字符串反转

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1、

public class StringReverse {            public void swap(char[] arr, int begin, int end) {          while(begin < end) {              char temp = arr[begin];              arr[begin] = arr[end];              arr[end] = temp;              begin++;              end--;          }      }      public String swapWords(String str) {          char[] arr = str.toCharArray();          swap(arr, 0, arr.length - 1);          int begin = 0;          for (int i = 1; i < arr.length; i++) {              if (arr[i] == ' ') {                  swap(arr, begin, i - 1);                  begin = i + 1;              }          }            return new String(arr);      }          public static void main(String[] args) {          String str = "I love java";          System.out.println(new StringReverse().swapWords(str));      }    }

2、

public class Main {        public static void main(String[] args) {          Scanner sc = new Scanner(System.in);                    String str = sc.nextLine();                    String[] sArr = str.split(" ");                   List<String> list = new ArrayList<String>();                    list = Arrays.asList(sArr);            //      for(int i=0;i<sArr.length;i++){           //          list.add(sArr[i]);          //      }                    Collections.reverse(list);                    for(String word:list){                  System.out.print(word+" ");       }   }  }

3、

   public void test09() {              String str = "hello";               for (int i = str.length() - 1; i >= 0; i--) {               char c = str.charAt(i);               System.out.print(c);          }      }

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