Java generating Strings with placeholders

Question

I\'m looking for something to achieve the following:

String s = \"hello {}!\";
s = generate(s, new Object[]{ \"world\" });
assertEquals(s, \"hello world!\");         


        

Answer 1

If you can tolerate a different kind of placeholder (i.e. %s in place of {}) you can use String.format method for that:

String s = "hello %s!";
s = String.format(s, "world" );
assertEquals(s, "hello world!"); // true