学习网课补基础+刷leetcode打卡记录

glayin 发表于 2020-3-5 23:18
刚刚看完L1&L2路过，YouTube真的好卡，缓冲的时间比视频的时间都要长。小菜鸡目前还0ad，还是学点啥缓解日 ...

加油加油！我也是一边学一边等offer

【3.6打卡】
学习进度：L9
笔记要点：

• Abstract classes
  

          a.A class whose sole purpose is to be extended
          b.Abstract method lacks an implementation
          c.A non-abstract class may never
                contain an abstract method
                Inherit one without providing an implementation
          d.An abstract class lets you define an interface
                For multiple classes to share
                Without defining any of them yet

• Java Interface
  

               Interface: public fields method prototypes and behaviors
               Java interface: “interface keyword”
               2 differences between Java Interface and abstract class:
                   1.A class can inherit from only one class, but can implement (inherit from) many Java interfaces
                   2.A Java interface cannot
                           (1)implement any methods
                           (2)Include any field except “final static constants”

• Java Packages
  

               Package: collection of classes, Java interfaces & sub packages that trust each other
               3 benefits:
                     1.Packages can contain hidden classes not visible outside packages
                     2.Classes can have fields & methods visible inside packages only
                     3.Different packages can have classes with same name
每日叨叨：
L9和L10都是1h40min的时长，所以今天只学了L9，明天继续L10

【3.7打卡】
学习进度：回顾整理L1-9的笔记每日叨叨：
周末要准备面试，于是决定以回顾笔记为主，周一再继续往后学

JIAYOUJIAYOUJIAYOU

【3.8打卡】
学习进度: CS 61B L10
笔记要点：

• Exception:
  

      Purpose1: Coping with Errors
      Purpose2: Escaping a sinking ship

• Checked and unchecked Throwables
  

       When a method calls a method that can throw a checked exception

                  It can catch the exception or
                  It throws same exception itself

• The finally keyword
  

• If try statement begins, the finally clause will execute at the end, no matter what
• If statement X causes no exception, finally clause executed, 1 returned
• If statement x causes IOException, catch clause executed, then finally clause, 2 returned
• If statement X causes some other exception, finally clause executes, then exception continues down the stack
• Exception thrown in “catch” clause: terminate the “catch” clause; execute finally, exception continues down stack
• Exception thrown in “finally” clause: replaces old exception, “finally” clause & method end
  

• Final methods & classes
  

• Final method -> cannot be overridden
• Final class -> cannot be extended
  

【3.9打卡】
学习进度：L10
笔记要点：
Game Tree
Each grid is assigned a numerical score that indicates how optimistic we are about winning
1: computer wins
-1: opponent wins
0: perfect players will draw
No empty squares, nobody has won: 0

【3.10打卡】
学习进度：CS 61B L12&L13&L14
笔记要点：

• Encapsulation
• Table of important functions
  

• Hash codes
  

• Good examples:
  

   2. Bad examples:

【3.11打卡】
学习进度：CS 61B L15&L16
笔记要点：

• Big O
  

• Big θ
  

• Preorder traversal: visit node before recursively visiting its children, left to right. Root visited first
• Postorder traversal: recursively visit each node's children (left->right) before the node itself
• Binary trees have inorder traversal: recursively traverse root's ledt subtree, then root, then right subtree
  

楼主加油💪!!!!!!!!!

【3.12打卡】
学习进度：L24-25
每日叨叨：
中间因为耽误了几天进度落下了几节课，这两天在跟进度的同时也快速过了一下中间的，都是之前学过的二叉树/图论的内容，所以打算之后刷题的时候碰到了再针对性地看。
感觉不能单看网课，还是得多多练习，这样理解更透彻一些。
第一阶段的学习网课计划暂告一段落，这几天会停一下，之后开始刷题了再开一个帖子。
谢谢留言的朋友们的鼓励~一起加油