20165201 2017-2018-2 "Java Programming" 6th Week study Summary

Tag: Parameter log RTP class program to get the console position call

20165201 2017-2018-2 "Java Program Design" 6th Week study summary textbook Study content summary eighth chapter

StringClass can effectively handle character sequence information, and its common methods are:

• public int length()You can count the String length of a character sequence for an object
  For example:

    String a = "rocedu";    int n1,n2;    n1 = a.length();    n2 = "dsgdsdbs".length();

• public boolean equals(String s)You can compare String whether the current object's character sequence is the same as the character sequence of the object specified by the parameter s String
  
• public boolean startsWith(String s)And
  public boolean endsWith(String s)The former determines whether the character sequence prefix of the current String object is the character sequence of the object s specified by the parameter String , which determines whether the character sequence suffix of an String object is String the character sequence of the object s.
  
• public int compareTo(String s)The size of the String character sequence of the object s specified by the dictionary order and parameter
  
• public boolean contains(String s)Determines String whether the character sequence of the current object contains the character sequence of the parameter s
  
• public int indexOf(String s)And the public int lastIndexOf(String s) former retrieves the position of the String first occurrence of the character sequence starting at the 0 index position of the current object's character sequence, str and returns that position, which retrieves the position of the String last occurrence str of the character sequence starting at the 0 index position of the current object's character sequence. and return to that location
  
• public String substrings(int startpoint)You can get a new object, the character sequence of the new object is the character sequence that String String copies the String position in the character sequence of the current object startpoint to the last position of the character
  
• public String trim()You can get a new object, and the character sequence of the new object is the character sequence of the String String current String object's character sequence minus the front and back spaces
• StringTokenizerThe class does not differentiate between identifiers, numbers, and quoted strings, and they do not recognize and skip annotations. Can be specified at creation time, as well as by specifying delimiters for each tag

• StringBufferClasses and String classes: String The value can not be changed, the value as long as the change will become a new object, but StringBuffer it is convenient to delete and change the contents of the string without changing the object!

In addition, there are:

• DateClass
  
• CalenderClass
  
• MathClass
  
• BigIntegerClass
  
• RandomClass
  
• ClassClass
  
• ConsoleClass
  
• PatternClass
  
• MatcherClass

15th Chapter

• Generic class declaration: You can declare a class by using the class name < generic list >, for example:class People<E>
  
• Linked list: LinkedList<E> generic class;
  sorting and finding;
  Shuffle and rotate
  
• Stack: Be sure to be advanced after out!
• Hash map
• Tree Set
• Tree mapping
• Automatic box packing and unpacking

Code Hosting

Last week's summary of the wrong quiz

Parsing: B: A subclass can have only one parent class, but a parent class may have more than one child class

Parsing: The A:abstract keyword cannot be applied to static, private, or final methods. E: cannot have method body

Parse: A: It should be dashed. C: The interface cannot invoke other non-interface methods in the class

Learning progress Bar

	lines of code (new/cumulative)	Blog Volume (Add/accumulate)	Learning Time (new/cumulative)	Important Growth
Goal	6000 rows	30 Articles	400 hours
First week	23/23	1/5	18/18
Second week	367/390	2/7	16/34
Third week	672/1062	1/8	23/57
Week Four	724/1786	2/10	20/77
Week Five	1084/2870	1/11	15/92
Week Six	1187/4057	1/12	18/110

Resources

• Use the Code cloud and blog Park to learn a simple tutorial

20165201 2017-2018-2 "Java Programming" 6th Week study Summary