Java 演示String类的长度，charAt和getChars方法。

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public class Main 

/**来自 

 时 代 J a v a 公 众 号 - N o w J a v  a . c o m**/

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{

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   public static void main(String[] args)

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   {

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      String s1 = "hello there";

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      char[] charArray = new char[5];

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      System.out.printf("s1: %s", s1);

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      // test length method

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      System.out.printf("\nLength of s1: %d", s1.length());

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      // loop through characters in s1 with charAt and display reversed

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      System.out.printf("%nThe string reversed is: ");/** 来 自 时 代 J a v a**/

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      for (int count = s1.length() - 1; count >= 0; count--)

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         System.out.printf("%c ", s1.charAt(count));

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      // copy characters from string into charArray

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      s1.getChars(0, 5, charArray, 0);

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