实现对字符串的反转输出与句子的反转输出

/**
 * 
 * @author JiaJoa
 * 实现对字符串的反转，对句子单词的反转
 */
public class StringReverse {
   
    public static void main(String[] args){
        String str = "abcdefg";
        System.out.println(StringReverse.strReverse(str));
        
        String sentence = "I am a student.";
        System.out.println(StringReverse.sentenceReverse(sentence));
    }
    
    //字符串的反转输出
    public static String strReverse(String str){
        StringBuffer sb = new StringBuffer(str);
        return sb.reverse().toString();
    }
    
    //句子的反转输出
    public static String sentenceReverse(String sentence){
        String[] strArray = sentence.split("\\s");
        StringBuilder  sb = new StringBuilder();
        for(int i=strArray.length-1;i>=0;i--){
            sb.append(strArray[i]+" ");
        }
        return sb.toString();
    }
}