Java学习笔记---打印图形

Posted 2020-10-18

 1   //1.菱形
 2   public static void Lingxing(int size){
 3     if(size % 2 == 0){
 4       size++;//计算菱形大小
 5     }
 6     //输出菱形上半部
 7     for (int i = 0; i < size/2 + 1; i++) {
 8       for (int j = size/2 + 1; j > i + 1; j--) {
 9         System.out.print(" ");//输出左上角位置的空白
10       }
11       for (int j = 0; j < 2*i + 1; j++) {
12         System.out.print("*");//输出菱形上半部
13       }
14       System.out.println();// 换行
15     }
16     // 输出菱形下半部
17     for (int i = size/2 + 1; i < size; i++) {
18       for (int j = 0; j < i - size/2; j++) {
19         System.out.print(" ");// 输出菱形左下角空白
20       }
21       for (int j = 0; j < 2*size-1 - 2*i ; j++) {
22         System.out.print("*");// 输出菱形下半部
23       }
24       System.out.println();
25     }
26   }
27 
28   // 2.九九乘法表
29   public static void MultiplicationTable(){
30     for (int i = 1; i <= 9; i++) {
31       for (int j = 1; j <= i; j++) {
32         System.out.print(j+"x"+i+"="+i*j+"\t");// \t 跳到下一个TAB位置
33       }
34       System.out.println("");
35     }
36   }
37 
38   //3. 打印三角形
39   public static void Triangle(int n){
40     for (int i = 0; i <= n; i++) {
41       for (int j = n; j >= i; j--) {
42         System.out.print(" ");//建立1号图形
43       }
44       for (int j = 1; j <= i; j++) {
45         System.out.print("*");//建立2号图形
46       }
47       for (int j = 1; j < i; j++) {
48         System.out.print("*");//建立3号图形
49       }
50       System.out.println("");
51     }
52   }
53 
54   //4.打印倒立的三角形
55   public static void InvertedTriangle (int i) {
56     //打印倒立的三角形
57     for (int m = 1; m <= i; m++) {
58        //打印空格
59        for (int n = 0; n <= m; n++) {
60            System.out.print(" ");
61        }
62        //打印*
63        for (int x = 1; x <= 2*(i - m) + 1; x++) {
64            System.out.print("*");
65        }
66        System.out.println();
67     }  
68   }
69   
70   //5.打印平行四边形
71   public static void Parallelogram (int n) {
72     //外层循环 每次打出一个*
73     for (int i = 1; i <=n; i++) {
74       //填充空格
75       for (int j = 1; j <= n - i; j++) {
76           System.out.print(" ");
77       }
78       //内层循环 每次打印一个*
79       for (int k = 1; k <=n; k++) {
80           System.out.print("*");
81       }
82       System.out.println();
83     }
84   }
85 
86   //6.打印平行四边形
87   public static void Rectangle (int n) {
88     //外层循环 每次打出一个*
89     for (int i = 1; i <=n; i++) {
90       //外层循环 每次输出一行*
91       System.out.print("*");
92 
93       //内层循环 每次打印一个*
94       for (int k = 1; k <=n; k++) {
95           System.out.print("*");
96       }
97       System.out.println();
98     }
99   }