java回文代码

直接比较前后字符是否相等

public boolean isHuiWen(String in){
		int end = in.length()-1;
		int start=0;
		while(start<end){
		if(String.valueOf(in.charAt(start)).equals(String.valueOf(in.charAt(end)))
				){
			start++;
			end--;
		}else{
			return false;
		}
		}
			
		return true;
	}

反转比较，好像很偷懒呀；呵呵

public boolean isHuiWen2(String in){
		StringBuffer out = new StringBuffer(in);
		String end =out.reverse().toString();
		if(in.equals(end)){
			return true;
		}else{
			return false;
		}
		
	}

迭代

	public boolean isHuiWen3(String in){
		boolean flag =true;
		System.out.println(in.substring(0,1));
		System.out.println(in.substring(in.length()-1,in.length()));
		if(in.substring(0,1).equals(in.substring(in.length()-1,in.length()))
				&&in.length()>1){//长度需要加上，否则数组越界
			this.isHuiWen3(in.substring(1,in.length()-1));
		}else{
			flag=false;
		}
		return flag;
	}