字符串操作之语序颠倒/大小写互转

  1 package com.fhcq.reverseAndChange;
  2 
  3 /*
  4  * 编程实现将字符串先进行大小写互转，再进行字符串反转。
  5  * 输入：AuJKtHyKy
  6  * 输出：YkYhTkjUa
  7  */
  8 public class ReverseAndChange {
  9 
 10 	public static void main(String[] args) {
 11 		String s = "AuJKtHyKy";
 12 		reverseAndChange(s);
 13 	}
 14 
 15 	public static void reverseAndChange(String str) {
 16 
 17 		char[] ch = str.toCharArray();// 字符串转换为字符数组
 18 		StringBuffer sb = new StringBuffer();
 19 		for (int i = 0; i < ch.length; i++) {
 20 			if (ch[i] >= ‘a‘ && ch[i] <= ‘z‘) {
 21 				sb.append(String.valueOf(ch[i]).toUpperCase());
 22 			} else if (ch[i] >= ‘A‘ && ch[i] <= ‘Z‘) {
 23 				sb.append(String.valueOf(ch[i]).toLowerCase());
 24 			}
 25 		}
 26 		String result = sb.reverse().toString();// 将sb逆序，并转换为字符串形式
 27 		System.out.println(result);
 28 	}
 29 
 30 }
 31 

  1 package com.fhcq.sentenceReverse;
  2 
  3 /**
  4  * 请编写一段代码，将下面的句子的语序颠倒：
  5  * “Long long ago , there lived a king”。
  6  * （提示：即把上述句子变成“king a lived there , ago long Long”）。
  7  */
  8 import java.util.ArrayList;
  9 import java.util.List;
 10 
 11 public class SentenceReverse {
 12 	public static void main(String[] args) {
 13 
 14 		String str = "Long long ago , there lived a king";
 15 
 16 		List<String> list = new ArrayList<String>();
 17 
 18 		StringBuffer buffer = new StringBuffer(str).reverse();
 19 		String[] strings = buffer.toString().split(" ");
 20 
 21 		for (String string : strings) {
 22 			StringBuilder builder = new StringBuilder(string).reverse();
 23 			list.add(builder.toString());
 24 		}
 25 
 26 		for (int i = 0; i < list.size(); i++) {
 27 			System.out.print(list.get(i) + " ");
 28 		}
 29 	}
 30 }
 31