Java 程式以列印金字塔星號圖案


在本文中,我們將瞭解如何列印金字塔星號圖案。該圖案透過使用多個 for-loops 和 print 語句形成的。

以下是它的演示−

輸入

假設我們的輸入為 −

Enter the number of rows : 8

輸出

所需輸出為 −

The pyramid star pattern : 
       *
      * *
     * * *
    * * * *
   * * * * *
  * * * * * *
 * * * * * * *
* * * * * * * *

演算法

Step 1 - START
Step 2 - Declare three integer values namely i, j and my_input
Step 3 - Read the required values from the user/ define the values
Step 4 - We iterate through two nested 'for' loops inside a ‘for’ loop to get space between the characters.
Step 5 - After iterating through the innermost loop, we iterate through another 'for' loop. This will help print the required character.
Step 6 - Now, print a newline to get the specific number of characters in the subsequent lines.
Step 7 - Display the result
Step 8 - Stop

示例 1

此處,輸入是使用者根據提示輸入的。你可以嘗試在我們 編碼實踐工具 run button 中即時執行此示例。

import java.util.Scanner;
public class Pyramid{
   public static void main(String args[]){
      int i, j, my_input;
      System.out.println("Required packages have been imported");
      Scanner my_scanner = new Scanner(System.in);
      System.out.println("A reader object has been defined ");
      System.out.print("Enter the number of rows : ");
      my_input = my_scanner.nextInt();
      System.out.println("The pyramid star pattern : ");
      for (i=0; i<my_input; i++){
         for (j=my_input-i; j>1; j--){
            System.out.print(" ");
         }
         for (j=0; j<=i; j++ ){
            System.out.print("* ");
         }
         System.out.println();
      }
   }
}

輸出

Required packages have been imported
A reader object has been defined
Enter the number of rows : 8
The pyramid star pattern :
       *
      * *
     * * *
    * * * *
   * * * * *
  * * * * * *
 * * * * * * *
* * * * * * * *

示例 2

此處,整數已預先定義,其值會在控制檯上被訪問和顯示。

public class Pyramid{
   public static void main(String args[]){
      int i, j, my_input;
      my_input = 8;
      System.out.println("The number of rows is defined as " +my_input);
      System.out.println("The pyramid star pattern : ");
      for (i=0; i<my_input; i++){
         for (j=my_input-i; j>1; j--){
            System.out.print(" ");
         }
         for (j=0; j<=i; j++ ){
            System.out.print("* ");
         }
         System.out.println();
      }
   }
}

輸出

The number of rows is defined as 8
The pyramid star pattern : 
       *
      * *
     * * *
    * * * *
   * * * * *
  * * * * * *
 * * * * * * *
* * * * * * * *

更新於: 22-2-2022

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