor
• Learn reference variable 'this'
• Learn constructor overloading
• Learn Constructor Caller

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• Learn to use package with a clock

  • Use object as member variable
  • Import packages
  • System.out.printf (also see ref1, ref2)
  • toString()
  

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• Learn Inheritance with a CD/DVD database

  • Learn polymorphism
  • Learn upcasting and downcasting
  

Recommended Java IDE: Eclipse

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Reference:

1. https://study.163.com/course/courseMain.htm?courseId=533006
2. https://study.163.com/course/courseMain.htm?courseId=1006190095
3. The image of ticket machine is from https://www.artstation.com/artwork/6lK86.
4. https://beginnersbook.com/2013/05/constructor-overloading/
5. https://www.geeksforgeeks.org