[for循环之直角三角形]

 public class PrintRightTriangle {
 /*
	直角三角形
*/   
    public void print1(){
        for(int i=1;i<=9;i++){
            for(int j=1;j<=i;j++)
                System.out.print("*");
            
            System.out.print("\n");
        }
    }
    
    public void print2(){
    	for(int i=1;i<=9;i++){
    		for(int j=1;j<=i-1;j++){
    			System.out.print(" ");
    		}
    		for(int k=1;k<=10-i;k++){
    			System.out.print("*");
    		}
    		System.out.print("\n");
    	}
    }
    public void print3(){
        for(int i=1;i<=9;i++){
            for(int j=1;j<=9-i;j++)
                System.out.print(" ");
            for(int k=1;k<=i;k++)
                System.out.print("*");
            
            System.out.print("\n");
        }
    }

    public void print4(){
            for(int i=1;i<=9;i++){
                for(int j=1;j<=10-i;j++)
                    System.out.print("*");
                
                System.out.print("\n");
            }
        }
    public static void main(String[] args) {
        PrintRightTriangle app = new PrintRightTriangle();
        System.out.println("-------------------------");
        app.print1();
        System.out.println("-------------------------");
        app.print2();
        System.out.println("-------------------------");
        app.print3();
        System.out.println("-------------------------");
        app.print4();
        System.out.println("-------------------------");
    }
}