使用java打印心型、圆形图案的实现代码

 /**
 *打印心形
 */
 public static void aiXin(){
   for(float y = (float) 1.5;y>-1.5;y -=0.1) { 
    for(float x= (float) -1.5;x<1.5;x+= 0.05){ 
     float a = x*x+y*y-1; 
     if((a*a*a-x*x*y*y*y)<=0.0) { 
       System.out.print("^"); 
     } 
     else 
       System.out.print(" "); 
    } 
    System.out.println(); 
  } 
 }

public static void circle(){
  int r=15;//圆形的半径
   for (int y = 0; y <= 2 * r; y += 2) {//y的步长为2,改变y的步长可以将圆形变成椭圆 
   int x = (int)Math.round(r - Math.sqrt(2 * r * y - y * y)); 
   int len = 2 * (r - x); 
   for (int i = 0; i <= x; i++) { 
    System.out.print(' '); 
   }
   System.out.print('*'); 
   for (int j = 0; j <= len; j++) { 
    System.out.print(' '); 
   } 
   System.out.println('*'); 
  } 
 }

 for (int j = 0; j <= len; j++) { 
    System.out.print('*'); 
  } 

publicclass Ch1_1
{
  public static void main(String[] args)
  {
    *********
    for(i = 1; i<= 5; i++)  //循环5次，打印5行
    ｛
      //打印若干空格
      //打印若干符号
    ｝
  ｝
｝

for(i =1; i<= n; i++)
{
  for(j = 1; j <= n – i; j++)  //根据外层行号，输出符号左边空格
    System.out.println(“ ”);
}

for(i =1; i<= n; i++)
{
  for(k = 1; j <= i * 2 -1; k++) //根据外层行号，输出符号数
    System.out.println(“*”);
}

importjava.util.Scanner;
publicclass Ch1_1
{
  public static void main(String[] args)
  {
    int i, j, k, n;
    Scanner input = new Scanner(System.in);
    System.out.print("请输入金字塔层数：");
    n = input.nextInt();
    //外层循环控制层数
    for(i = 1; i <= n; i++)
    {
      //根据外层行号，输出星号左边的空格
      for(j = 1; j <= n - i; j++)
       System.out.printf(" ");
      //根据外层行号，输出星号个数
      for(k = 1; k <= 2 * i -1; k++)
       System.out.print("*");
      //一行结束，换行
      System.out.print("\n");
    }
  }
}
/*
 *注：Java中的print、printf、println
*/

importjava.util.Scanner;
publicclass Ch1_1
{
  public static void main(String[] args)
  {
    int i, j, k, n;
    Scanner input = new Scanner(System.in);
    System.out.print("请输入倒金字塔层数：");
    n = input.nextInt();
    //外层循环控制层数
    for(i = 1; i <= n; i++)
    {
      //根据外层行号，输出星号左边的空格
      for(j = 1; j <= i - 1; j++)
       System.out.printf(" ");
      //根据外层行号，输出星号个数
      for(k = 1; k <= 2 * (n - i) -1;k++)
       System.out.print("*");
      //一行结束，换行
      System.out.print("\n");
    }
  }
}

importjava.util.Scanner;
publicclass Ch1_1
{
  public static void main(String[] args)
  {
    int i, j, k, n;
    Scanner input = new Scanner(System.in);
    System.out.print("请输入直角三角形层数：");
    n = input.nextInt();
    //外层循环控制层数
    for(i = 1; i <= n; i++)
    {
      //根据外层行号，输出星号个数
      for(k = 1; k <= n - i + 1; k++)
       System.out.print("*");
      //一行结束，换行
      System.out.print("\n");
    }
  }
}