java:StringBuffer字符处理对象

public class StringBufferDemo {

	public static void main(String args[])
	{
		
		StringBuffer sbf = new StringBuffer();
		sbf.append("hello world");
		fun(sbf);
		for(int i =0; i < 100; i++)
		{
			sbf.append(i);
		}
		
		System.out.println(sbf);
		
	}
	
	public static void fun(StringBuffer b)
	{
		b.append(" ").append("\r\n");
	}
	
	
}

public class StringBufferDemo2 {

	public static void main(String args[])
	{
		StringBuffer sbf = new StringBuffer();
		sbf.append("hello world");
		sbf.insert(1, "-gaga-");
		sbf.insert(0, "/wiki/");
		System.out.println(sbf);
	}
	
}

public class StringBufferDemo3 {

	public static void main(String args[])
	{
		
		StringBuffer sbf = new StringBuffer();
		sbf.append("omganggangstyle");
		sbf.delete(0, 10);
		System.out.println(sbf);
	}
	
}

public class StringBufferDem4 {

	public static void main(String args[])
	{
		StringBuffer sbf = new StringBuffer();
		sbf.append("hello world");
		System.out.println(sbf.reverse());
		
	}
	
}