字符串倒序输出的五种方法

//1. 使用数组循环 public static String array(String s){ int length=(); char[] array=(); for(int i=0;i<length/2;i++){ array[i]=(length-1-i); array[length-1-i]=(i); } return new String(array); } //2. StringBuffer的reverse方法 public static StringBuffer buffer(String s){ StringBuffer sb=new StringBuffer(); (s); return sb.reverse(); } //3. StringBuffer的循环 public static String buffer2(String s){ int length=(); StringBuffer sb=new StringBuffer(); for(int i=()-1;i>=0;i--){ ((i)); } return (); } //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) { (ch); } int len = str.length(); for(int i= 0; i< len; i++) { chArray[i] = (); } 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); } }