Can somebody plz explain this question to me?

what is the output of the program shown below?

public class someclass
{
private int x, y;

public someclass (int xvalue, int yvalue)
{
x = xvalue;
y = yvalue;
}
public void m1()
{
x = 30;
system. out. print((y + 1) + " ");
}
public void m2()
{
m1();
system. out. print(x + " ");
}
}
public class tester
{
public static void main (string[] args)
{
int x = 10;
int y = 20;
someclass z = new someclass(y, x);
z. m2();
z. m1();
}
}

21 10 21
21 30 21
11 30 11
1 10 11
11 30 21