[for迴圈之直角三角形]

 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("-------------------------");    }}