Java.work7 access objects using operations 20,194,651

Topic 1:

　　5 on the basis of the job, and then creating a column type, comprising a rectangle, and the high volume of the three member variables, a constructor method to initialize member variables, and calculating the volume change method bottom two functions, in the main category input length, width, height, calculated cylinder volume, enter a new length, width, height, creating a new rectangle, the method using soled soled, the cylinder volume is calculated again.

Code:

1、App.java

1  / * 
2  * main class, the method comprising a master;
 3  * output volume, call rectangle modifiers soled, volume after soled;
 . 4   * / 
. 5  public  class the App {
 . 6      public  static  void main (String [ ] args) {
 . 7          Qua Qua = new new Qua (6, new new Rec (3,4- ));
 . 8          / * 
. 9           * Create square pillar and a bottom length and width of the object and high quadrangular prism assignment (length width 3 4 6 high )
 10           * / 
. 11          System.out.println ( "volume rectangular prism is:" + qua.get_V ());
 12 is          qua.setr ( new new Rec (5,2 ));
 13 is         System.out.print ( "Volume after soled quadrangular prism is:" + qua.get_V ());
 14      }
 15  
16 }

2、Rec.java

1  / * 
2  * rectangular type, comprising two member variables, two methods;
 3  * member variables a, b respectively represent the length and width of the rectangle;
 4  * constructor method is used to modify the value of a member variable, get_area rectangular area calculated ;
 . 5   * / 
. 6  public  class Rec {
 . 7  
. 8      Double A;
 . 9      Double B;
 10      Rec ( Double A, Double B) {
 . 11          the this II.A = A;
 12 is          the this .B = B;
 13 is      }
 14      public  Double get_area () {
 15          // calculate area 
16          return  a*b;
17     }
18 }

3, Qua.java

1  / *  
2  * cartridge type, comprising three member variables, three methods;
 3  * a bottom member variable r, h is high, v is volume;
 4  * constructor method to modify a member variable, r modifier commutation bottom, ger_V cylinder volume calculation;
 . 5   * / 
. 6  public  class Qua {
 . 7      // rectangle, the bottom of the cylinder 
. 8      Rec R & lt; 
 . 9      Double H;
 10      Double V;
 . 11      Qua ( Double H, R & lt Rec) {
 12 is          / / constructor 
13 is          the this .h = H;
 14          the this .r = R & lt;
 15      }
 16      public  voidSETR (R & lt Rec) {
 . 17          // modifier 
18 is          the this .r = R & lt;
 . 19      }
 20 is      public  Double get_V () {
 21 is          // calculated volume of the cylinder 
22 is          return r.get_area () * H;
 23 is      }
 24 }

operation result:

 

 

 

Topic two:

　　MyInteger design class name, which includes: int type value a data field construction method, when the specified int value, object data created MyInteger field value and the access modifier isEven () and isOdd () method, if the current object is even or odd, class method returns true isPrime (MyInteger i), determines whether the specified value is a prime number, returns true MyInteger create objects in the main class, each class MyInteger verification method.

Code:

1、Test.java

1  / * 
2  * main class, testing and validation methods MyInteger each class
 . 3   * / 
. 4  Package cn.edu.ccut.object1;
 . 5  
. 6  public  class the Test {
 . 7  
. 8      public  static  void main (String [] args) {
 . 9          obj = MyInteger new new MyInteger (. 6); // Create Object         
10          System.out.println ( "" + obj.getvalue () + "if an odd number:" + obj.isOdd ());
 . 11          System.out.println ( "" + obj.getvalue () + "is an even number:" + obj.isEven ());
 12 is          System.out.println ( "" + obj.getvalue () + "is prime:" +MyInteger.isPrime (obj));
 13 is          obj.setvalue (. 11); // with modification value to modify the value of 
14          System.out.println ( "" + obj.getvalue () + "if an odd number:" + obj. isOdd ());
 15          System.out.println ( "" + obj.getvalue () + "is an even number:" + obj.isEven ());
 16          System.out.println ( "" + obj.getvalue () + "is prime:" + MyInteger.isPrime (obj));
 . 17      }
 18 is }

2、MyInteger.java

. 1  / ** 
2  * MyInteger class contains a member variable value, six methods;
 3  data variable * value storing input member;
 4  * constructor initialization, value and the access modifier, isEven determines whether an even number, isOdd Analyzing whether it is an odd number, isPrime determines whether a prime number;
 . 5   * / 
. 6  Package cn.edu.ccut.object1;
 . 7  
. 8  public  class MyInteger {
 . 9       static  int value;
 10      
. 11      MyInteger ( int value) { // constructor 
12 is          MyInteger.value = value; 
 13 is      }
 14      
15      public  int   getValue () { //Accessor 
16          return value;
 . 17      }
 18 is      
. 19      public  void setValue ( int value) { // modifier 
20 is          = MyInteger.value value;
 21 is      }
 22 is      
23 is      public  Boolean isEven () { // determines whether an even number 
24          IF (value% 0 == 2 ) {
 25              return  to true ;
 26 is          }
 27          the else 
28              return  to false ;
 29      }
 30      
31 is      public Boolean isOdd () { // determines whether an odd 
32          IF (value% 2 == 0 ) {
 33 is              return  to false ;
 34 is          }
 35          the else 
36              return  to true ;
 37 [      }
 38 is      
39      public  static  Boolean the isPrime (MyInteger I) { // Analyzing is prime 
40          int J;
 41 is          for (J = 2; J <value / 2; J ++ ) {
 42 is              iF (% value J == 0 ) {
 43 is                  return  to false ;
 44 is              }
45         }
46         return true;
47     }
48 }

operation result: