Java中StringBuffer的截取功能(substring)!

/*

• StringBuffer 截取功能：注意返回值类型不再是StringBuffer本身了

•  public String substring(int start)
  

•  public String substring(int start,int end)
  

• */

public class StringBufferDemo {
	public static void main(String[] args) {
		//创建字符串缓冲区对象
		StringBuffer sb = new StringBuffer();
		("hello").append("world").append("java");
		("sb:"+sb);
		
		//截取功能：public String substring(int start)
		String s = (5);
		("s:"+s);
		("sb:"+sb);
		
		//public String substring(int start,int end)
		String ss = (5, 10);
		("ss:"+ss);
		("sb:"+sb);
	}
}

控制台输出结果：
sb:helloworldjava
s:worldjava
sb:helloworldjava
ss:world
sb:helloworldjava