stringmisc.java

我在学习JAVA的讲义

//  StringMisc.java
// 显示 String类 length, charAt 和 getChars方法.
import javax.swing.*;

public class StringMisc {
   public static void main( String args[] )
   {
      String s1, output;
      char charArray[];

      s1 = new String( "hello there" );
      charArray = new char[ 5 ];

      // 输出字符串
      output = "s1: " + s1;

      // 测试Length方法
      output += "\nLength of s1: " + s1.length();

      // 遍历在S1中的每个字符并且把它们反转显示出来
      output += "\n这个字符串反转是：";

      for ( int i = s1.length() - 1; i >= 0; i-- )
         output += s1.charAt( i ) + " ";

      // 从字符串中拷贝字符进一个字符数组
      s1.getChars( 0, 5, charArray, 0 );
      output += "\n字符数组是: ";

      for ( int i = 0; i < charArray.length;i++ )
         output += charArray[ i ];

      JOptionPane.showMessageDialog( null, output,
         "演示String类的length, charAt和getChars方法",
         JOptionPane.INFORMATION_MESSAGE );

      System.exit( 0 );
   }
}