字符串反转

以下为字符串反转的几种方法

遍历字符数组

public static void reverse3(String src){
    if(src==null){
        throw new IllegalArgumentException(src);
    }
    int length=src.length();
    char[] srcChar=src.toCharArray();
    for(int i=0;i<length/2;i++){
        char temp=srcChar[i];
        srcChar[i]=srcChar[length-i-1];
        srcChar[length-i-1]=temp;
    }
    System.out.println(new String(srcChar));
}



public static void reverse1(String src){
    if(src==null){
        throw new IllegalArgumentException(src);
    }
    int length=src.length();
    char[] dest=new char[length];
    char[] srcChar=src.toCharArray();
    for(int i=0;i<length;i++){
        dest[i]=srcChar[length-i-1];
    }
    System.out.println(new String(dest));
}

递归

public static String reverse4(String src){
       if(src==null){
           throw new IllegalArgumentException(src);
       }
       int length=src.length();
       if(length<=1){
           return src;
       }
       String left=src.substring(0,length/2);
       String right=src.substring(length/2,length);
       return reverse4(right)+reverse4(left);

   }

使用StringBuffer

public static void reverse2(String src){
       if(src==null){
           throw new IllegalArgumentException(src);
       }
       StringBuffer sb=new StringBuffer(src);
       sb.reverse();
       System.out.println(sb.toString());
   }