Homework 5 1: class A { 2: public A () { 3: System.out.println( “A’s no-arg constructor is invoked” ); 4: } 5: } 6: 7:

Homework 5 1: class A { 2: public A () { 3: System.out.println( “A’s no-arg constructor is invoked” ); 4: } 5: } 6: 7: class B extends A { 8: } 9: 10: public class C { 11: public static void main ( String [] args ) { 12: B b = new B(); 13: } 14: } 1: class A { 2: public A ( int x ) { 3: } 4: } 5: 6: class B extends A { 7: public B () { 8: } 9: } 10: 11: public class C { 12: public static void main ( String [] args ) { 13: B b = new B(); 14: } 15: } subclass is a subset of a superclass. When invoking a constructor from a subcass, its superclass’s no-arg constructor is always invoked. You can override a private method defined in a superclass. You can override a static method defined in a superclass. 1: public class Test { 2: public static void main ( String [] args ) { 3: A a = new A( 3 ); 4: } 5: } 6: 7: class A extends B { 8: public A ( int t ) { 9: System.out.println( “A’s constructor is invoked” ); 10: } 11: } 12: 13: class B { 14: public B () { 15: System.out.println( “B’s constructor is invoked” ); 16: } 17: } 1: public class Test { 2: public static void main ( String [] args ) { 3: Object fruit = new Fruit(); 4: Object apple = (Apple) fruit; 5: } 6: } 7: 8: class Apple extends Fruit { 9: } 10: 11: class Fruit { 12: } 1: public class Test { 2: public static void main ( String [] args ) { 3: Object circle1 = new Circle(); 4: Object circle2 = new Circle(); 5: System.out.println( circle1.equals( circle2 ) ); 6: } 7: } 1: class Circle { 2: double radius; 3: public boolean equals ( Circle circle ) { 4: return this.radius == circle.radius; 5: } 6: } 1: class Circle { 2: double radius; 3: public boolean equals ( Object circle ) { 4: return this.radius == ((Circle) circle).radius; 5: } 6: } Next, try adding the “@Override” annotation to the equals method in (a), and then try compiling. Repeat with (b). What are the results, and are they as you expected? A 1: class A { 2: abstract void unfinished ( ) { 3: } 4: } B 1: public class abstract A { 2: abstract void unfinished ( ) { 3: } 4: } C 1: class A { 2: abstract void unfinished ( ) ; 3: } D 1: abstract class A { 2: protected void unfinished ( ) ; 3: } E 1: abstract class A { 2: abstract void unfinished ( ) ; 3: } F 1: class A { 2: abstract int unfinished ( ) ; 3: } A 1: interface A { 2: void print () { 3: }; 4: } B 1: abstract interface A extends I1, I2 { 2: abstract void print () { 3: }; 4: } C 1: abstract interface A { 2: print () ; 3: } D 1: interface A { 2: void print () ; 3: } Create an ArrayList for storing double values? Append an object to a List? Insert an object at the beginning of a List? Find the number of objects in a List? Remove a given object from a List? Remove the last object from a List? Check whether a given object is in a List? Retrieve an object at a specified index from a List? 1: ArrayList list = new ArrayList(); 2: list.add( “Denver” ); 3: list.add( “Austin” ); 4: list.add( new java.util.Date() ); 5: String city = list.get( 0 ); 6: list.set( 3, “Dallas” ); 7: System.out.println( list.get(3) ); . 1: for ( int i = 0; i < list.size(); i++ ) 2: list.remove( element ); 1: ArrayList list = new ArrayList(); 2: list.add(1); 3: list.add(2); 4: list.add(3); 5: list.remove(1); 6: System.out.println( list );

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