1. 使用数组循环
public static String array(String s){int length=s.length();char[] array=s.toCharArray();for(int i=0;i<length/2;i++){array[i]=s.charAt(length-1-i);array[length-1-i]=s.charAt(i);}return new String(array);}
2. StringBuffer的reverse方法
public static StringBuffer buffer(String s){StringBuffer sb=new StringBuffer();sb.append(s);return sb.reverse();}
3. StringBuffer的循环
public static String buffer2(String s){int length=s.length();StringBuffer sb=new StringBuffer();for(int i=s.length()-1;i>=0;i--){sb.append(s.charAt(i));}return sb.toString();} //StringBuilder比StringBuffer快，但线程不安全
4.栈的后进先出
public static String reverseByStack(String str) {if(str == null || str.length() == 0) {return str;}Stack<Character> strStack = new Stack<Character>();char[] chArray = str.toCharArray();for(Character ch: chArray) {strStack.push(ch);}int len = str.length();for(int i= 0; i< len; i++) {chArray[i] = strStack.pop();}return new String(chArray);}
5. 迭代完成
public static String reverseByRecursive(String str) {if(str == null || str.length() == 0) {return str; }int len = str.length();if(len == 1) {return str;} else {return reverseByRecursive(str.substring(1))+ str.charAt(0);}}
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