Java Fundamentals Hardening 08: Several ways to output strings in reverse (including spaces)

1. The easiest estimate is to use the ToCharArray () of the String classand then reverse the method of outputting the array:

1  Packagehimi.hebao05;2 3  Public classTestDemo02 {4      Public Static voidMain (string[] args) {5         inti = 0;6String Text = "Hebao I love you!";7String result = "";8         Char[] Chararray =Text.tochararray ();9          for(intj = chararray.length-1; j>=0; j--) {TenResult + =Chararray[j]; One         } A System.out.println (result); -     } -}

Here, the string string type of data (not at the end) is converted to a char[] character array, so that you can control the reverse output: The result is as follows:

2. The string is defined as a string class, converted to a StringBuffer class, using the reverse () method in the StringBuffer class to reverse the string directly.

1  Packagehimi.hebao05;2 3  Public classTestDemo02 {4      Public Static voidMain (string[] args) {5         inti = 0;6String Text = "Hebao I love you!";7  8 reverseString1 (text);9     }Ten      One      A      Public Static voidreverseString1 (String text) { -StringBuffer StringBuffer =NewStringBuffer (text); - System.out.print (Stringbuffer.reverse ()); the     } -      -}

The results of the operation are as follows:

3. Convert a string to byte[], byte[] is to store each character of the string as a byte type, but not a char type. So there is no direct reverse output (not like 1). However, we can convert the string to byte[] , and then we can exchange the elements in the end of the symmetry, so that the reverse output is achieved:

1  Packagehimi.hebao05;2 3  Public classTestDemo02 {4      Public Static voidMain (string[] args) {5         inti = 0;6String Text = "Hebao I love you!";7 System.out.println (reverseString2 (text));8 9     }Ten      One      Public Staticstring ReverseString2 (string text) { A         if(Text = =NULL|| Text.length () <0 ) { -             return"ERROR"; -         } the         byte[] bytes =text.getbytes (); -          for(inti=0; i<bytes.length/2; i++) { -             byteb=Bytes[i]; -Bytes[i] = bytes[bytes.length-1-i]; +Bytes[bytes.length-1-i] =b; -         } +          A         return  NewString (bytes); at     } - +   }

The output results are as follows:

Java Fundamentals Hardening 08: Several ways to output strings in reverse (including spaces)