JAVA層forサイクル正三角形と三角形への印刷を実現

package com.liuc.test;
public class TrianglePrint4 {  

	public static void main(String[] args) {  
		int   n=5; 
		int   a=0; 
		int   b=0;
		for(int i=1;i <=n;i++){ 
			if(a!=(n-i)){ 
			System.out.print( " "); 
			a++; 
			i=i-1; 
			}else   if(b!=(2*i-1)){ 
			System.out.print( "*"); 
			b++; 
			i=i-1; 
			}else   if(a==(n-i)   &&   b==(2*i-1)){ 
			System.out.println(); 
			a=0; 
			b=0;	
			} 
		} 
	}	
	
} 

package com.liuc.test;
public class TrianglePrint5 {  

	public static void main(String[] args) {  
		int   n=5; 
		int   a=0; 
		int   b=0;
		for(int i=n;i >= 1;i--){ 
			if(a!=(n-i)){ 
			System.out.print( " "); 
			a++;   
			i=i+1; 
			}else   if(b!=(2*i-1)){ 
			System.out.print( "*"); 
			b++; 
			i=i+1; 
			}else   if(a==(n-i)   &&   b==(2*i-1)){ 
			System.out.println(); 
			a=0; 
			b=0;	
			} 
		} 
	}	
	
}