Java 中的字母图案

2025年3月17日 | 阅读 10 分钟
在 Java 中，就像金字塔和三角形图案一样，字母图案也是由大多数面试官提供给开发人员编写代码的。字母图案（如 A、B、C 等）的设计基于用户给定的图案高度。图案的宽度是根据用户输入的 h 计算的。
我们将在单个程序中打印从 A 到 Z 的所有字母。我们将为每个字母创建一个不同的方法来打印图案。
让我们来实现代码来为每个字母打印图案。
AlphabetPatternProgram.java
//import required classes and package, if any
import java.util.Scanner;
//create AlphabetPatternProgram class to print the alphabet
public class AlphabetPatternProgram {
	// create absValue() method to get absolute value
	public static int absValue(int n) {
		if(n < 0) {
			return (-1 * n);
		}else {
			return n;
		}
	}
	// create drawPatternA() method to print the pattern of 'A'
	public static void drawPatternA(int h, int w){
		int n = w / 2;
		for (int i = 0; i < h; i++) {
			for (int j = 0; j <= w; j++) {
				if (j == n || j == (w - n) || (i == h / 2 && j > n && j < (w - n))) {
					System.out.printf("*");
				} else {
					System.out.printf(" ");
				}
	        }
	        System.out.printf("\n");
	        n--;
		}
	}
	// create drawPatternB() method to print the pattern of 'B'
	public static void drawPatternB(int h, int w){
		int mid = (h / 2);
		for(int i = 0; i < h; i++) {
			System.out.printf("*");
			for(int j = 0; j < w; j++) {
				if((i == 0 || i == h - 1 || i == mid) && j < (w - 2)) {
					System.out.printf("*");
				} else if (j == (w - 2) && !(i == 0 || i == h - 1 || i == mid)) {
	                System.out.printf("*");
				} else {
					System.out.printf(" ");
				}
			}
			System.out.printf("\n");
		}
	}
	// create drawPatternC() method to print the pattern of 'C'
	public static void drawPatternC(int h){
		for(int i = 0; i < h; i++) {
			System.out.printf("*");
			for (int j = 0; j < (h - 1); j++) {
				if (i == 0 || i == h - 1) {
					System.out.printf("*");
				} else {
					continue;
				}
	        }
	        System.out.printf("\n");
		}
	}
	// create drawPatternD() method to print the pattern of 'D'
	public static void drawPatternD(int h){
		for(int i = 0; i < h; i++) {
			System.out.printf("*");
			for (int j = 0; j < h; j++) {
				if((i == 0 || i == h - 1) && j < h - 1) {
					System.out.printf("*");
				}else if (j == h - 1 && i != 0 && i != h - 1) {
					System.out.printf("*");
				}else {
					System.out.printf(" ");
		        }
		    }
			System.out.printf("\n");
		}
	}
	// create drawPatternE() method to print the pattern of 'E'
	public static void drawPatternE(int h){
		for (int i = 0; i < h; i++) {
			System.out.printf("*");
			for (int j = 0; j < h; j++) {
				if ((i == h / 2 && j <= h / 2) || (i == 0 || i == h - 1)) {
					System.out.printf("*");
				} else {
					continue;
				}
			}
			System.out.printf("\n");
	    }
	}
	// create drawPatternF() method to print the pattern of 'F'
	public static void drawPatternF(int h){
		for (int i = 0; i < h; i++) {
			System.out.printf("*");
			for (int j = 0; j < h; j++) {
				if ((i == h / 2 && j <= h / 2) || i == 0) {
					System.out.printf("*");
				} else {
					continue;
				}
			}
			System.out.printf("\n");
	    }
	}
	// create drawPatternG() method to print the pattern of 'G'
	public static void drawPatternG(int h, int w){
		w--;
		for(int i = 0; i < h; i++) {
			for(int j = 0; j < w; j++) {
				if((j == 0 || j == w -1 ) && (i == 0 || i == h -1)) {
					System.out.printf(" ");
				}else if(j == 0) {
					System.out.printf("*");
				}else if(i == 0 && j <= h) {
					System.out.printf("*");
				}else if(i == h / 2 && j > h / 2) {
					System.out.printf("*");
				}else if(i > h / 2 && j == w - 1) {
					System.out.printf("*");
				}else if(i == h - 1 && j < w) {
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			System.out.printf("\n");
		}
	}
	// create drawPatternH() method to print the pattern of 'H'
	public static void drawPatternH(int h){
		for(int i = 0; i < h; i++) {
			System.out.printf("*");
			for(int j = 0; j < h; j++) {
				if((j == h - 1) || (i == h / 2)) {
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			System.out.printf("\n");
		}
	}
	// create drawPatternI() method to print the pattern of 'I'
	public static void drawPatternI(int h){
		
		for(int i = 0; i < h; i++) {
			for(int j = 0; j < h; j++) {
				if((i == h - 1) || (i == 0)) {
					System.out.printf("*");
				}else if(j == h / 2){
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			System.out.printf("\n");
		}
	}
	// create drawPatternJ() method to print the pattern of 'J'
	public static void drawPatternJ(int h){
		
		for(int i = 0; i < h; i++) {
			for(int j = 0; j < h; j++) {
				if((i == h - 1) && (j > 0 && j < h - 1)) {
					System.out.printf("*");
				}else if((j == h - 1 && i != h - 1) || (i > (h / 2) - 1 && j == 0 && i != h - 1 )){
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			System.out.printf("\n");
		}
	}
	// create drawPatternK() method to print the pattern of 'K'
	public static void drawPatternK(int h){
		int mid = h / 2;
		int temp = mid;
		
		for(int i = 0; i < h; i++) {
			System.out.printf("*");
			for(int j = 0; j <= mid; j++) {
				if(j == absValue(temp)) {
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			System.out.printf("\n");
			temp = temp - 1;
		}
	}
	// create drawPatternL() method to print the pattern of 'L'
	public static void drawPatternL(int h){
		for(int i = 0; i < h; i++) {
			System.out.printf("*");
			for(int j = 0; j <= h; j++) {
				if(i == h - 1) {
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			System.out.printf("\n");
		}
	}
	// create drawPatternM() method to print the pattern of 'M'
	public static void drawPatternM(int h){
		int count = 0;
		for(int i = 0; i < h; i++) {
			System.out.printf("*");
			for(int j = 0; j <= h; j++) {
				if(j == h) {
					System.out.printf("*");
				}else if(j == count || j == (h - count - 1)){
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			if(count == h / 2) {
				count = -99999;
			}else {
				count = count + 1;
			}
			System.out.printf("\n");
		}
	}
	// create drawPatternN() method to print the pattern of 'N'
	public static void drawPatternN(int h){
		int count = 0;
		for(int i = 0; i < h; i++) {
			System.out.printf("*");
			for(int j = 0; j <= h; j++) {
				if(j == h) {
					System.out.printf("*");
				}else if(j == count){
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			count = count + 1;
			System.out.printf("\n");
		}
	}
	// create drawPatternO() method to print the pattern of 'O'
	public static void drawPatternO(int h){
		
		int spc = h / 3;
		int w = h / 2 + h / 5 + spc + spc;
		for(int i = 0; i < h; i++) {
			for(int j = 0; j <= w; j++) {
				if(j == (w - absValue(spc)) || j == absValue(spc)) {
					System.out.printf("*");
				}else if((i == 0 || i == (h - 1)) && j > absValue(spc) && j < (w - absValue(spc))){
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			if(spc != 0 && i < h / 2) {
				spc = spc - 1;
			}else if(i >= (h / 2 + h / 5)) {
				spc = spc - 1;
			}
			System.out.printf("\n");
		}
	}
	// create drawPatternP() method to print the pattern of 'P'
	public static void drawPatternP(int h){
		
		for(int i = 0; i < h; i++) {
			System.out.printf("*");
			for(int j = 0; j <= h; j++) {
				if((i == 0 || i == h / 2) && j < h - 1) {
					System.out.printf("*");
				}else if(i < h / 2 && j == h - 1 && i != 0){
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			System.out.printf("\n");
		}
	}	
	// create drawPatternQ() method to print the pattern of 'Q'
	public static void drawPatternQ(int h){
		
		int temp = h;
		
		// call drawPatternO() method to print pattern of 'O'
		drawPatternO(h);
		for(int i = 0; i < h / 2; i++) {
			for(int j = 0; j <= temp; j++) {
				if(j == temp) {
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			System.out.printf("\n");
			temp = temp + 1;
		}
	}
	// create drawPatternR() method to print the pattern of 'R'
	public static void drawPatternR(int h, int w){
		
		int mid = h / 2;
		
		for(int i = 0; i < h; i++) {
			System.out.printf("*");
			for(int j = 0; j < w; j++) {
				if((i == 0 || i == mid) && j < (w - 2)) {
					System.out.printf("*");
				}else if(j == (w - 2) && !(i == 0 || i == mid)){
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			System.out.printf("\n");
		}
	}
	// create drawPatternS() method to print the pattern of 'S'
	public static void drawPatternS(int h){
		
		for(int i = 0; i < h; i++) {
			for(int j = 0; j < h; j++) {
				if((i == 0 || i == h / 2 || i == h - 1)) {
					System.out.printf("*");
				}else if(i < h / 2 && j == 0){
					System.out.printf("*");
				}else if(i > h / 2 && j == h - 1){
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			System.out.printf("\n");
		}
	}
	// create drawPatternT() method to print the pattern of 'T'
	public static void drawPatternT(int h){
		
		for(int i = 0; i < h; i++) {
			for(int j = 0; j < h; j++) {
				if(i == 0) {
					System.out.printf("*");
				}else if(j == h / 2){
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			System.out.printf("\n");
		}
	}
	// create drawPatternU() method to print the pattern of 'U'
	public static void drawPatternU(int h){
		
		for(int i = 0; i < h; i++) {
			if(i != 0 && i != h - 1) {
				System.out.printf("*");
			}else {
				System.out.printf(" ");
			}
			for(int j = 0; j < h; j++) {
				if(((i == h - 1) && j >= 0 && j < h - 1)) {
					System.out.printf("*");
				}else if(j == h - 1 && i != 0 && i != h - 1){
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			System.out.printf("\n");
		}
	}
	// create drawPatternV() method to print the pattern of 'V'
	public static void drawPatternV(int h, int w){
		
		int count = 0;
		
		for(int i = 0; i < h; i++) {
			for(int j = 0; j <= w; j++) {
				if(j == count || j == (w - count - 1)) {
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			count = count + 1;
			System.out.printf("\n");
		}
	}
	// create drawPatternW() method to print the pattern of 'W'
	public static void drawPatternW(int h){
		
		int count = h / 2;
		
		for(int i = 0; i < h; i++) {
			System.out.printf("*");
			for(int j = 0; j <= h; j++) {
				if(j == h) {
					System.out.printf("*");
				}else if((i >= h / 2) && (j == count || j == h - count - 1)){
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			if(i >= h / 2) {
				count = count + 1;
			}
			System.out.printf("\n");
		}
	}
	// create drawPatternX() method to print the pattern of 'X'
	public static void drawPatternX(int h){
		
		int count = 0;
		
		for(int i = 0; i <= h; i++) {
			for(int j = 0; j <= h; j++) {
				if(j == count || j == h - count) {
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			count = count + 1;
			System.out.printf("\n");
		}
	}
	// create drawPatternY() method to print the pattern of 'Y'
	public static void drawPatternY(int h){
		
		int count = 0;
		
		for(int i = 0; i <= h; i++) {
			for(int j = 0; j < h; j++) {
				if(j == count || j == h - count && i <= h / 2) {
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			if(i < h / 2) {
				count = count + 1;
			}
			System.out.printf("\n");
		}
	}
	// create drawPatternZ() method to print the pattern of 'Z'
	public static void drawPatternZ(int h){
		
		int count = h - 1;
		
		for(int i = 0; i < h; i++) {
			for(int j = 0; j < h; j++) {
				if(i == 0 || i == h - 1 || j == count) {
					System.out.printf("*");
				}else {
					System.out.printf(" ");
				}
			}
			count = count - 1;
			System.out.printf("\n");
		}
	}
	// main() method start
	public static void main(String args[]){ 
	
		char c; 
	
		int n;
		
		// create an instance of Scanner class
		Scanner sc = new Scanner(System.in);
	
		System.out.println("Enter height of the pattern:");
		n = sc.nextInt();
		
		System.out.println("Enter character from A-Z to print:");
		c = sc.next().charAt(0);
	
		// close Scanner class object
		sc.close();
	
		switch (c) {
			case 'A':
				drawPatternA(n, (2 * n) - 1); 
				break;
			case 'B':
				drawPatternB(n, (2 * n) - 1); 
				break;
			case 'C':
				drawPatternC(n);
				break;
			case 'D':
				drawPatternD(n);
				break;
			case 'E':
				drawPatternE(n);
				break;
			case 'F':
				drawPatternF(n);
				break;
			case 'G':
				drawPatternG(n, (2 * n) - 1); 
				break;
			case 'H':
				drawPatternF(n);
				break;
			case 'I':
				drawPatternF(n);
				break;
			case 'J':
				drawPatternF(n);
				break;
			case 'K':
				drawPatternF(n);
				break;
			case 'L':
				drawPatternF(n);
				break;
			case 'M':
				drawPatternF(n);
				break;
			case 'N':
				drawPatternF(n);
				break;
			case 'O':
				drawPatternF(n);
				break;
			case 'P':
				drawPatternF(n);
				break;
			case 'Q':
				drawPatternF(n);
			    break;
			case 'R':
				drawPatternR(n, (2 * n) - 1); 
			    break;
			case 'S':
				drawPatternF(n);
			    break;
			case 'T':
				drawPatternF(n);
			    break;
			case 'U':
				drawPatternF(n);
			    break;
			case 'V':
				drawPatternV(n, (2 * n) - 1); 
			    break;
			case 'W':
				drawPatternF(n);
			    break;
			case 'X':
				drawPatternF(n);
			    break;
			case 'Y':
				drawPatternF(n);
			    break;
			case 'Z':
				drawPatternF(n);
			    break;
		}
	}
}
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