alueOf(array));
return String.valueOf(array);
}
private void display(String input, String output) {
System.out.println(" input string :: " + input);
System.out.println(" output string :: " + output);
}
}
输出：
input string :: javaguides
output string :: sediugavaj
5. 使用 XOR(^) 操作符反转
package net.javaguides.corejava.string;
/**
*
* @author Ramesh Fadatare
*
*/
public class ReverseStringWithXOR {
public static void main(String[] args) {
ReverseStringWithXOR stringWithXOR = new ReverseStringWithXOR();
stringWithXOR.reverseWithXOR("javaguides");
}
public String reverseWithXOR(String string) {
final char[] array = string.toCharArray();
final int length = array.length;
final int half = (int) Math.floor(array.length / 2);
for (int i = 0; i < half; i++) {
array[i] ^= array[length - i - 1];
array[length - i - 1] ^= array[i];
array[i] ^= array[length - i - 1];
}
display(string, String.valueOf(array));
return String.valueOf(array);
}
private void display(String input, String output) {
System.out.println(" input string :: " + input);
System.out.println(" output string :: " + output);
}
}
输出：
input string :: javaguides
output string :: sediugavaj
6. 使用堆栈
package net.javaguides.corejava.string;
import java.util.Stack;
/**
*
* @author Ramesh Fadatare
*
*/
public class ReverseStringUsingStack {
// Function to reverse a string in Java using a stack and character array
public static String reverse(String str) {
// base case: if string is null or empty
if (str == null || str.equals(""))
return str;
// create an empty stack of characters
Stack < Character > stack = new Stack < Character > ();
// push every character of the given string into the stack
char[] ch = str.toCharArray();
for (int i = 0; i < str.length(); i++)
stack.push(ch[i]);
// start from index 0
int k = 0;
// pop characters from the stack until it is empty
while (!stack.isEmpty()) {
// assign each popped character back to the character array
ch[k++] = stack.pop();
}
// convert the character array into string and return it
return String.copyValueOf(ch);
}
public static void main(String[] args) {
String str = "javaguides";
str = reverse(str); // string is immutable
System.out.println("Reverse of the given string is : " + str);
}
}
输出：
Reverse of the given string is : sediugavaj
7. 使用 Collections reverse() 方法
package net.javaguides.corejava.string;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
*
* @author Ramesh Fadatare
*
*/
public class ReverseStringUsingCollectionsReverseMethod {
// Function to reverse a string in Java using Collections.reverse()
public static String reverse(String str) {
// base case: if string is null or empty
if (str == null || str.equals(""))
return str;
// create an empty list of characters
List < Character > list = new ArrayList < Character > ();
// push every character of the given string into it
for (char c: str.toCharArray())
list.add(c);
// reverse list using java.util.Collections reverse()
Collections.reverse(list);
// covert ArrayList into String using StringBuilder and return it
StringBuilder builder = new StringBuilder(list.size());
for (Character c: list)
builder.append(c);