反转String的一种自然方法是使用StringTokenizer和堆栈。Stack是一个实现易于使用的后进先出(LIFO)对象堆栈的类。

String s = "Hello My name is Sufiyan";

把它放在堆栈前面

Stack<String> myStack = new Stack<>();
StringTokenizer st = new StringTokenizer(s);
while (st.hasMoreTokens()) {
     myStack.push(st.nextToken());
}

反向打印堆栈

System.out.print('"' + s + '"' + " backwards by word is:\n\t\"");
while (!myStack.empty()) {
  System.out.print(myStack.pop());
  System.out.print(' ');
}

System.out.println('"');

public static String reverseIt(String source) {
    int i, len = source.length();
    StringBuilder dest = new StringBuilder(len);

    for (i = (len - 1); i >= 0; i--){
        dest.append(source.charAt(i));
    }

    return dest.toString();
}

http://www.java2s.com/Code/Java/Language-Basics/ReverseStringTest.htm

1. 使用字符数组:

public String reverseString(String inputString) {
    char[] inputStringArray = inputString.toCharArray();
    String reverseString = "";
    for (int i = inputStringArray.length - 1; i >= 0; i--) {
        reverseString += inputStringArray[i];
    }
    return reverseString;
}

2. 使用StringBuilder:

public String reverseString(String inputString) {
    StringBuilder stringBuilder = new StringBuilder(inputString);
    stringBuilder = stringBuilder.reverse();
    return stringBuilder.toString();
}

OR

return new StringBuilder(inputString).reverse().toString();

import java.util.Scanner;

public class Test {

    public static void main(String[] args){
        Scanner input = new Scanner (System.in);
        String word = input.next();
        String reverse = "";
        for(int i=word.length()-1; i>=0; i--)
            reverse += word.charAt(i);
        System.out.println(reverse);        
    }
}

如果你想使用一个简单的for循环!

使用charAt()方法

    String name = "gaurav";
    String reversedString = "";
    
    for(int i = name.length()-1; i>=0; i--){
      reversedString = reversedString + name.charAt(i);
    }
    System.out.println(reversedString);

使用toCharArray()方法

String name = "gaurav";
    char [] stringCharArray = name.toCharArray();
    String reversedString = "";
    
    for(int i = stringCharArray.length-1; i>=0; i--) {
      reversedString = reversedString + stringCharArray[i];
    }
    System.out.println(reversedString);

使用Stringbuilder的reverse()方法

    String name = "gaurav";
    
    String reversedString = new StringBuilder(name).reverse().toString();
    
    System.out.println(reversedString);

检查https://coderolls.com/reverse-a-string-in-java/

    public String reverse(String s) {

        String reversedString = "";
        for(int i=s.length(); i>0; i--) {
            reversedString += s.charAt(i-1);
        }   

        return reversedString;
    }