StringBuffer Insert () method and append () method

//stringbuffer Insert () method and append () method
Class
Aa
{
public static void Main (string[]
Args
{
StringBuffer str = new
StringBuffer ("Wlf");
System.out.println (str); Before calling the Insert method result: Wlf
Str.insert (1, "Ang");
System.out.println (str);//After calling the Insert method results: WANGLF
System.out.println ("---------------------------");
Student
Stu = new Student ();//Generate the object for the custom class
System.out.println (Stu);We already know that the Print object will automatically call its ToString () method haha0
//Use the StringBuffer Append method to add an object, in essence: Add the ToString return value of object (that is, the string information) to the StringBuffer tail
Str.append (Stu);
System.out.println (str);//WANGLFHAHA0
}
}
//Custom class
Class Student
{
int age;the default value for the//int type property is 0
Public String
ToString ()
{
return "haha" +age;
}
}

StringBuffer Insert () method and append () method