Java 打印金字塔星形图案程序

编写一个Java程序，使用for循环打印金字塔星形图案。此示例使用两个嵌套的for循环来迭代行和显示星形。

package ShapePrograms;

import java.util.Scanner;

public class PyramidPattern1 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Pyramid Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("--- Printing Pyramid Pattern of Stars ---");
		
		for (int i = 1 ; i <= rows; i++ ) 
		{
			for (int j = 0 ; j < rows - i; j++ ) 
			{
				System.out.print(" ");
			}
			for (int k = 0 ; k < (i * 2) - 1; k++ ) 
			{
				System.out.print("*");
			}
			System.out.println();
		}
	}
}

在此金字塔星形图案程序中，我们将for循环替换为while循环。

package ShapePrograms;

import java.util.Scanner;

public class PyramidPattern2 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Pyramid Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("--------");
		int i = 1 ;
		while( i <= rows) 
		{
			int j = 0 ; 
			while(j < rows - i ) 
			{
				System.out.print(" ");
				j++;
			}
			int k = 0 ; 
			while(k < (i * 2) - 1) 
			{
				System.out.print("*");
				k++;
			}
			System.out.println();
			i++;
		}
	}
}

Please Enter Pyramid Pattern Rows = 9
--------
        *
       ***
      *****
     *******
    *********
   ***********
  *************
 ***************
*****************

下面显示的程序使用do-while循环打印金字塔星形图案。

package ShapePrograms;

import java.util.Scanner;

public class PyramidPattern3 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Pyramid Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("--------");
		int j, k, i = 1;
		do 
		{
			j = 0; 
			do 
			{
				System.out.print(" ");
			}while(j++ < rows - i );
			k = 0; 
			do
			{
				System.out.print("*");
			}while(++k < (i * 2) - 1);
			System.out.println();
		}while(++i <= rows);
	}
}

Please Enter Pyramid Pattern Rows = 10
--------
          *
         ***
        *****
       *******
      *********
     ***********
    *************
   ***************
  *****************
 *******************

在此示例中，PyramidPattern函数打印给定符号的金字塔图案。

package ShapePrograms;

import java.util.Scanner;

public class PyramidPattern4 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Rows = ");
		int rows = sc.nextInt();
		
		System.out.print("Please Enter Character for Pyramid Pattern = ");
		char ch = sc.next().charAt(0);
		
		System.out.println("--------");
		PyramidPattern(rows, ch);
		
	}
	public static void PyramidPattern(int rows, char ch) {
		for (int i = 1 ; i <= rows; i++ ) 
		{
			for (int j = 0 ; j < rows - i; j++ ) 
			{
				System.out.print(" ");
			}
			for (int k = 0 ; k < (i * 2) - 1; k++ ) 
			{
				System.out.print(ch);
			}
			System.out.println();
		}
	}
}

Please Enter Rows = 15
Please Enter Character for Pyramid Pattern = #
--------
              #
             ###
            #####
           #######
          #########
         ###########
        #############
       ###############
      #################
     ###################
    #####################
   #######################
  #########################
 ###########################
#############################