Java Program to Print Diamond Shape Star Pattern

// 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 to 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);  } } 

// 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--;  }  } } 

// 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();  }  } }