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POInner Class - Order of Print Statements -
 

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    <p>I'm puzzled as to why my program prints statements in a certain order?</p> <p>I have a <code>Student class</code>, inside which is an <code>Inner Class of Address</code>. The idea of the program is to first assign a Home Address to a Student Object, but then also assign a University / Term Time Address by utilizing the Inner Address Class.</p> <p>The code is as follows:</p> <p>Student Class (with Inner Address Class)</p> <pre><code> public class Student { private String name; private Address homeAddress, uniAddress; public Student(String name, int houseNumber, String homeStreet) { this.name = name; homeAddress = new Address(houseNumber, homeStreet); } public String getName() { return name; } public Address getHomeAddress() { String s = "n/a"; if (homeAddress != null) { return homeAddress; } else { // System.out.println(s); return null; } } public void setUniAddress(int num, String add) { uniAddress = new Address(num, add); } public Address getUniAddress() { String s = "n/aa"; //If uniAddress isn't set, // then "n/aa" gets printed before anything else i/e toString() method - WHY? if (uniAddress == null) { System.out.println(s); return null; } else { return uniAddress; } } @Override public String toString() { return "NAME: " + getName() + "\n" + "HOME ADDRESS: " + getHomeAddress() + "\n" + "TERM TIME ADDRESS: " + getUniAddress(); } // Inner Class public class Address { private int number; private String street; public Address(int no, String street) { number = no; this.street = street; } @Override public String toString() { //return name + "\n" + number + " " + street; return number + " " + street; } } } // more Student methods .. } </code></pre> <p>The TestStudent Class (with main method)</p> <pre><code> public class TestStudent { public static void main(String[] args) { //Home Address Student s1 = new Student("Cathy", 21, "Smithfield Drive"); //Uni Address s1.setUniAddress(72, "Nottingham Drive"); Student.Address anotherAddress = s1.new Address(8, "Deerfield Way"); // note the use of new System.out.println(s1.toString()); } } </code></pre> <p>The output is:</p> <pre><code>n/aa NAME: Cathy HOME ADDRESS: 21 Smithfield Drive TERM TIME ADDRESS: null (all on new lines) </code></pre> <p>If I do not assign a Uni Address to the Student (i.e. If I comment out the appropriate line in the main method - that calls the <code>setUniAddress()</code> method), I am curious then, as to why 'n/aa' from the getUniAddress() method is printed before the <code>toString()</code> method? (as above)</p> <p>If I do call the setUniAddress() method the out put is:</p> <pre><code>NAME: Cathy HOME ADDRESS: 21 Smithfield Drive TERM TIME ADDRESS: 72 Nottingham Drive (all on new lines) </code></pre> <p>Which seems to work as intended.</p> <p>I'm also wondering how, instead of printing 'null' to the <em>TERM TIME ADDRESS</em>: (when <code>setUniAddress()</code> method isn't called), I could return the 'n/aa' in it's place - that is what I was attempting to do?</p> <p>Thanks.</p>
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    1. COIs this even valid code? `String homeStreet; homeAddress = new Address(houseNumber, homeStreet);` It looks odd to me.
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    2. COIt's all new to me, it's the first time I'm experimenting with Inner Classes
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    3. CO@bbalchev it's not nice to write two statements on the same line but it's perfectly valid. That said, I can't find anything like that in the code the OP posted.
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