String Concatenation

The simplest case where we join two Strings.

String s;
s = "Width: " + "10";

Here we join a String with an int. The result is a String.

Note: the first (left-most) value must be a String type.

String s;
s = "Width: " + 10;

We can join many elements.

Note: the first (left-most) value must be a String type.

String s;
s = "Width: " + 10 + " " + "Height: " + 2;

Generally the elements will not be literal/constant values but rather dynamic ones as shown here.

String s;
Rectangle rec = getRec1();
s = "Width: " + rec.getWidth();