forloop-pattern用于数字；星形图案

程序：1

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package afterfeb13;

public class patternfornumber {
    public static void main(string[] args) {
        // number1();
        // number2();
        // number3();
        // number4();
        // number5();
        // number6();
        // number7();
        // number8();
        number9();

    }

    private static void number9() {
        for (int row = 1; row <= 9; row++) {
            for (int col = 1; col <= 9; col++) {
                if (row == 1 && (col <= 7 && col >= 3) || row == 5 && (col <= 7 && col >= 3)
                        || row == 9 && (col <= 7 && col >= 3) || col == 3 && row <= 5 || col == 7) {
                    system.out.print("* ");
                }

                else {
                    system.out.print("  ");
                }

            }
            system.out.println();
        }

    }

    private static void number8() {
        for (int row = 1; row <= 9; row++) {
            for (int col = 1; col <= 9; col++) {
                if (row == 1 && (col <= 7 && col >= 3) || row == 5 && (col <= 7 && col >= 3)
                        || row == 9 && (col <= 7 && col >= 3) || col == 3 || col == 7) {
                    system.out.print("* ");
                }

                else {
                    system.out.print("  ");
                }

            }
            system.out.println();
        }

    }

    private static void number7() {
        for (int row = 1; row <= 9; row++) {
            for (int col = 1; col <= 9; col++) {
                if (row == 1 && col > 3 || row + col == 10) {
                    system.out.print("* ");
                }

                else {
                    system.out.print("  ");
                }

            }
            system.out.println();
        }

    }

    private static void number6() {
        for (int row = 1; row <= 9; row++) {
            for (int col = 1; col <= 9; col++) {
                if (row == 1 && (col <= 7 && col >= 3) || row == 5 && (col <= 7 && col >= 3)
                        || row == 9 && (col <= 7 && col >= 3) || col == 3 || col == 7 && row >= 5) {
                    system.out.print("* ");
                }

                else {
                    system.out.print("  ");
                }

            }
            system.out.println();
        }

    }

    private static void number5() {
        for (int row = 1; row <= 9; row++) {
            for (int col = 1; col <= 9; col++) {
                if (row == 1 && (col <= 7 && col >= 3) || row == 5 && (col <= 7 && col >= 3)
                        || row == 9 && (col <= 7 && col >= 3) || col == 3 && row <= 5 || col == 7 && row >= 5) {
                    system.out.print("* ");
                } else {
                    system.out.print("  ");
                }

            }
            system.out.println();
        }

    }

    private static void number4() {
        for (int row = 1; row <= 9; row++) {
            for (int col = 1; col <= 9; col++) {
                if (col == 1 && row <= 5 || col == 5 || row == 5) {
                    system.out.print("* ");
                } else {
                    system.out.print("  ");
                }

            }
            system.out.println();
        }

    }

    private static void number3() {
        for (int row = 1; row <= 9; row++) {
            for (int col = 1; col <= 9; col++) {
                if (row == 1 && (col <= 7 && col >= 3) || row == 5 && (col <= 7 && col >= 3)
                        || row == 9 && (col <= 7 && col >= 3) || col == 7) {
                    system.out.print("* ");
                } else {
                    system.out.print("  ");
                }

            }
            system.out.println();
        }

    }

    private static void number2() {
        for (int row = 1; row <= 9; row++) {
            for (int col = 1; col <= 9; col++) {
                if (row == 1 || col == 9 && row <= 5 || row == 5 || col == 1 && row >= 5 || row == 9) {
                    system.out.print("* ");
                } else {
                    system.out.print("  ");
                }

            }
            system.out.println();
        }

    }

    private static void number1() {
        for (int row = 1; row <= 9; row++) {
            for (int col = 1; col <= 9; col++) {
                if (row == 9 || col == 5 || row + col == 6 && row <= 3) {
                    system.out.print("* ");
                } else {
                    system.out.print("  ");
                }

            }
            system.out.println();
        }

    }

}

>

package afterfeb13;

//54321 star
public class forpatternstar {
    public static void main(string[] args) {

        for (int row = 5; row >= 1; row--) {
            for (int col = 1; col <= row; col++) {
                system.out.print("* ");

            }
            system.out.println();

        }
    }
}