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Java实现字符串反转

对于使用Java字符串反转有以下几种实现:

  • 利用StringBuilder类中的reverse函数;
  • 使用递归,将String的首字符放到除首字符外的子串后,然后再递归调用子串;
  • 使用字符数组做reverse;
public class Reverse {	public static String reverse1(String str) {		if (str == null || str.length() <= 1)			return str;		return new StringBuilder(str).reverse().toString();	}		public static String reverse2(String str) {		if (str == null || str.length() <= 1)			return str;		return reverse2(str.substring(1)) + str.charAt(0);	}		public static String reverse3(String str) {		if (str == null || str.length() <= 1)			return str;		char[] ca = new char[str.length()];		for (int i = 0; i < str.length(); i++) {			ca[i] = str.charAt(str.length() - i - 1);		}		return new String(ca);	}		public static void main(String[] args) {		String s = "hello world";				System.out.println(reverse1(s));		System.out.println(reverse2(s));		System.out.println(reverse3(s));	}}

Java实现字符串反转