The second process of assessment

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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) 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

(3) Knowledge points:

Comprehensive application of classes and objects, subclasses and inheritance

(4) Code:

 1 import java.util.Scanner; 2 class student{3 string name; 4 String sex; 5 int age; 6 Private String Getnam E () {7 return name; 8} 9 private void SetName (String name) {this.name=name;11}12 private String ge Tsex () {name;14}15 private void Setsex (String Sex) {this.sex=sex;17}18 private int Getage () {age;20}21 private void setage (int age) {this.age=age;23}24 Student (String Name,strin G Sex,int age) {this.name=name;26 this.sex=sex;27 this.age=age;28}29}30 public class main{31 p Ublic static void Main (string[] args) {Scanner in = new Scanner (system.in); String n;34 Strin G s;35 int a;36 n=in.next (); Panax Notoginseng a=in.nextint (); S=in.next (); the Student Student=ne W Student (N,s,a); System.out.println ("Student [name= '" "+student.name+" ', sex= ' "+student.sex+" ', age= "+student.age + "]");}42} 
 

(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) 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

(3) Knowledge points:

Parameter Passing value

(4) Code:

1 Import Java.util.Scanner; 2 public class Main {3 publicly     static void main (string[] args) {4                 Scanner in = new Scanner (system.in); 5                 int A,b,c,d,e; 6                 a = In.nextint (); 7                 B = In.nextint (); 8                 C = In.nextint (); 9                 d = in.nextint ();                 e = In.nextint (); 11< C8/>RR rr = new RR (),                 double dd = rr.fun (a,b,c,d,e),                 System.out.printf ("%.2f", DD),     }15}16 class rr{  + Public     double Fun (double A, double b, double c,double d,double e) {double         x = (a+b+c+d+e)/5;19         return X;20     }21}

(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) Program design ideas:

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

(3) Knowledge points:

Method overloading, parameter passing value

(4) Code:

1 Import Java.util.Scanner; 2 public class main{3 public     static void Main (string[] args) {4         Scanner in = new Scanner (system.in); 5         int he ight, Width; 6         char status; 7         height = in.nextint (); 8         width = In.nextint (); 9         Board Board = new Board (height, width); 1 0         status = Board.getstatus ();         System.out.print (status)     ,}13}14 class board{15    int height, width ; public    Board (int height, int width) {        this.height = height;18        this.width = width;19    }20    Public Char getStatus () {        if (height<=width) {[           1];        }else{24          return status ( 1.0);        }26    }27 public    char status (double rate) {         n char x = ' B ';         return x;30    }31 Public    char status (int rate) {+         char x = ' A ';         return x;34    }35}

(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) Program design ideas:

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

(3) Knowledge points:

Inheritance of subclasses

(4) Code:

1 public class Main {2 public     static void Main (string[] args) {3         Animal Animal = new Dog (); 4         animal.shout () ; 5         Animal.run (); 6     } 7} 8  9 class Animal {Ten     void shout () {         System.out.println ("Animal shout! "),     }13     void Run () {     }16}17, class Dog extends Animal {     void shout () {         Super.shout ();         System.out.println ("Wangwang ...");     }23     void Run () {         System.out.println ("Dog is Running");     }27}

(5) Operation Result:

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The second process of assessment