This is the 19th day of my participation in the August More Text Challenge

Difficulty level: Difficult

The program

Program a

1) What is the output of the following program?

public class Outer
{
	public static int temp1 = 1;
	private static int temp2 = 2;
	public int temp3 = 3;
	private int temp4 = 4;
	
	public static class Inner
	{
		private static int temp5 = 5;
		
		private static int getSum(a)
		{
			return(temp1 + temp2 + temp3 + temp4 + temp5); }}public static void main(String[] args)
	{
		Outer.Inner obj = newOuter.Inner(); System.out.println(obj.getSum()); }}Copy the code

A) 15 B) 9 C) 5 D) 15

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Program 2

2) What is the output of the following program?

public class Outer
{
	private static int data = 10;
	private static int LocalClass(a)
	{
		class Inner
		{
			public int data = 20;
			private int getData(a)
			{
				returndata; }}; Inner inner =new Inner();
		return inner.getData();
	}
	
	public static void main(String[] args)
	{ System.out.println(data * LocalClass()); }}Copy the code

A) compile error b) runtime error C) 200 d) None of the above

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Application of three

3) What is the output of the following program?

interface Anonymous
{
	public int getValue(a);
}
public class Outer
{
	private int data = 15;
	public static void main(String[] args)
	{
		Anonymous inner = new Anonymous()
				{
					int data = 5;
					public int getValue(a)
					{
						return data;
					}
					public int getData(a)
					{
						returndata; }}; Outer outer =newOuter(); System.out.println(inner.getValue() + inner.getData() + outer.data); }}Copy the code

A) 25 B) compilation error C) 20 d) runtime error

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Application of four

4) What is the output of the following program?

public class Outer
{
	private int data = 10;
	
	class Inner
	{
		private int data = 20;
		private int getData(a)
		{
			return data;
		}
		public void main(String[] args)
		{
			Inner inner = newInner(); System.out.println(inner.getData()); }}private int getData(a)
	{
		return data;
	}
	public static void main(String[] args)
	{
		Outer outer = new Outer();
		Outer.Inner inner = outer.new Inner(a);
		System.out.printf("%d", outer.getData()); inner.main(args); }}Copy the code

A) 2010 B) 1020 C) compilation error D) none of these

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Application of five

5) What is the output of the following program?

interface OuterInterface
{
	public void InnerMethod(a);
	public interface InnerInterface
	{
		public void InnerMethod(a); }}public class Outer implements OuterInterface.InnerInterface.OuterInterface
{
	public void InnerMethod(a)
	{
		System.out.println(100);
	}
	
	
	public static void main(String[] args)
	{
		Outer obj = newOuter(); obj.InnerMethod(); }}Copy the code

A) 100 b) compile error C) runtime error d) none of the above

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The second part is the output and analysis of the program

Output and parsing

Program one output

The answer:

(d)Copy the code

Description:

A static inner class cannot access the non-static fields of an external class.

Program two output

The answer:

(C)Copy the code

Description:

The LocalClass() method defines a local inner class. This method creates an object of class Inner and returns the value of the variable data residing in it.

Program three output

The answer:

(b)
Copy the code

Description:

The method getData() is not defined in the Anonymous class, resulting in a compilation error.

Procedure 4 Answer

Answer:

(b)
Copy the code

Description:

The inner class defined above can access the private variable data of the outer class, but declaring variable data in the inner class makes it specific to the inner class, and there is no conflict in variable declaration.

Procedure 5 Answer

Answer:

(a)
Copy the code

Description:

Nested interfaces are defined in Java. Since both interfaces have a declaration of InnerMethod(), implementing it once applies to both the InnerInterface and OuterInterface.

That’s all for this article

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