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Chapter 1 - Coggle Diagram

- - - - variable hold state
      - method operate state
        
        method name and parameter type
        
        method signature
  - - - //
    - - /**/
      - /**/*/ Not compile
    - - /****/
  - - - javac Zoo.java
        
        compile to .class
      - java Zoo
        
        execute byte code
      - java Zoo San Diego
        
        Args to main method
        
        "San Diego" an argument
  - - - cannot have two class
- - - - import java.util.*;
      - does not make slow program
    - - import java.nio.*;
      - import java.nio.*.*;
      - import java.nio.file.Paths.*;
    - - import java.util.Date;
        import java.sql.*;
        
        use Date of java.util
        
        use fully qualified name
    - - javac packagea/ClassA.java packageb/ClassB.java
      - same package use *.java
    - - javac -d target packagea/ClassA.java packageb/ClassB.java
        
        create class in target
        
        same structure
        
        target/packagea
        
        target/packageb
        
        three commands
        
        java -cp target packageb.ClassB
        
        java -classpath classes packageb.ClassB
        
        java --class-path classes packageb.ClassB
        
        -d directory to place classes
        
        javac -cp ...
    - - can import class only from jdk
  - - - create from current dir
      - short command
    - - long command
    - - -C option specifies dir
    - - -c
        --create
        
        new jar file
      - -v
        --verbose
        
        print details
      - -f
        --file
        
        jar filename
      - -C
        
        dir containing files
  - - - testing about PIC
    - - because after package
    - - verify correctly syntax
    - - if (list.isEmpty()) { System.out.println("e");
        } else { //code}
    - - line 1 must have imports
        
        only classes from other packages
- - - - functional programming too
      - mainly
    - - protect data
    - - write once run anywhere
    - - better manage memory
    - - run at the same time
    - - Deprecation annotation