java99乘法表的小练习 正三角 倒三角 正金字塔 倒金字塔

  public static void main(String[] args) {
            System.out.println("-------------------------------原表----------------------------------------");
            for (int i = 1; i <= 9; i++) {
                for (int j = 1; j <= 9; j++) {
                    String text = i + "*" + j + "=";
                    System.out.print(text + i * j + "	");
                }
                System.out.println();
            }
            System.out.println("-----------------------------------------------------------------------------");
            System.out.println("-------------------------------左下三角-------------------------------------------");
            for (int i = 1; i <= 9; i++) {
                for (int j = 1; j <= 9; j++) {
                    String text = i + "*" + j + "=";
                    if (j > i) {
                        System.out.print("	");
                    } else {
                        System.out.print(text + i * j + "	");
                    }
                }
                System.out.println();
            }
            System.out.println("-----------------------------------------------------------------------------");
            System.out.println("-------------------------------右上三角------------------------------------------");
            for (int i = 1; i <= 9; i++) {
                for (int j = 1; j <= 9; j++) {
                    String text = i + "*" + j + "=";
                    if (i > j) {
                        System.out.print("		");
                    } else {
                        System.out.print(text + i * j + "	");
                    }
                }
                System.out.println();
            }
            System.out.println("-----------------------------------------------------------------------------");
            System.out.println("-------------------------------左上三角----------------------------------------");
            for (int i = 1; i <= 9; i++) {
                for (int j = 1; j <= 9; j++) {
                    String text = i + "*" + j + "=";
                    if (i + j > 10) {
                        System.out.print("		");
                    } else {
                        System.out.print(text + i * j + "	");
                    }
                }
                System.out.println();
            }
            System.out.println("-----------------------------------------------------------------------------");
            System.out.println("-------------------------------右下三角----------------------------------------");
            for (int i = 1; i <= 9; i++) {
                for (int j = 1; j <= 9; j++) {
                    String text = i + "*" + j + "=";
                    if (i + j < 10) {
                        System.out.print("		");
                    } else {
                        System.out.print(text + i * j + "	");
                    }
                }
                System.out.println();
            }
            System.out.println("-----------------------------------------------------------------------------");
            System.out.println("-------------------------------正金字塔----------------------------------------");
            for (int i = 1; i <= 9; i++) {
                for (int j = 1; j <= 9; j++) {
                    String text = i + "*" + j + "=";
                    if (i + j < 10) {
                        System.out.print("	");
                    } else {
                        System.out.print(text + i * j + "	");
                    }
                }
                System.out.println();
            }
            System.out.println("-----------------------------------------------------------------------------");
            System.out.println("-------------------------------倒金字塔----------------------------------------");
            for (int i = 1; i <= 9; i++) {
                for (int j = 1; j <= 9; j++) {
                    String text = i + "*" + j + "=";
                    if (j < i) {
                        System.out.print("	");
                    } else {
                        System.out.print(text + i * j + "	");
                    }
                }
                System.out.println();
            }
            System.out.println("-----------------------------------------------------------------------------");
        }

成品

-------------------------------原表----------------------------------------
1*1=1    1*2=2    1*3=3    1*4=4    1*5=5    1*6=6    1*7=7    1*8=8    1*9=9    
2*1=2    2*2=4    2*3=6    2*4=8    2*5=10    2*6=12    2*7=14    2*8=16    2*9=18    
3*1=3    3*2=6    3*3=9    3*4=12    3*5=15    3*6=18    3*7=21    3*8=24    3*9=27    
4*1=4    4*2=8    4*3=12    4*4=16    4*5=20    4*6=24    4*7=28    4*8=32    4*9=36    
5*1=5    5*2=10    5*3=15    5*4=20    5*5=25    5*6=30    5*7=35    5*8=40    5*9=45    
6*1=6    6*2=12    6*3=18    6*4=24    6*5=30    6*6=36    6*7=42    6*8=48    6*9=54    
7*1=7    7*2=14    7*3=21    7*4=28    7*5=35    7*6=42    7*7=49    7*8=56    7*9=63    
8*1=8    8*2=16    8*3=24    8*4=32    8*5=40    8*6=48    8*7=56    8*8=64    8*9=72    
9*1=9    9*2=18    9*3=27    9*4=36    9*5=45    9*6=54    9*7=63    9*8=72    9*9=81    
-----------------------------------------------------------------------------
-------------------------------左下三角-------------------------------------------
1*1=1                                    
2*1=2    2*2=4                                
3*1=3    3*2=6    3*3=9                            
4*1=4    4*2=8    4*3=12    4*4=16                        
5*1=5    5*2=10    5*3=15    5*4=20    5*5=25                    
6*1=6    6*2=12    6*3=18    6*4=24    6*5=30    6*6=36                
7*1=7    7*2=14    7*3=21    7*4=28    7*5=35    7*6=42    7*7=49            
8*1=8    8*2=16    8*3=24    8*4=32    8*5=40    8*6=48    8*7=56    8*8=64        
9*1=9    9*2=18    9*3=27    9*4=36    9*5=45    9*6=54    9*7=63    9*8=72    9*9=81    
-----------------------------------------------------------------------------
-------------------------------右上三角------------------------------------------
1*1=1    1*2=2    1*3=3    1*4=4    1*5=5    1*6=6    1*7=7    1*8=8    1*9=9    
        2*2=4    2*3=6    2*4=8    2*5=10    2*6=12    2*7=14    2*8=16    2*9=18    
                3*3=9    3*4=12    3*5=15    3*6=18    3*7=21    3*8=24    3*9=27    
                        4*4=16    4*5=20    4*6=24    4*7=28    4*8=32    4*9=36    
                                5*5=25    5*6=30    5*7=35    5*8=40    5*9=45    
                                        6*6=36    6*7=42    6*8=48    6*9=54    
                                                7*7=49    7*8=56    7*9=63    
                                                        8*8=64    8*9=72    
                                                                9*9=81    
-----------------------------------------------------------------------------
-------------------------------左上三角----------------------------------------
1*1=1    1*2=2    1*3=3    1*4=4    1*5=5    1*6=6    1*7=7    1*8=8    1*9=9    
2*1=2    2*2=4    2*3=6    2*4=8    2*5=10    2*6=12    2*7=14    2*8=16            
3*1=3    3*2=6    3*3=9    3*4=12    3*5=15    3*6=18    3*7=21                    
4*1=4    4*2=8    4*3=12    4*4=16    4*5=20    4*6=24                            
5*1=5    5*2=10    5*3=15    5*4=20    5*5=25                                    
6*1=6    6*2=12    6*3=18    6*4=24                                            
7*1=7    7*2=14    7*3=21                                                    
8*1=8    8*2=16                                                            
9*1=9                                                                    
-----------------------------------------------------------------------------
-------------------------------右下三角----------------------------------------
                                                                1*9=9    
                                                        2*8=16    2*9=18    
                                                3*7=21    3*8=24    3*9=27    
                                        4*6=24    4*7=28    4*8=32    4*9=36    
                                5*5=25    5*6=30    5*7=35    5*8=40    5*9=45    
                        6*4=24    6*5=30    6*6=36    6*7=42    6*8=48    6*9=54    
                7*3=21    7*4=28    7*5=35    7*6=42    7*7=49    7*8=56    7*9=63    
        8*2=16    8*3=24    8*4=32    8*5=40    8*6=48    8*7=56    8*8=64    8*9=72    
9*1=9    9*2=18    9*3=27    9*4=36    9*5=45    9*6=54    9*7=63    9*8=72    9*9=81    
-----------------------------------------------------------------------------
-------------------------------正金字塔----------------------------------------
                                1*9=9    
                            2*8=16    2*9=18    
                        3*7=21    3*8=24    3*9=27    
                    4*6=24    4*7=28    4*8=32    4*9=36    
                5*5=25    5*6=30    5*7=35    5*8=40    5*9=45    
            6*4=24    6*5=30    6*6=36    6*7=42    6*8=48    6*9=54    
        7*3=21    7*4=28    7*5=35    7*6=42    7*7=49    7*8=56    7*9=63    
    8*2=16    8*3=24    8*4=32    8*5=40    8*6=48    8*7=56    8*8=64    8*9=72    
9*1=9    9*2=18    9*3=27    9*4=36    9*5=45    9*6=54    9*7=63    9*8=72    9*9=81    
-----------------------------------------------------------------------------
-------------------------------倒金字塔----------------------------------------
1*1=1    1*2=2    1*3=3    1*4=4    1*5=5    1*6=6    1*7=7    1*8=8    1*9=9    
    2*2=4    2*3=6    2*4=8    2*5=10    2*6=12    2*7=14    2*8=16    2*9=18    
        3*3=9    3*4=12    3*5=15    3*6=18    3*7=21    3*8=24    3*9=27    
            4*4=16    4*5=20    4*6=24    4*7=28    4*8=32    4*9=36    
                5*5=25    5*6=30    5*7=35    5*8=40    5*9=45    
                    6*6=36    6*7=42    6*8=48    6*9=54    
                        7*7=49    7*8=56    7*9=63    
                            8*8=64    8*9=72    
                                9*9=81    
-----------------------------------------------------------------------------