boolean example in Schildt book

I'm really new to Java, but it sucks all my free time, it's very interesting to study, but I need a little help.

Here's an example of Boolean test from Schildt's book:

public class BooleanTest {
public static void main(String args[]){
    boolean b;
    b = false;
    System.out.println("Expression b " +b);
    b = true;
    System.out.println("Expression b " + b);
    if (b) System.out.println("This code is ok.");
    b = false;
    if (b) System.out.println("This code is not ok.");
    System.out.println("10 > 9 " + (10>9));
}}

This code shows me result:

Expression b false

Expression b true

This code is ok.

10 > 9 true

First line is ok, second is ok, third too, but why the fourth doesn't show me "The code is not ok.", 'cause there is "b=false" and it should say that? Why it jumps to the last System.out.println?

Can someone add commentaries to this example? Thanks a lot!