JAVAOO1-4 chapter learning focus

Data types in JAVA: basic types, reference types Basic types: numeric, byte, integer, long integer, character, Boolean, etc.; Reference type: class, interface, array; Notes on using identifiers: 1. Cannot start with a number 2. Case sensitive 3. Cannot quote keywords 4. CamelCase (first letter capitalized) 5. Pascal’s nomenclature (first letter primary, other words capitalized) Application of π π : final data type constant name (all uppercase) = constant value Input in java Header file: import java.util.Scanner public{ Scanner input (nameable) = new Scanner(System.in) Input: System.out.println(“Please enter: “); int (data type) num (optional name) = input.nextInt() input.nextInt();(receive shaping input) input.nextDouble();(receive Double type input) input.next();(receive string type input) } The minimum value of an integer in java: Integer.MIN_VALUE; (the green part must be capitalized) Random numbers in java: (int)(Math.random()*100); String comparisons in java are equal: Example: if(“name”.equals(variable name)) Fully qualified name:package name.package name.class name.fully qualified name The package name must be the first executable statement in the source file Important words: public public protected protected private private Method: public String toString(){ return “name”+name+”sex” +sex + “age” + age } Access modifier return value type method name (parameter list){ Method body: function code block to be implemented } Create object: Example: Create a…