StringBuffer append(String str), StringBuffer append(Object obj) : StringBuffer « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. StringBuffer

public class MainClass{
  public static void main(String[] argv){
    StringBuffer sb = new StringBuffer();
    sb.append("aaa");
    MyClass my = new MyClass();
    sb.append(my);
    System.out.println(sb);
  }
}
    
class MyClass{
    public String toString(){
        return "MyClass";
    }

}

aaaMyClass