1. Make up a program that contains the following content,
1) a round class (Circle), include:
Properties: circle radius radius; Constant PI,
Methods: the constructor; Calculating the area of area (); For generating circumference method (), 2) the main class (X4_3_1), include:
Main method main (), in the main method to create the circle and initializes the object of the class c1 and 2, cl, 2 the radius of the radius of 100 to 200, and then shows two circles of area and perimeter, respectively,

CodePudding user response:

Simple do ah

CodePudding user response:

 
Public class Circle {

Private int the radius; 

Public static final double PI=Math. PI; 

Public Circle radius, (int) {
Enclosing the radius=radius; 
} 

Public int getRadius () {
Return the radius. 
} 

Public void setRadius radius, (int) {
Enclosing the radius=radius; 
} 

Public double area () {
Radius, return PI * * radius; 
} 

Public double generating () {
Return 2 * PI * radius; 
} 

Public static void main (String [] args) {
Circle c1=new Circle (100); 
Circle the c2=new Circle (200); 
System. The out. Println (" is the area of the circle c1: "+ c1. Area ()); 
System. The out. Println (" is the circumference of the circle c1: "+ c1. Generating ()); 
System. The out. Println (" the area of the circle c2: "+ c2. Area ()); 
System. The out. Println (" is the circumference of the circle c2: "+ c2. Generating ()); 

} 

}