Java实现字符串倒序输出的常用方法小结

【Java实现字符串倒序输出的常用方法小结】本文实例汇总了Java实现字符串倒序输出的常用方法,分享给大家供大家参考。具体方法如下:
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。
实现代码如下:
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 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。
实现代码如下:
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 import javax.swing.JOptionPane; public class ReverseString { public static void reverseString (String str){ if (str.length() == 1 ){ System.out.print(str); } else { String subString1 = str.substring( 0 , str.length()- 1 ); String subString2 = str.substring(str.length()- 1 ); System.out.print(subString2); reverseString (subString1); } } public static void main (String args[]){ String originalString; originalString = JOptionPane.showInputDialog( "Please input a String: " ); reverseString (originalString); } }
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。
实现代码如下:
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 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); } }

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