Some small graphics printed with java

Some small graphics printed with java

1. Isosceles triangle

import java.util.Scanner;
public class test1{
    
    

	public static void main(String[] args){
    
    
		
		Scanner input = new Scanner(System.in);
		
		System.out.println("请输入一个三角形的高");
		
		int num = input.nextInt();
		for(int i = 1;i <= num;i++){
    
    
			for(int j = 0;j <num - i;j++)
				System.out.print(" ");
			for(int j = 0;j < 2*i-1;j++)
				System.out.print("*");
			
			System.out.println();
		}	
		System.out.println("\n\n\n\n");
	}
}

2. Isosceles triangle hollowed out

import java.util.Scanner;

public class test1{
    
    

	public static void main(String[] args){
    
    
		
		Scanner input = new Scanner(System.in);
		
		System.out.println("请输入一个三角形的高");
		
		int num = input.nextInt();
		for(int i = 1;i <= num;i++){
    
    
			for(int j = 0;j <num - i;j++)
				System.out.print(" ");
			for(int j = 0;j < 2*i-1;j++)
			{
    
    
				if(i == num)
				{
    
    
					if(j % 2 == 0)
						System.out.print("*");
					else
						System.out.print(" ");
				}else{
    
    
				if(j == 0 || j == (2*i - 2))
					System.out.print("*");
				else
					System.out.print(" ");
				 }
			}

			System.out.println();
		}
	}
}

3.Rhombus

void t_print(){
    
    
		
		Scanner input = new Scanner(System.in);
		System.out.println("请输入菱形的高");
		int num = input.nextInt()/2;
		
		for(int i = 1;i <= num;i++){
    
    
			for(int k = 0;k < num-i+1;k++)
				System.out.print(" ");
				
			for(int j = 0;j <(2*i - 1);j++)				
				System.out.print("*");		
			
			System.out.println();		
		}
		
		for(int i = num-1;i>0;i--){
    
    
			for(int k = 0;k < num-i+1;k++)
				System.out.print(" ");
			for(int j = 0;j < 2*i-1;j++)
				System.out.print("*");	
			System.out.println();
		}
		
	}

4. Hollowed diamond

void t_print(){
    
    
		
		Scanner input = new Scanner(System.in);
		System.out.println("请输入菱形的高");
		int num = input.nextInt()/2;
		
		for(int i = 1;i <= num;i++){
    
    
			for(int k = 0;k < num-i+1;k++)
				System.out.print(" ");
				
			for(int j = 0;j <(2*i - 1);j++)	
			{
    
    
				if(j == 0 || j == 2*i-2)
					System.out.print("*");
				else
					System.out.print(" ");
			}				
			System.out.println();
	
		}
		
		for(int i = num-1;i>0;i--){
    
    
			for(int k = 0;k < num-i+1;k++)
				System.out.print(" ");
			for(int j = 0;j < 2*i-1;j++){
    
    
				if(j == 0 || j == 2*i-2)
					System.out.print("*");
				else
					System.out.print(" ");
			}	
			System.out.println();
		}
		
	}

Print Yanghui Triangle

import java.util.Scanner;

public class Test {
    
    
	
	public static void main(String[] args) {
    
    
		
		Scanner input = new Scanner(System.in);
		System.out.print("请输入杨辉三角的高：");
		
		int num = input.nextInt();
		
		int[][] arr = new int[num][];
		
		arr[0] = new int[1];
		arr[0][0] = 1;
		
		for(int i = 1;i < num;i++) {
    
    
			arr[i] = new int[i+1];
			for(int j = 0;j <= i;j++) {
    
    

				if(j == i || j == 0) {
    
    
					arr[i][j] = 1;
					continue;
				}

				arr[i][j] = arr[i-1][j-1] + arr[i-1][j];
			}
		}
	
		for(int i = 0;i < arr.length;i++) {
    
    
			for(int j = 0;j < arr[i].length;j++) {
    
    
				System.out.print(arr[i][j] + "\t");
			}
			System.out.println();
		}
	}
}