生成各种图案

package javademo1;

public class blog {

    public static void main(String[] args) {
        
        for(int n =1;n<=5;n++) {
            for(int m=1;m<=5-n;m++) {
                System.out.print(" ");
            }
            for(int m=1;m<=2*n-1;m++) {
                System.out.print("*");
            }
            System.out.println();
        }
        
        System.out.println();
        
        for(int n =1;n<=4;n++) {
            for(int m=1;m<=n;m++) {
                System.out.print("*");
            }
            System.out.println();
        }
        
        System.out.println();
        
        for(int n =1;n<=4;n++) {
            for(int m=1;m<=5-n;m++) {
                System.out.print("*");
            }
            System.out.println();
        }
        
        System.out.println();
        
        for(int n =1;n<=5;n++) {
            for(int m=1;m<=2*n-1;m++) {
                System.out.print("*");
            }
            System.out.println();
        }
        
        System.out.println();
        
        for(int n =1;n<=5;n++) {
            for(int m=1;m<=5-n;m++) {
                System.out.print(" ");
            }
            for(int m=1;m<=2*n-1;m++) {
                if(m==1 || m==2*n-1) {
                System.out.print("*");
                }else {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
        
        
    }

}