如何在 Java 中镜像文本

Question

我正在尝试创建一个完整的钻石，但我几乎已经完成了所有的工作

T T
Te  Te
Tes   Tes
Test    Test
Test   Tes
Tes  Te
Te T
T

这些 for 循环是创建菱形的原因，但 spaces.substring 是我遇到困难的地方。有谁知道如何通过单独编辑 space.substring 来解决这个问题？

    for (int i = 0 ; i < len; i++)
    { 
        System.out.print(SPACES.substring(0,i));            
        System.out.print (word.substring (0,i) + System.lineSeparator()); 
        //System.out.print(SPACES.substring(i,i+1));
        System.out.print (word.substring (0,i+1));
    }  
    for (int g = len ; g >= 0; g--)
    {          
        System.out.print(SPACES.substring(0,g));           
        System.out.print (word.substring (0,g) + System.lineSeparator());              
        System.out.print (word.substring (0,g));            
    }   

如您所见，每个 for 循环的前两行创建菱形的右半部分，最后几行创建左半部分。但是左半部分没有空格子字符串，因为我不知道我会在里面放什么。

应该是这样的：

                                    H
                                   O O
                                  U   U
                                 S     S
                                E       E
                                 S     S
                                  U   U
                                   O O
                                    H

Answer 1

代码

你可以使用方法吗？

是的：

public static void main(String[] args)
{
    new Main().printDiamond("HOUSE");
}

private void printDiamond(String word)
{
    for (int i = 0 ; i < word.length(); i++)
    {
        printPart(word, i);
    }

    for (int i = word.length() - 2; i >= 0; i--)
    {
        printPart(word, i);
    }
}

private void printPart(String word, int i)
{
    space(word.length() - (i + 1));
    System.out.print(word.charAt(i));
    if (i > 0)
    {
        space((i * 2) - 1);
        System.out.print(word.charAt(i));
    }
    space(word.length() - (i + 1));
    System.out.println();
}

private void space(int i)
{
    for (int j = 0; j < i; j++)
    {
        System.out.print(" ");
    }
}

否：

String word = "HOUSE";
String SPACES = "              ";
int len = word.length();

for (int i = 0 ; i < len; i++)
{
    System.out.print(SPACES.substring(0, len - (i + 1))); //print left padding spaces
    System.out.print(word.charAt(i)); //print left/middle character
    if (i > 0) //we don't want to do this on run 0 because there we only need to print one character in the middle (H)
    {
        System.out.print(SPACES.substring(0, (i * 2) - 1)); //print middle padding spaces
        System.out.print(word.charAt(i)); //print right character
    }
    System.out.println(SPACES.substring(0, len - (i + 1))); //optional: print right padding
}

for (int i = len - 2; i >= 0; i--) //start at len - 2. -1 because arrays start at 0 and -1 because we don't want to print the last character (E) again
{
    System.out.print(SPACES.substring(0, len - (i + 1)));
    System.out.print(word.charAt(i));
    if (i > 0)
    {
        System.out.print(SPACES.substring(0, (i * 2) - 1));
        System.out.print(word.charAt(i));
    }
    System.out.println(SPACES.substring(0, len - (i + 1)));
}

输出

    H    
   O O   
  U   U  
 S     S 
E       E
 S     S 
  U   U  
   O O   
    H