java逆转字符串

Posted 2022-11-24 xieweikun7

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

/**
 * 逆转字符串
 * @author 谢伟锟
 *
 */
public class Reverse 

	/**
	 * 逆转字符串 "I love Java"-->"Java love I"
	 * @param str
	 * @return
	 */
	public static String Reverse1(String str)
		String[] strs = str.split(" ");
		List<String> list = new ArrayList<String>();
		// 字符串数据转为list
		list = Arrays.asList(strs);
		Collections.reverse(list);
		String wordString = "";
		for(int i=0;i<list.size();i++)
			wordString = wordString + list.get(i) + " ";
		
		return wordString;
	
	
	/**
	 * 逆转字符串 abcdefg-->gfedcba
	 * @param str
	 * @return
	 */
	public static String Reverse2(String str)
		return new StringBuilder(str).reverse().toString();
 	
	
	public static void main(String[] args) 
		System.out.println(Reverse1("I love Java"));
		System.out.println(Reverse2("abcdefg"));