Do if statements that call methods on an object modify the object?

I'm trying to perform actions on my object, but only do so if certain things are true. I have several methods which is consider "action" methods, they do some action that attempts to modify the object and returns true/false if that action can be done.

Example 1

Thing thing = new Thing();
if (thing.changeSomething()){
    if (thing.shouldDoSomething()){
        //do more things
    }
}

I know about compound boolean expressions like to check if a number in a valid range of values

if(number>0 && number<=10)
    //number is valid

But haven't really done much when the sub-expressions are method calls

Example 2

if ( thing.changeSomething() && (thing.shouldDoSomething() ){
    //do more things
}

Is Example 2 the same as Example 1?
Will Example 2 call the shouldDoSomething() method? Because I don't want this to happen because sometimes shouldDoSomething() actually has other implications & changes other aspects of the object.