Java将字符串反转的7种方法

2024-10-19 09:30:58

/方法1 递归方法

public static String reverse1(String s) {

int length = s.length();

if(length <= 1){

return s;

}

String left = s.substring(0, length / 2);

String right = s.substring(length / 2, length);

return reverse1(right) + reverse1(left);

}

//方法2 通过 charAt(int index)返回char值进行字符串拼接

public static String reverse2(String s) {

int length = s.length();

String reverse = "";

for(int i = 0; i < length; i++)

reverse = s.charAt(i) + reverse;

return reverse;

}

//方法3 把字符串转换成字符数组倒叙拼接然后返回值

public static String reverse3(String s) {

char[] array = s.toCharArray();

String reverse = "";

for(int i = array.length - 1; i >= 0; i--)

reverse += array[i];

return reverse;

}

//方法4 调用StringBuffer中的reverse方法

public static String reverse4(String s) {

return new StringBuffer(s).reverse().toString();

}

//方法5 把字符串转换成字符数组首位对调位置

public static String reverse5(String orig) {

char[] s = orig.toCharArray();

intn = s.length - 1;

int halfLength = n / 2;

for(int i = 0; i <= halfLength; i++) {

chartemp = s[i];

s[i] = s[n - i];

s[n - i] = temp;

}

return new String(s);

}

//方法6

public static String reverse6(String s) {

char[] str = s.toCharArray();

int begin = 0;

int end = s.length() - 1;

while(begin < end) {

str[begin] = (char) (str[begin] ^ str[end]);

str[end] = (char) (str[begin] ^ str[end]);

str[begin] = (char) (str[end] ^ str[begin]);

begin++;

end--; }

return new String(str);

}

//方法7

import java.util.Stack;

public class StringReverse {

public static String reverse7(String s) {

char[] str = s.toCharArray();

Stack<Character> stack = new Stack<Character>();

for (int i = 0; i < str.length; i++)

stack.push(str[i]);

String reversed = "";

for (int i = 0; i < str.length; i++)

reversed += stack.pop();

return reversed;

}

}

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