Java控制台画圆

画空心圆

完整代码：

//空心圆
import java.util.Scanner;  
class circle2   
{  public static void main(String[] args)   {  new circle2().print();}  //画圆函数void print() {System.out.println("输入半径：");  Scanner input=new Scanner(System.in);  int r=input.nextInt();System.out.println("输出：");  for(int y=0; y<=2*r;y+=2){  int x=(int)Math.round(r-Math.sqrt(r*r-(r-y)*(r-y)));int l=2*(r-x);  for(int i=0;i<=x;i++){  System.out.print(" ");  }  System.out.print("*");for(int i=0;i<=l;i++){  System.out.print("*");  }  System.out.println("");  }}  
}  

画实心圆

完整代码：

//实心圆
import java.util.Scanner;  
class circle   
{  public static void main(String[] args)   {  new circle().print();   }    //画圆函数void print() {System.out.println("输入半径：");  Scanner input=new Scanner(System.in);  int r=input.nextInt(); System.out.println("输出：");  for(int y=0; y<=2*r;y+=2){  int x=(int)Math.round(r-Math.sqrt(r*r-(r-y)*(r-y)));  int l=2*(r-x);  for(int i=0;i<=x;i++){  System.out.print(" ");  }  System.out.print(".");for(int i=0;i<=l;i++){  System.out.print("*");  }  System.out.println("*");  }}  
}