자바 기초 연습 문제, for 순환 사용, 정사각형 인쇄, 삼각형 등

for(int m=1;m<=2;m++){
			for (int n=1;n<=2;n++){
				System.out.print("* ");
			}
			System.out.println();//    
		}

		//        
		for(int q=1;q<=3;q++){
			
			for(int w=1;w<=q;w++){
				
				System.out.print(" * ");	
			}
			System.out.println();
		}
		//        
		for(int q=1;q<=3;q++){
			
			for(int w=q;w<=3;w++){
				
				System.out.print(" * ");	
			}
			System.out.println();
		}

		//      ，   for      
		for (int q = 1; q <= 3; q++) {
			//           ，     ，      **  
			for (int e = 1; e <= 3 - q; e++) {
				System.out.print(" ");
			}
			for (int w = 1; w <= q; w++) {

				System.out.print("* ");
			}
			System.out.println();
		}

for (int q = 1; q <= 4; q++) {
			//           ，     ，      **  
			for (int e = q; e <= 3; e++) {
				System.out.print(" ");
			}
			for (int w = 1; w <= 4; w++) {

				System.out.print("* ");
			}
			System.out.println();
		}

		for(int a=1;a<=9;a++){
			for(int b=1;b<=a;b++){
				System.out.print(a+"*"+b+"="+a*b+" ");
			}
			System.out.println(" ");
		}

int year=2000;
		if((year%4==0&&year%100!=0)|(year%100==0&&year%400==0)){
			System.out.println("  ");
		}else{
			System.out.println("   ");
		}

	   // java   while   
	   int a=1;
	   while(a<=10){
		   System.out.println(a+"     ");
		   a++;
	   }
	   //do while   
	
	   int y = 0;
	   do
	   {
	     System.out.println("doWhile    :"+y);
	     y++;
	   }while(y>0 && y<10);

//          ，    ：      
	public static int method2(int n){
		if(n==1){
			return 1;
		}
		else{
			
			return n+ method2(n-1);
		}
	}
	//       （1 n）
	public static int method4(int n){
		if(n==1){
			return 1;
		}
		else{
			return n * method4(n-1);
		}
		
	}