20194649 access, use objects

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.

juxing.java

1. Define three variables member
2. The establishment and access modifier
calculates a rectangular area 3. constructor

Package Qi; 

public  class Juxing { // define a rectangular type 
    static  Double length ;; // create a member long 
    static  Double Kuan; // Create member width 
    Double Area; 
    
    public  static  Double getLength () { // long rectangle accessor 
        return length ; 
    } 

    public  static  void the setLength ( Double length) { // long rectangle modifier 
        juxing.length = length; 
    } 

    public  static  Double getKuan () { //The width of the rectangle accessor 
        return Kuan; 
    } 

    public  static  void setKuan ( Double Kuan) { // rectangle width modifier 
        juxing.kuan = Kuan; 
    } 

    Double the getArea ( Double length, Double Kuan) { // There constructor parameter 
        area = * length Kuan;
         return area; // return a rectangular area 
    } 
}

R.java

1 . Create a rectangle, and generating a high volume of access and mutators
2.R construction method, the constructor seeking cylinder volume change method bottom area

Package Qi; 

public  class R & lt { // define quadrangular prism type 
        Double High; 
        Juxing A; // rectangle 
        Double V;
         public  Double gethigh () { // member variable is accessed and modified 
            return High; 
        } 
        public  void setHigh ( Double High) {
             the this .high = High; 
        } 
    
        public  Double getv () { // volume accessor 
            return V; 
        } 
        public  void SETV ( DoubleV) { // volume of the modifier 
            the this .v = V; 
        } 
        R & lt ( Double Area, Double High) { // There constructor parameters 
            the this .high = High; 
            
        } 
        
        Double getv () {
             return High * a.getArea (A .length, a.kuan); 
        } 
        public  Double Huangdi () { // huandi soled class 
            Double xD * = a.length a.kuan;
             return xD; // return a new bottom 
        } 
    }

APP.java

1. keyboard
2. Create a rectangular cylinder b and the object
3. The output volume of the original
4. The new output volume

Package Qi; 

Import java.util.Scanner; 


public  class the APP { 

    public  static  void main (String [] args) { 
        Scanner INPUT = new new Scanner (the System.in); 
        System.out.println ( "Please enter the length and breadth" ) ; 
        Juxing A = new new Juxing (); // create a rectangle object 
        a.length input.nextDouble = (); // input rectangle long 
        a.kuan input.nextDouble = (); // input rectangle width 
        Double High = input.nextDouble (); 
        R & lt B = new newR & lt (a.getArea (a.length, a.kuan), High);
         // Create object and call the quadrangular prism and the quadrangular prism rectangular area high 
        System.out.println ( "volume" + a.getArea (a .length, a.kuan) * High);
         // output column volume 
        System.out.println ( "Please enter a new length and width" ); 
        a.length = input.nextDouble (); // call the new rectangle long 
        a.kuan input.nextDouble = (); // call to the new width of the rectangle 
        System.out.println ( "new volume" + b.huangdi () * High);
         // call the new substrate, and output a new column volume 
        
        
    } 

}

 Test Run

 

Topic 2:

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.

MyInteger.java

1. Create a member variable value, build objects DX
2. access and modify the generated objects and member variable
3. isEven constructor () determines whether the value is an even number
4. JS constructor () determines whether the value is an odd number
5. ISODD constructor () determines whether the value is a prime number

Package Qi; 

public  class MyInteger {
     int value; 
    MyInteger DX; // Create Object DX 
    
    public MyInteger getDx () { // DX accessor 
        return DX; 
    } 

    public  void setDx (MyInteger DX) { // DX modifier of 
        the this . = DX DX; 
    } 


    public  int getVslue () { // value accessor 
        return value; 
    } 

    public  void setVslue ( int vslue) { // value accessors 
        the this .Value =vslue; 
        
    } 
    public  Boolean   isEven () { // determines whether an even 
    
        IF (value% 2 == 0 ) {
             return  to true ; 
        } 
        return  to false ; 
    } 
    public  Boolean JS () { // create a method of determining whether an odd 
            IF (value !% 2 = 0 )
                 return  to true ;
             the else 
                return   to false ; 
    } 
        
    public  Boolean isOdd (MyInteger I) { // determines whether or not a prime number 
            for ( int K = 2; K <i.value; K ++){
                
                        if (i.value % k== 0) {
                            return false;
            }
        }
            return true;
    }

    
    }
    

Test.java

Call MyInteger class method after creating objects dx

Package Qi; 

Import java.util.Scanner; 

public  class text { 

    public  static  void main (String [] args) { 
         Scanner imput = new new Scanner (the System.in); 
            System.out.println ( "Enter a number:"); //   prompted to enter the number of 
            MyInteger N2 = new new MyInteger ();   // Create Object 
            n2.value = imput.nextInt (); 
            System.out.println ( "the number is odd:" + n2.js ());  
             / / invoke method of determining whether an odd 
            System.out.println ( "the number is an even number:" + n2.isEven ()); 
            // call the method determines whether an even number 
            System.out.println ( "the number is a prime number:" + n2.isOdd (N2));
             // call the method determines whether or not a prime number 
             
             
    } 

}

Test Run