在控制台打印一个菱形&写一段程序,取两个数组的交集
1.在控制台打印一个菱形。
1 package lession0711B; 2 3 public class TestB1 { 4 5 public static void main(String[] args) { 6 int n = 7; 7 for (int i = 1; i <= n; i++) {// 控制输出几行 8 9 // 1.空格 10 for (int j = 1; j <= (i - n / 2 - 1 > 0 ? i - n / 2 - 1 : n / 2 + 1 - i); j++) { 11 System.out.print(" "); 12 } 13 14 // 2.星号 15 for (int k = 1; k <= n - 2 * (i - n / 2 - 1 > 0 ? i - n / 2 - 1 : n / 2 + 1 - i); k++) { 16 System.out.print("*"); 17 } 18 System.out.println(); 19 } 20 } 21 22 }





2.写一段程序,取两个数组的交集。
1 package lession0711B; 2 3 import java.util.Arrays; 4 5 public class Test2 { 6 7 public static void main(String[] args) { 8 int[] array1 = new int[5]; 9 int[] array2 = new int[5]; 10 int[] array3 = new int[5]; 11 for (int i = 0; i < 5; i++) {// 给数组A随机赋值5个 12 array1[i] = (int) (Math.random() * 10); 13 } 14 for (int i = 0; i < 5; i++) {// 给数组B随机赋值5个 15 array2[i] = (int) (Math.random() * 10); 16 } 17 int cont = 0; 18 for (int i = 0; i < 5; i++) {// 把A、B数组中相同的值赋值给数组C 19 for (int j = 0; j < 5; j++) { 20 if (array1[i] == array2[j]) { 21 array3[cont] = array1[i]; 22 cont++; 23 break; 24 } 25 } 26 } 27 int a = 1; 28 if (array3[4] == 0) { 29 for (int i = 0; i < 4; i++) {// 判断数组A中是否有0 30 if (array1[i] == 0) { 31 break; 32 } else if (i == 3) { 33 a -= 1; 34 } 35 } 36 for (int i = 0; i < 4; i++) {// 判断数组B中是否有0 37 if (array2[i] == 0) { 38 break; 39 } else if (i == 3 && a == 1) { 40 a -= 1; 41 } 42 } 43 } 44 for (int i = 0; i < 4; i++) {// 判断A、B数组中相同值的个数 45 for (int j = i + 1; j < 4; j++) 46 if (array3[i] == array3[j]) { 47 break; 48 } else if (j == 3) { 49 a++; 50 } 51 } 52 int[] array4 = new int[a]; 53 int m = 0; 54 for (int i = 0; i < 4; i++) {// 把array3数组中的值赋给数组array4 55 for (int j = i + 1; j < 4; j++) 56 if (array3[i] == array3[j]) { 57 break; 58 } else if (j == 3) { 59 array4[m] = array3[i]; 60 m++; 61 } 62 } 63 // System.out.println(a); 64 System.out.println("数组A:" + Arrays.toString(array1)); 65 System.out.println("数组B:" + Arrays.toString(array2)); 66 // System.out.println("数组A和B的交集:"+Arrays.toString(array3)); 67 if (a != 0) { 68 System.out.println("数组A和B的交集:" + Arrays.toString(array4)); 69 } else { 70 System.out.println("两个数组没有交集!"); 71 } 72 } 73 74 }
集合要去重并要数组中多余的0:




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