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Java Quiz: Nested Classes

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Java Quiz: Nested Classes

What happens when you try to compile and run the following program?

· Java Zone
Free Resource

Learn how to troubleshoot and diagnose some of the most common performance issues in Java today. Brought to you in partnership with AppDynamics.

Starting today, every week, we'll be bringing you a new quiz/puzzler/brain-teaser to help keep you on top of your Java game. Here's your first question: 

What Happens When You Try to Compile and Run the Following Program?

class Outer {

    private int a = 12;
    private int b = 6;

    Outer() {

        NestedA nestedA = new NestedA(4);
        a = a -12;
    class NestedA {

        NestedA(int y){

            NestedB nestedB = new NestedB(y);
            nestedB.methodB(y, a);
            a= a + b - y;
        private void methodA(int z) {

        class NestedB {

            NestedB(int i) {
                a = a - i; b = b +i;
            private void methodB(int x, int z) {
                if(x < 5) {
                    a = a+x+b;
                b = b+z; 
    public static void main(String[] args) {

        NestedA nestedA = new Outer().new NestedA(2);

Submit your answer here (no compiling!):

Was this too difficult? Too easy? What other topics would you like to see Sar test you on? Let us know your thoughts in the comments!

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