在这篇文章中，我们会讨论10种用Java反转字符串的方法，通过10个Java程序反转字符串。例如，把字符串“javaguides” 反转为 “sediugavaj”。 1. 使用 + (String连接) 操作符 package net.javaguides.corejava.string; /** * * @author Ramesh Fadatare * */ public class ReverseWithStringConcat { public static void main(String[] args) { ReverseWithStringConcat concat = new ReverseWithStringConcat(); concat.reverseWithStringConcat(“javaguides”); } private String reverseWithStringConcat(String input) { String output = new String(); for (int i = (input.length() – 1); i >= 0; i–) { output += (input.charAt(i)); } display(input, output); return output; } 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 2. 使用 StringBuilder package net.javaguides.corejava.string; /** * * @author Ramesh Fadatare * */ public class ReverseWithStringBuilderBuiltinMethod { public static void main(String[] args) { ReverseWithStringBuilderBuiltinMethod builtinMethod = new ReverseWithStringBuilderBuiltinMethod(); builtinMethod.reverseWithStringBuilderBuiltinMethod(“javaguides”); } public String reverseWithStringBuilderBuiltinMethod(String string) { final StringBuilder builder = new StringBuilder(string); display(string, builder.reverse().toString()); return builder.reverse().toString(); } private void display(String input, String output) { System.out.println(” input string :: ” + input); System.out.println(” output string :: ” + output); } } 输出：对Java技术，架构技术感兴趣的同学，欢迎加Q君羊：625241190，一起学习，相互讨论。 input string :: javaguides output string :: sediugavaj 3. 使用 String charAt 方法 package net.javaguides.corejava.string; /** * * @author Ramesh Fadatare * */ public class ReverseWithStringChatAt{ public static void main(String[] args) { ReverseWithStringChatAt reverseWithStringBuilder = new ReverseWithStringChatAt(); reverseWithStringBuilder.reverseWithStringBuilder(“javaguides”); } public String reverseWithStringChatAt(String string) { final StringBuilder builder = new StringBuilder(); for (int i = (string.length() – 1); i >= 0; i–) { builder.append(string.charAt(i)); } display(string, builder.toString()); return builder.toString(); } 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 4. 通过交换字符反转 package net.javaguides.corejava.string; /** * * @author Ramesh Fadatare * */ public class ReverseStringWithSwaps { public static void main(String[] args) { ReverseStringWithSwaps stringWithSwaps = new ReverseStringWithSwaps(); stringWithSwaps.reverseWithSwaps(“javaguides”); } public String reverseWithSwaps(String string) { final char[] array = string.toCharArray(); final int length = array.length – 1; final int half = (int) Math.floor(array.length / 2); char c; for (int i = length; i >= half; i–) { c = array[length – i]; array[length – i] = array[i]; array[i] = c; } 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 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); return builder.toString(); } public static void main(String[] args) { String str = “Java Guides”; // String is immutable str = reverse(str); System.out.println(“Reverse of the given string is : ” + str); } } 输出： Reverse of the given string is : sediuG avaJ 8. 使用 Byte 数组 package net.javaguides.corejava.string; /** * * @author Ramesh Fadatare * */ public class ReverseStringUsingByteArray { // Function to reverse a string in Java using byte array public static String reverse(String str) { // return if string is null or empty if (str == null || str.equals(“”)) return str; // convert string into bytes byte[] bytes = str.getBytes(); // start from the two end points l and h of the given string // and increment l & decrement h at each iteration of the loop // until two end-points intersect (l >= h) for (int l = 0, h = str.length() – 1; l < h; l++, h–) { // Swap values at l and h byte temp = bytes[l]; bytes[l] = bytes[h]; bytes[h] = temp; } // convert byte array back into the string return new String(bytes); } public static void main(String[] args) { String str = “Java Guides”; // String is immutable str = reverse(str); System.out.println(“Reverse of the given string is : ” + str); } } 输出： Reverse of the given string is : sediuG avaJ 9. 使用 substring() 方法 package net.javaguides.corejava.string; /** * * @author Ramesh Fadatare * */ public class UsingSubStringFunction { // Function to reverse a string in Java using recursion private static String reverse(String str) { // base case: if string is null or empty if (str == null || str.equals(“”)) return str; // last character + recurse for remaining string return str.charAt(str.length() – 1) + reverse(str.substring(0, str.length() – 1)); } public static void main(String[] args) { String str = “javaguides”; // string is immutable str = reverse(str); System.out.println(“Reverse of the given string is : ” + str); } } 输出： Reverse of the given string is : sediugavaj 10. 使用递归 package net.javaguides.corejava.string; /** * * @author Ramesh Fadatare * */ public class UsingRecursion { static int i = 0; // Recursive function to reverse a string in Java using static variable private static void reverse(char[] str, int k) { // if we have reached the end of the string if (k == str.length) return; // recurse for next character reverse(str, k + 1); if (i <= k) { char temp = str[k]; str[k] = str[i]; str[i++] = temp; } } public static String reverse(String str) { // base case: if string is null or empty if (str == null || str.equals(“”)) return str; // convert string into a character array char[] A = str.toCharArray(); // reverse character array reverse(A, 0); // convert character array into the string return String.copyValueOf(A); } public static void main(String[] args) { String str = “Java Guides”; // string is immutable str = reverse(str); System.out.println(“Reverse of the given string is : ” + str); } } 输出： Reverse of the given string is : sediuG avaJ
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