stringbufferinsert.java

《Java面向对象程序设计》例子源代码.轻松学习书本.

//StringBufferInsert.java
import javax.swing.*;
public class StringBufferInsert {
   public static void main( String args[] ){
      Object objectRef = "hello";  
      String string = "goodbye";  
      char charArray[] = { 'a', 'b', 'c', 'd', 'e', 'f' };
      boolean booleanValue = true;
      char characterValue = 'K';
      int integerValue = 7;
      long longValue = 10000000;
      float floatValue = 2.5f;  
      double doubleValue = 33.333;
      StringBuffer buffer = new StringBuffer();
      buffer.insert( 0, objectRef );			//插入Object类型的值
      buffer.insert( 0, "  " );  				//插入两个空格作为分割
      buffer.insert( 0, string );				//插入String类型的值
      buffer.insert( 0, "  " );
      buffer.insert( 0, charArray );			//插入字符数组类型的值
      buffer.insert( 0, "  " );
      buffer.insert( 0, charArray, 3, 3 );		//插入字符数组中的子字符串
      buffer.insert( 0, "  " );
      buffer.insert( 0, booleanValue );			//插入boolean类型的值
      buffer.insert( 0, "  " );
      buffer.insert( 0, characterValue );		//插入char类型的值
      buffer.insert( 0, "  " );
      buffer.insert( 0, integerValue );			//插入int类型的值
      buffer.insert( 0, "  " );
      buffer.insert( 0, longValue );			//插入long类型的值
      buffer.insert( 0, "  " );
      buffer.insert( 0, floatValue );			//插入float类型的值
      buffer.insert( 0, "  " );
      buffer.insert( 0, doubleValue );			//插入double类型的值
      String output = "buffer after inserts:\n" + buffer.toString();
      buffer.deleteCharAt( 10 );  			// 删除2.5中的5
      buffer.delete( 2, 6 );      			// 删除33.333中的.333
      output += "\n\nbuffer after deletes:\n" + buffer.toString();
      JOptionPane.showMessageDialog( null, output,
         " StringBuffer类的插入和删除方法使用", 												JOptionPane.INFORMATION_MESSAGE );
      System.exit( 0 );
   }
}