Java 程序打印菱形星形图案
在本文中，我们将学习如何在 Java 中打印菱形星形图案。
插图:
Input: number = 7
Output:
*
***
*****
*******
*********
***********
*************
***********
*********
*******
*****
***
*
方法:当涉及到图案印刷时，我们确实选择了仅通过循环印刷的标准方式。我们将尝试不同类型的循环来打印相同的图案。
示例 1: 使用边做边循环
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to Print Diamond Star Pattern
// Using do-while loop
// Importing input output classes
import java.io.*;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Declaring and initializing variables
// Variable initialized to the row where max star
// should be there as after that they decreases to
// give diamond pattern
int number = 7;
// Diamond starting with single star in first row,so
// initialized
int m = 1;
// Columnar printing
int n;
// Outer loop 1
// Prints the first half diamond
do {
n = 1;
// Inner loop 1
// Prints space until ++n <= number - m + 1 is
// false
do {
// Print whitespace between
System.out.print(" ");
}
// Condition for inside do-while loop 1
while (++n <= number - m + 1);
// Now
n = 1;
// Inner loop 2
// Prints star until ++n <= m * 2 - 1 is false
do {
// Print star
System.out.print("*");
}
// Condition for inner do-while loop 2
while (++n <= m * 2 - 1);
// A new row requires a new line
System.out.println();
}
// Condition for outer do-while loop 1
while (++m <= number);
// Now we are done with printing the upper half
// diamond.
// Note: Not to print the bottom row again in lower
// half diamond printing Hence variable t be
// initialized should one lesser than number
m = number - 1;
// Outer loop 2
// Prints the second half diamond
do {
n = 1;
// Inner loop 1
// Prints space until ++n <= number - m + 1 is
// false
do {
// Print whitespace between
System.out.print(" ");
} while (++n <= number - m + 1);
n = 1;
// Inner loop 2
// Prints star until ++n <= m * 2 - 1 is false
do {
// Prints star
System.out.print("*");
} while (++n <= m * 2 - 1);
// By now done with one row of lower diamond
// printing so a new line is required
System.out.println();
}
// Condition for outer do-while loop 2
while (--m > 0);
}
}
Output
*
***
*****
*******
*********
***********
*************
***********
*********
*******
*****
***
*
示例 2: 使用 while 循环
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to print diamond star pattern
// Using while loop
// Importing input output classes
import java.io.*;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Declaring and initializing variables
// Variable initialized to the row where max star
// should be there as after that they decreases to
// give diamond pattern
int number = 7;
// Diamond starting with single star in first row
int m = 1;
// Columnar printing
int n;
// Outer loop 1
// Prints the first half diamond
// Condition holding true till
// number of rows initialized
while (m <= number) {
n = 1;
// Inner loop 1
// Prints space until n++ <= number - m is false
while (n++ <= number - m) {
// Print whitespaces inbetween
System.out.print(" ");
}
n = 1;
// Inner loop 2
// Prints star until n++ <= m * 2 - 1 is false
while (n++ <= m * 2 - 1) {
// Print star
System.out.print("*");
}
// By now we are done for above pyramid printing
// ending line after each row
System.out.println();
// Incrementing as we want pyramid generation
m++;
}
// Now we are done with printing the upper half
// diamond.
// Note: Not to print the bottom row again in lower
// half diamond printing Hence variable t be
// initialized should one lesser than number
m = number - 1;
// Outer loop 2
// Prints the second half diamond
while (m > 0) {
n = 1;
// Inner loop 1
// Prints spaces until n++ <= number - m is
// false
while (n++ <= number - m) {
// Print whitespace in between
System.out.print(" ");
}
n = 1;
// Inner loop 2
// Prints star until n++ <= m * 2 - 1 is false
while (n++ <= m * 2 - 1) {
// Print star
System.out.print("*");
}
// Ending line after each row
System.out.println();
// Decrementing as we want reverse pyramid
// generation
m--;
}
}
}
Output
*
***
*****
*******
*********
***********
*************
***********
*********
*******
*****
***
*
示例 3: 用于循环
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to print diamond star pattern
// Using for loop
// Importing input output classes
import java.io.*;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Declaring and initializing variables
// Variable initialized to the row where max star
// should be there as after that they decreases to
// give diamond pattern
int number = 7;
int m, n;
// Outer loop 1
// prints the first half diamond
for (m = 1; m <= number; m++) {
// Inner loop 1 print whitespaces inbetween
for (n = 1; n <= number - m; n++) {
System.out.print(" ");
}
// Inner loop 2 prints star
for (n = 1; n <= m * 2 - 1; n++) {
System.out.print("*");
}
// Ending line after each row
System.out.println();
}
// Outer loop 2
// Prints the second half diamond
for (m = number - 1; m > 0; m--) {
// Inner loop 1 print whitespaces inbetween
for (n = 1; n <= number - m; n++) {
System.out.print(" ");
}
// Inner loop 2 print star
for (n = 1; n <= m * 2 - 1; n++) {
System.out.print("*");
}
// Ending line after each row
System.out.println();
}
}
}
Output
*
***
*****
*******
*********
***********
*************
***********
*********
*******
*****
***
*
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