Java StringBuilder reverse()方法及实例

StringBuilder的 reverse() 方法用于 逆转StringBuilder中的字符。 该方法有助于将该字符序列替换为该序列的反面。

语法

public java.lang.AbstractStringBuilder reverse()

返回： 该方法在反转字符后返回StringBuilder对象。下面的程序说明了java.lang.StringBuilder.reverse()方法：

示例1 :

// Java program to demonstrate// the reverse() Method. class GFG {    public static void main(String[] args)    {         // create a StringBuilder object        // with a String pass as parameter        StringBuilder str            = new StringBuilder("WelcomeGeeks");         // print string        System.out.println("String = "                           + str.toString());         // reverse the string        StringBuilder reverseStr = str.reverse();         // print string        System.out.println("Reverse String = "                           + reverseStr.toString());    }}

输出

String = WelcomeGeeksReverse String = skeeGemocleW

例2 :

// Java program to demonstrate// the reverse() Method. class GFG {    public static void main(String[] args)    {         // create a StringBuilder object        // with a String pass as parameter        StringBuilder str            = new StringBuilder("AAAABBBCCCC");         // print string        System.out.println("String = "                           + str.toString());         // reverse the string        StringBuilder reverseStr = str.reverse();         // print string        System.out.println("Reverse String = "                           + reverseStr.toString());    }}

输出

String = AAAABBBCCCCReverse String = CCCCBBBAAAA

参考文献： https://docs.oracle.com/javase/10/docs/api/java/lang/StringBuilder.html#reverse()