j02060409.java

经典java教材《java完美经典》一书中源码的完全收集

import java.lang.*;

class j02060409
{
  public static void main(String para[])
  {
		StringBuffer strbuf1 = new StringBuffer("Fish 大公国");
		System.out.println( "pr1:strbuf1 内含字符串 = " + strbuf1 + "~~"
		   +"\n 目前 strbuf1 之内部缓冲区容量 = " + strbuf1.capacity() );		
		strbuf1.setCharAt(5,'摸');
		strbuf1.setCharAt(6,'鱼');
		strbuf1.setCharAt(7,'堡');
		System.out.println( "pr2:strbuf1 内含字符串 = " + strbuf1 + "~~");
		
		strbuf1.setLength( strbuf1.length()+ 2 );
		System.out.println( "pr3:strbuf1 内含字符串 = " + strbuf1 + "~~");	
		          //两 '\u0000' 字符换行二次，println()本身换行一次
		strbuf1.setCharAt(8,'G');
		strbuf1.setCharAt(9,'O');					
		System.out.println( "pr4:strbuf1 内含字符串 = " + strbuf1 + "~~");
		
		System.out.println( "pr5:strbuf1 内含字符串长度" + strbuf1.length() 
		  +"\n 目前 strbuf1 之内部缓冲区容量 = " + strbuf1.capacity() );
		
		strbuf1.setLength( strbuf1.length()+ 20 );
		System.out.println( "pr6:strbuf1 内含字符串长度" + strbuf1.length() 
		  +"\n 目前 strbuf1 之内部缓冲区容量 = " + strbuf1.capacity() );
			
		strbuf1.ensureCapacity(-10);
		System.out.println( "pr7:目前 strbuf1 之内部缓冲区容量 = " + strbuf1.capacity() );
		strbuf1.ensureCapacity(55);
		System.out.println( "pr8:目前 strbuf1 之内部缓冲区容量 = " + strbuf1.capacity() );
  }
}