POLYMORPHISM Chapter 9 Inheritances and Interfaces (Java)

1. Assuming the following classes have been defined:

public class First {

public void method2() {

System.out.println("First2");

}

public void method3() {

method2();

}

}

public class Second extends First {

public void method2() {

System.out.println("Second2");

}

}

public class Third extends Second {

public void method1() {

System.out.println("Third1");

super.method2();

}

public void method2() {

System.out.println("Third2");

}

}

public class Fourth extends First {

public void method1() {

System.out.println("Fourth1");

}

public void method2() {

System.out.println("Fourth2");

}

}

And that the following variables have been defined:

First var1 = new Second();

First var2 = new Third();

First var3 = new Fourth();

Second var4 = new Third();

Object var5 = new Fourth();

Object var6 = new Second();

What is the output produced by each statement below? If the statement produces more than one line of output, indicate the line breaks with slashes as in "a/b/c". If the statement causes an error, write either "compiler error" or "runtime error" as appropriate and explain the reason to have an error in a comment line. Comment out any statements that cause a compile or runtime error so that you can run the whole program and please respond with that program in your response as well.

Statement:

var1.method2();

var2.method2();

var3.method2();

var4.method2();

var5.method2();

var6.method2();

var1.method3();

var2.method3();

var3.method3();

var4.method3();

var5.method3();

var6.method3();

((Second)var4).method1();

((Third)var4).method1();

((Second)var5).method2();

((First)var5).method3();

((Third)var5).method1();

((First)var6).method3();

((Second)var6).method1();

((Second)var6).method3();