StringBuffer sb = new StringBuffer();
sb.append("q").append("w");
sb.delete(0, sb.length());
sb.append("e");
System.out.println("sb = " + sb.toString());
sb = e
作者:鲨鱼辣椒灬
来源:优快云
StringBuffer sb = new StringBuffer();
sb.append("q").append("w");
sb.delete(0, sb.length());
sb.append("e");
System.out.println("sb = " + sb.toString());
sb = e
作者:鲨鱼辣椒灬
来源:优快云