In the following code, the effect of exchanging two objects is not achieved
The output result is 3:4
Logically speaking, aren't all references in Java? You should be able to exchange objects directly!
Please explain my error and give a solution.
I hope the output result is 4:3
class Int
{

public int x;

}

public class Hello {

void swap(Int a,Int b)
{
    Int t=a;
    a=b;
    b=t;
}
public static void main(String[] args) {
    
    Hello hello=new Hello();
    Int a=new Int();
    Int b=new Int();
    a.x=3;
    b.x=4;
    hello.swap(a,b);
    System.out.println(a.x+":"+b.x);
}

}