The second process of assessment

Code Cloud Warehouse: https://gitee.com/yyh1234/codes/294l35yma06upt81bsrx763

7-1 Student Class-constructors

(1) Title:

Defines a student class for students, containing class member variables: string name, string sex, int age, and all variables must be private.

(2) Code:

1 ImportJava.util.Scanner;2 classstudent{3 String name;4 String sex;5   intAge ;6   PrivateString GetName () {7       returnname;8   }9   Private voidsetName (String name) {Ten        This. name=name; One   } A   PrivateString Getsex () { -       returnname; -   } the   Private voidsetsex (String Sex) { -        This. sex=sex; -   } -   Private intGetage () { +       returnAge ; -   } +   Private voidSetage (intAge ) { A        This. age=Age ; at   } -Student (String name,string sex,intAge ) { -        This. name=name; -        This. sex=sex; -        This. age=Age ; -   } in } -  Public classmain{ to      Public Static voidMain (string[] args) { +Scanner in =NewScanner (system.in); - String N; the String S; *         intA; $n=In.next ();Panax NotoginsengA=in.nextint (); -s=In.next (); theStudent student=NewStudent (n,s,a); +System.out.println ("Student [name= '" "+student.name+" ', sex= ' "+student.sex+" ', age= "+student.age+"] "); A     } the}

(3) Program design ideas:

Define the student class first, then privatize the 3 variables with private definition, and use this.xxx=xxx to establish the constructor, finally define the main class main, inside the external private variables to call, the last input and output

(4) Knowledge points:

Comprehensive application of classes and objects, subclasses and inheritance

(5) Operation Result:

7-2 Defining classes

(1) Title:

Please add the following code to complete the output requirements. (Note: Complete code is required)

(2) Code:

1 ImportJava.util.Scanner;2  Public classMain {3      Public Static voidMain (string[] args) {4Scanner in =NewScanner (system.in);5                 inta,b,c,d,e;6A =in.nextint ();7b =in.nextint ();8c =in.nextint ();9D =in.nextint ();TenE =in.nextint (); OneRR rr =NewRR (); A                 DoubleDD =Rr.fun (a,b,c,d,e); -System.out.printf ("%.2f", DD); -     } the } - classrr{ -      Public DoubleFun (DoubleADoubleBDoubleCDoubleDDoublee) { -         Doublex = (a+b+c+d+e)/5; +         returnx; -     } +}

(3) Program design ideas:

Add directly to the RR class, define a,b,c,d,e with a double, then define a total x, assign the value of the ABCDE to X and return it with a return and output

(4) Knowledge points:

Parameter Passing value

(5) Operation Result:

7-3 Horizontal Flat Vertical

(1) Title:

Procedural blanks. Refine the code below as required by the topic. Please submit the full code. If the height of a block is larger than the width, we say it is upright, otherwise we say it is flat. Read into the height and width of a block of wood. If it is flat, then output a, otherwise output B.

(2) Code:

1 ImportJava.util.Scanner;2  Public classmain{3      Public Static voidMain (string[] args) {4Scanner in =NewScanner (system.in);5         intheight, width;6         Charstatus;7Height =in.nextint ();8width =in.nextint ();9Board Board =NewBoard (height, width);TenStatus =board.getstatus (); One System.out.print (status); A     } - } - classboard{ the    intheight, width; -     PublicBoard (intHeightintwidth) { -         This. Height =height; -         This. width =width; +    } -     Public CharGetStatus () { +        if(height<=width) { A           returnStatus (1); at}Else{ -          returnStatus (1.0); -        } -    } -     Public CharStatusDoubleRate ) { -         Charx = ' B '; in         returnx; -    } to     Public CharStatusintRate ) { +         Charx = ' A '; -         returnx; the    } *}

(3) Program design ideas:

Assign the characters B and a to the Char X, and return the

(4) Knowledge points:

Method overloading, parameter passing value

(5) Operation Result:

7-4 program Change the wrong question 2

(1) Title: Procedure change the wrong question. There is an error in the following code, please submit it after modification.

(2) Code:

1  Public classMain {2      Public Static voidMain (string[] args) {3Animal Animal =NewDog ();4 animal.shout ();5 Animal.run ();6     }7 }8 9 classAnimal {Ten     voidshout () { OneSystem.out.println ("Animal shout! "); A     } -     voidrun () { -        the     } - } -  - classDogextendsAnimal { +     voidshout () { -         Super. Shout (); +System.out.println ("Wangwang ..."); A     } at  -     voidrun () { -System.out.println ("Dog is running"); -     } -}

(3) Program design ideas:

The class animal has void shout but no void run, which can be supplemented

(4) Knowledge points:

Inheritance of subclasses

(5) Operation Result:

Content	Number of lines of code	Blog
Classes and objects, subclasses and inheritance	125	320

The second process of assessment