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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. /* Name of the class has to be "Main" only if the class is public. */
  6. class Ideone {
  7. 	public static void main (String[] args) throws java.lang.Exception {
  8. 		String ret = wrapText("a\nme", 4);
  9. 		System.out.println(ret);
  10. 	}
  11.  
  12. 	public static String wrapText(String text, int maxCharsPerLine) {
  13. 		// check for null or empty input strings
  14. 		if (text.length() == 0 || text == null) {
  15. 			return "";
  16. 		}
  17.  
  18. 		StringBuilder ret_string = new StringBuilder();
  19. 		String temp = "";
  20.  
  21. 		int currentLength = 0, index = 0;
  22. 		char currentLetter = text.charAt(index);
  23. 		int textLength = text.length();
  24.  
  25. 		while (currentLength <= maxCharsPerLine && index < textLength) {
  26. 		    System.out.println("==============================================");
  27. 		    System.out.println("Current Length: " + currentLength);
  28. 		    System.out.println("Index: " + index);
  29.  
  30. 			currentLetter = text.charAt(index);
  31. 			System.out.println("Letter:" + currentLetter);
  32.  
  33. 			// if we're at the end, we should start new line
  34. 			if (Character.isLetter(currentLetter) && currentLength == maxCharsPerLine) {
  35. 			    System.out.println("end of line (1)");
  36.  
  37. 				temp += String.valueOf(currentLetter);
  38. 				String cpy = temp;
  39. 				int wordLength = temp.length()-1;
  40. 				char t = text.charAt(wordLength);
  41.  
  42. 				System.out.println("wordLength: " + wordLength);
  43. 			    System.out.println("we're working on: " + cpy);
  44.  
  45. 				StringBuilder word = new StringBuilder();
  46.  
  47. 				// work backwards: delete from temp and add to word
  48. 				while(Character.isLetter(t)) {
  49. 					t = cpy.charAt(wordLength);
  50. 					word.append(t);
  51.  
  52. 					// delete this character from the temp String
  53. 					temp = temp.substring(0, temp.length()-1);
  54. 					wordLength--;
  55. 				}
  56.  
  57. 				// char t is prolly a newline or space now so we insert a newline
  58. 				ret_string.append(temp);
  59. 				ret_string.append("\n");
  60.  
  61. 				temp = new StringBuffer(word).reverse().toString();
  62.  
  63. 				temp = temp.trim();
  64. 				System.out.println("new temp: " + temp);
  65. 				currentLength = temp.length();
  66.  
  67. 				while (!Character.isLetter(text.charAt(wordLength))) {
  68. 					wordLength++;
  69. 				}
  70.  
  71. 				wordLength = index;
  72. 				index = wordLength;
  73. 				System.out.println("now the index is: " + index);				
  74. 				System.out.println("now the length is: " + currentLength);				
  75.  
  76. 			// reset temp and currentLength to start a new line
  77. 			} else if (currentLetter == '\n') {
  78. 			    System.out.println("newline");
  79. 				temp += String.valueOf(currentLetter);
  80. 				ret_string.append(temp);
  81. 				temp = "";
  82. 				currentLength = 0;
  83.  
  84. 			// Spaces cannot start a line
  85. 			} else if (currentLetter == ' ' && currentLength == 0) {
  86. 			    System.out.println("space cannot start line");
  87. 			    index++;
  88. 				continue;
  89.  
  90. 			// Spaces cannot end a line
  91. 			} else if (currentLetter == ' ' && currentLength == maxCharsPerLine) {
  92. 			    System.out.println("space cannot end line");
  93. 				ret_string.append(temp);
  94. 				ret_string.append("\n");
  95. 				temp = "";
  96. 				currentLength = 0;
  97.  
  98. 			// only one space between words			
  99. 			} else if (currentLetter == ' ' && text.charAt(index-1) == ' ') {
  100. 			    System.out.println("only one space bw words");
  101. 			    index++;
  102. 				continue;
  103.  
  104. 			// append character to temp string
  105. 			} else {
  106. 				temp += String.valueOf(currentLetter);
  107. 				System.out.println("Appending to temp:" + temp);
  108. 				currentLength++;
  109. 			}
  110. 			System.out.println("current final string:\n" + ret_string);
  111. 			index++;
  112. 		}
  113.  
  114. 		// finished with entire string
  115. 		if (temp.length() != 0) {
  116. 			System.out.println("final temp: " + temp);
  117. 			ret_string.append(temp);
  118. 		}
  119. 		return ret_string.toString();
  120. 	}
  121. }
Success #stdin #stdout 0.11s 320576KB
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stdin
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Standard input is empty
stdout
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==============================================
Current Length: 0
Index: 0
Letter:a
Appending to temp:a
current final string:

==============================================
Current Length: 1
Index: 1
Letter:

newline
current final string:
a

==============================================
Current Length: 0
Index: 2
Letter:m
Appending to temp:m
current final string:
a

==============================================
Current Length: 1
Index: 3
Letter:e
Appending to temp:me
current final string:
a

final temp: me
a
me
https://ideone.com/H1A9LH
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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