Given the 2 toString()
implementations below, which one is preferred:
public String toString(){
return "{a:"+ a + ", b:" + b + ", c: " + c +"}";
}
or
public String toString(){
StringBuilder sb = new StringBuilder(100);
return sb.append("{a:").append(a)
.append(", b:").append(b)
.append(", c:").append(c)
.append("}")
.toString();
}
?
More importantly, given we have only 3 properties it might not make a difference, but at what point would you switch from +
concat to StringBuilder
?
Version 1 is preferable because it is shorter and the compiler will in fact turn it into version 2 - no performance difference whatsoever.
More importantly given we have only 3 properties it might not make a difference, but at what point do you switch from concat to builder?
At the point where you're concatenating in a loop - that's usually when the compiler can't substitute StringBuilder
by itself.