Java 程序 - Patternmaker |如何让奇数列显示？

Question

为了我的家庭作业，我需要使用 for 嵌套循环制作一个模式。它需要看起来像这样： pattern for 5 rows and 7 columns

但是，当我编写代码时，我无法弄清楚如何使列（如果是奇数）出现。我认为我需要添加另一个 If/else 语句。这是我的代码：

public class PatternMaker {

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {

    // Declaration

   int numrows = 5;
   int numcols = 7;
   String str1= "XX";
   String str2 = "OO";
   String sep = "***";

   if (numcols % 2 == 0) {  // if columns is even
       // for each row
       for (int i = 1; i <= numrows; i++) {

           // for each column
           for (int k = 0; k < numcols/ 2; k++) {

               if ( i % 2 == 1) { // for odds
                     if(k > 0) {
                        System.out.print(sep + str1 + sep+ str2);
                        }
                    else 
                        System.out.print(str1 + sep + str2);
                } 
               else {   // for evens
                     if(k > 0) {
                        System.out.print(sep + str2 + sep + str1);
                        }
                    else 
                        System.out.print(str2 + sep + str1);
                } 
        }
           System.out.println();                         
       } 

   }





else {  // if columns is odd
       // for each row
       for (int i = 1; i <= numrows; i++) {

           // for each column
           for (int k = 0; k < (numcols/ 2); k++) {
               if ( i % 2 == 1) { // for odds
                     if(k > 0) {
                        System.out.print(sep + str1 + sep+ str2);
                        }

                    else 
                        System.out.print(str1 + sep + str2);
                } 
               else {   // for evens
                     if(k > 0) {
                        System.out.print(sep + str2 + sep + str1);
                        }

                    else 
                        System.out.print(str2 + sep + str1);                        
                } 
        }
           System.out.println();                         
       } 

}

Answer 1

给你：

// Declaration
int numrows = 5;
int numcols = 7;
String str1 = "XX";
String str2 = "OO";
String sep = "***";

for (int i = 0; i < numrows; i++) {
    for (int j = 0; j < numcols; j++) {
        if (j != 0) {
            System.out.print(sep);
        }
        if (i % 2 == 0) {

            if (j % 2 == 0) {
                System.out.print(str1);
            } else {
                System.out.print(str2);
            }
        } else if (j % 2 == 0) {
            System.out.print(str2);
        } else {
            System.out.print(str1);
        }

    }
    System.out.println("");
}

Java 程序 - Patternmaker |如何让奇数列显示？

Java Program - Patternmaker | How to make odd columns show?

loops

for-loop

if-statement

nested-loops