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The Java Interview Handbook: 300+ Interview Questions

<div class="card">
   # Question # 1
    <div class="qtn">
        <p>What are nested classes?</p>
    </div>
    <div class="ans"><p><span class="hi-yl-b">Java allows defining a class within another class. A nested class is a member of its enclosing class. Nested classes can be either static or non-static.</span></p>
<p><ul>
<li>Static Nested Class</li>
<li> Non-Static Nested Class or Inner Class. The following classes are also considered inner classes.
<ul style="margin-top:0.1em">
<li>Local Class
</li>
<li>Anonymous Class
</li>
</ul></li>
</ul></p><p>The below code snippet shows an outer class declaring a static and a non-static nested class.</p>
## Static and Non-static Nested Classes
<b>

```java
public class OuterClass {

    String myName = "outerclass";
    private static String staticName = "outerclass";

    private class InnerClass {

        String myName = "innerClass";

        void printNames() {
            System.out.println(
                    "I can access both static & non-static members of my outer class : " + staticName + " " + myName);
        }
    }

    void createInnerClassInstance() {
        // Creating inner class instance
        InnerClass ic = new InnerClass();
        ic.printNames();
    }

    static class StaticInnerClass {

        String myName = "staticInnerClass";

        void printName() {
            System.out.println("I can access static members of my outerclass but not non-static ones: " + staticName);
        }
    }
}
```
</b>
<p>The above snippet can be executed in the code widget below.</p>
</div>
</div>

<div>
   # Question # 1
    <div>
        <p>What are nested classes?</p>
    </div>
    <div><p><span>Java allows defining a class within another class. A nested class is a member of its enclosing class. Nested classes can be either static or non-static.</span></p>
<p><ul>
<li>Static Nested Class</li>
<li> Non-Static Nested Class or Inner Class. The following classes are also considered inner classes.
<ul>
<li>Local Class
</li>
<li>Anonymous Class
</li>
</ul></li>
</ul></p><p>The below code snippet shows an outer class declaring a static and a non-static nested class.</p>
## Static and Non-static Nested Classes
<b>

```java
public class OuterClass {

    String myName = "outerclass";
    private static String staticName = "outerclass";

    private class InnerClass {

        String myName = "innerClass";

        void printNames() {
            System.out.println(
                    "I can access both static & non-static members of my outer class : " + staticName + " " + myName);
        }
    }

    void createInnerClassInstance() {
        // Creating inner class instance
        InnerClass ic = new InnerClass();
        ic.printNames();
    }

    static class StaticInnerClass {

        String myName = "staticInnerClass";

        void printName() {
            System.out.println("I can access static members of my outerclass but not non-static ones: " + staticName);
        }
    }
}
```
</b>
<p>The above snippet can be executed in the code widget below.</p>
</div>
</div>

This lesson explains nested classes in Java.

Java Ecosystem

Methods

Classes

Interfaces

Inheritance

Lambda Expressions

Generics

Multi-Threading

Memory Management

Collections

Exceptions

Reflection

Serialization

Miscellaneous Topics

Java in Practice

Patterns

The End

Nested Classes

Question # 1

Static and Non-static Nested Classes