在 Java 中列印金字塔形的星星
Sheeraz Gul
2023年10月12日
基於模式的練習是學習 Java 中巢狀迴圈的好方法，列印金字塔結構是進行這些練習的最佳示例。
本教程演示如何在 Java 中列印不同的星形金字塔。
用 Java 列印星星金字塔
按照以下步驟在 Java 中列印星形金字塔。
-
決定行數。
-
外迴圈的第一次迭代將列印金字塔圖案的第一行。
-
外部迴圈內部將有兩個迴圈：第一個迴圈列印每一行的空格，另一個迴圈列印金字塔每一行的星星。
讓我們實現這些步驟：
package delftstack;
import java.util.*;
public class Pyramid_Stars {
public static void main(String[] args) {
int pyramid_rows;
int x;
int pyramid_spaces;
int star_count;
Scanner enter_rows = new Scanner(System.in);
System.out.print("Enter the number of rows of pyramid: ");
pyramid_rows = enter_rows.nextInt();
// This loop will print one row in every iteration
for (x = 0; x < pyramid_rows; x++) {
// this loop will print the spaces
for (pyramid_spaces = x; pyramid_spaces < pyramid_rows; pyramid_spaces++) {
System.out.print(" ");
}
// this loop will print the stars
for (star_count = 0; star_count < (x + 1); star_count++) {
System.out.print("* ");
}
System.out.print("\n");
}
}
}
上面的程式碼將要求使用者輸入金字塔的行數並相應地列印行。
輸出：
Enter the number of rows of pyramid: 7
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
在 Java 中列印星的倒金字塔
現在，讓我們嘗試列印一個倒金字塔形的星星。我們可以通過反轉上面程式碼中描述的過程來列印倒金字塔。
例子：
package delftstack;
import java.util.*;
public class Pyramid_Stars {
public static void main(String[] args) {
int pyramid_rows;
int x;
int pyramid_spaces;
int star_count;
Scanner enter_rows = new Scanner(System.in);
System.out.print("Enter the number of rows of pyramid: ");
pyramid_rows = enter_rows.nextInt();
// This loop will print one row in every iteration
for (x = 0; x < pyramid_rows; x++) {
for (pyramid_spaces = 0; pyramid_spaces < x; pyramid_spaces++) {
System.out.print(" ");
}
for (star_count = x; star_count < pyramid_rows; star_count++) {
System.out.print("* ");
}
System.out.print("\n");
}
}
}
此程式碼將通過從使用者那裡獲取輸入行來列印倒金字塔。
輸出：
Enter the number of rows of pyramid: 7
* * * * * * *
* * * * * *
* * * * *
* * * *
* * *
* *
*
在 Java 中同時列印原始和倒置的雙星金字塔
雙星金字塔將建立一個類似鑽石的形狀。
例子：
package delftstack;
import java.util.*;
public class Pyramid_Stars {
public static void main(String[] args) {
int pyramid_rows;
int x;
int pyramid_spaces;
int star_count;
Scanner enter_rows = new Scanner(System.in);
System.out.print("Enter the number of rows of pyramid: ");
pyramid_rows = enter_rows.nextInt();
// Loops for the first pyramid
for (x = 0; x < pyramid_rows; x++) {
for (pyramid_spaces = x; pyramid_spaces < pyramid_rows; pyramid_spaces++) {
System.out.print(" ");
}
for (star_count = 0; star_count < (x + 1); star_count++) {
System.out.print("* ");
}
System.out.print("\n");
}
// Loops for the inverted pyramid
for (x = pyramid_rows; x > 0; x = (x - 1)) {
for (pyramid_spaces = pyramid_rows; pyramid_spaces >= (x - 1); pyramid_spaces--) {
System.out.print(" ");
}
for (star_count = (x - 1); star_count > 0; star_count--) {
System.out.print("* ");
}
System.out.print("\n");
}
}
}
輸出：
Enter the number of rows of pyramid: 7
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * *
* * * * *
* * * *
* * *
* *
*
在 Java 中列印半個金字塔的星星
要列印半金字塔，我們只需要兩個迴圈。
例子：
package delftstack;
import java.util.*;
public class Pyramid_Stars {
public static void main(String[] args) {
int pyramid_rows;
int x;
int star_count;
Scanner enter_rows = new Scanner(System.in);
System.out.print("Enter the number of rows of pyramid: ");
pyramid_rows = enter_rows.nextInt();
// This loop will print one row in every iteration
for (x = 0; x < pyramid_rows; x++) {
for (star_count = 0; star_count <= x; star_count++) {
System.out.print("* ");
}
System.out.print("\n");
}
}
}
輸出：
Enter the number of rows of pyramid: 7
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
在 Java 中列印倒置的半金字塔形的星星
通過更改上面程式碼中的第二個迴圈，我們可以在 Java 中列印倒置的半金字塔。
例子：
package delftstack;
import java.util.*;
public class Pyramid_Stars {
public static void main(String[] args) {
int pyramid_rows;
int x;
int star_count;
Scanner enter_rows = new Scanner(System.in);
System.out.print("Enter the number of rows of pyramid: ");
pyramid_rows = enter_rows.nextInt();
// This loop will print one row in every iteration
for (x = 0; x < pyramid_rows; x++) {
for (star_count = x; star_count < pyramid_rows; star_count++) {
System.out.print("* ");
}
System.out.print("\n");
}
}
}
輸出：
Enter the number of rows of pyramid: 7
* * * * * * *
* * * * * *
* * * * *
* * * *
* * *
* *
*
作者： Sheeraz Gul
Sheeraz is a Doctorate fellow in Computer Science at Northwestern Polytechnical University, Xian, China. He has 7 years of Software Development experience in AI, Web, Database, and Desktop technologies. He writes tutorials in Java, PHP, Python, GoLang, R, etc., to help beginners learn the field of Computer Science.
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