Java

The output: result = 10

Can you explain me the following code?

Why is x.equals(z) false?...

public class WrapTest {

public static void main(String[] args) {

int result = 0;

short s = 42;

Long x = new Long("42");

Long y = new Long(42);

Short z = new Short("42");

Short x2 = new Short(s);

Integer y2 = new Integer("42");

Integer z2 = new Integer(42);

if (x == y) {

result = 1;

}

if (x.equals(y)) {

result = result + 10;

}

if (x.equals(z)) {

result = result + 100;

}

if (x.equals(x2)) {

result = result + 1000;

}

if (x.equals(z2)) {

result = result + 10000;

}

System.out.println("result = " + result);

}

}