capacity.java

JAVA 2应用开发指南

//capacity.Java
import javax.swing.*;    
    public class capacity {    
      // test StringBuffer methods for capacity and length
      public static void main( String args[] )
      {
         StringBuffer buffer = new StringBuffer( "Hello, how are you?" );   
         String output = "buffer = " + buffer.toString() +
            "\nlength = " + buffer.length() + "\ncapacity = " + buffer.capacity();   
         buffer.ensureCapacity( 69 );
         output += "\n\nNew capacity = " + buffer.capacity();   
         buffer.setLength( 10 );
         output += "\n\nNew length = " + buffer.length() +
            "\nbuf = " + buffer.toString();   
         JOptionPane.showMessageDialog( null, output,
            "StringBuffer length and capacity Methods",
            JOptionPane.INFORMATION_MESSAGE );   
         System.exit( 0 );
      }
   }