I have a class like this:
private static class Num {
private int val;
public Num(int val) {
this.val = val;
}
}
Is it possible to add to objects of the class by using the "+"-operator?
Num a = new Num(18);
Num b = new Num(26);
Num c = a + b;
|, Bitwise OR operator: returns bit by bit OR of input values. ^, Bitwise XOR operator: returns bit-by-bit XOR of input values. ~, Bitwise Complement Operator: This is a unary operator which returns the one's complement representation of the input value, i.e., with all bits inverted.
No, you can't. +
is overloaded only for numbers, chars and String
, and you are not allowed to define any additional overloadings.
There is one special case, when you can concatenate any objects' string representation - if there is a String
object in the first two operands, toString()
is called on all other objects.
Here's an illustration:
int i = 0;
String s = "s";
Object o = new Object();
Foo foo = new Foo();
int r = i + i; // allowed
char c = 'c' + 'c'; // allowed
String s2 = s + s; // allowed
Object o2 = o + o; // NOT allowed
Foo foo = foo + foo; // NOT allowed
String s3 = s + o; // allowed, invokes o.toString() and uses StringBuilder
String s4 = s + o + foo; // allowed
String s5 = o + foo; // NOT allowed - there's no string operand
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