e4_15.java

来自「java 初学者学习实例」· Java 代码 · 共 55 行

// Fig. 11.8: StringMiscellaneous2.java
// String methods replace, toLowerCase, toUpperCase, trim and toCharArray.
import javax.swing.*;
//StringMiscellaneous2
public class  E4_15{

   public static void main( String args[] )
   {
      String s1 = new String( "hello" );
      String s2 = new String( "GOODBYE" );
      String s3 = new String( "   spaces   " );

      String output = "s1 = " + s1 + "\ns2 = " + s2 + "\ns3 = " + s3;

      // test method replace      
      output += "\n\nReplace 'l' with 'L' in s1: " +
         s1.replace( 'l', 'L' );

      // test toLowerCase and toUpperCase
      output += "\n\ns1.toUpperCase() = " + s1.toUpperCase() +
         "\ns2.toLowerCase() = " + s2.toLowerCase();

      // test trim method
      output += "\n\ns3 after trim = \"" + s3.trim() + "\"";

      // test toCharArray method
      char charArray[] = s1.toCharArray();
      output += "\n\ns1 as a character array = ";

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

      JOptionPane.showMessageDialog( null, output,
         "Additional String methods", JOptionPane.INFORMATION_MESSAGE );

      System.exit( 0 );
   }

} // end class StringMiscellaneous2

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