Question

I see, that in Java you can build strings with

• MessageFormat and a string like "You said {0} just now"

• StringBuffer and a construct like

  StringBuffer mail = new StringBuffer("Dear ");
  mail.append(user.name);
  mail.append(",\nCongratulations!");
  ....
  

• there may be other good options, string concatenation is not one of them

So, which method should I use? My thoughts are: I have 5-6 standard texts where I have to replace some of the contents dynamically. I think it will be better to have the texts as constants somewhere (class with constants or properties file) and just make the quick replacement when I need it. Otherwise I will have strings in the middle of my source code that may be changed one day, like StringBuffer("Dear ").

Do I have an even better option?

Answer 1

    String str = new StringBuffer().append("Hello").append("World").toString();
    System.out.println(str);

            //print Hello World 

             it contain into package import java.text.MessageFormat;
             "When you using Message format"
              Object[] values = { "123456", "asdfjk" };

    String output = MessageFormat.format("Value 1 equals: {0} and Value 2 equals{1}", values);
    System.out.println(output);
    // prints:
    // The value of value 1 is: 123456 The value of value 2 is: asdfjk