How to do string formatting with placeholders in Java (like in Python)?

Question

I am new to Java and am from Python. In Python we do string formatting like this:

>>> x = 4
>>> y = 5
>>> print(\"{0} + {1} = {2}\         


        

Answer 1

If you want to use empty placeholders (without positions), you could write a small utility around Message.format(), like this

    void print(String s, Object... var2) {
        int i = 0;
        while(s.contains("{}")) {
            s = s.replaceFirst(Pattern.quote("{}"), "{"+ i++ +"}");
        }
        System.out.println(MessageFormat.format(s, var2));
    }

And then, can use it like,

print("{} + {} = {}", 4, 5, 4 + 5);