1. 最容易想到的估计就是利用String类的toCharArray()，再倒序输出数组的方法了。
import javax.swing.JOptionPane;
public class ReverseString {
public static void main (String args[]){
String originalString;
String resultString = "";
originalString = JOptionPane.showInputDialog("Please input a String: ");
char[] charArray = originalString.toCharArray();
for (int i=charArray.length-1; i>=0; i--){
resultString += charArray[i];
}
JOptionPane.showMessageDialog(null, resultString, "Reverse String", JOptionPane.INFORMATION_MESSAGE);
}
}
2. 还可以利用String类提供的subString()方法，利用递归的办法输出倒序字符串。
3. 还有就是不把字符串定义为String类，而是定义成一个StringBuffer类，用StringBuffer类中的reverse()方法直接倒序字符串。
import javax.swing.JOptionPane;
public class ReverseString {
public static void reverseString (String str){
StringBuffer stringBuffer = new StringBuffer (str);
System.out.print(stringBuffer.reverse());
}
public static void main (String args[]){
String originalString;
originalString = JOptionPane.showInputDialog("Please input a String: ");
reverseString (originalString);
}
}