Scjp (310-055) Exam I

Interface Base2 implements Base { }

Abstract class Class2 extends Base { public boolean ml() { return true; } }

Abstract class Class2 implements Base { }

# abstract class Class2. implements Base { public boolean m1() { return (true); } }

Class Class2 implements Base { boolean m1( ) { return false; } byte m2(short s) { return 42; } }

Public abstract class Canine { public Bark speak(); }

Public abstract class Canine { public Bark speak() { } }

Public class Canine { public abstract Bark speak(); }

Public class Canine abstract { public abstract Bark speak(); }

"X extends Y" is correct if and only if X is a class and Y is an interface.

"X extends Y" is correct if and only if X is an interface and Y is a class.

"X extends Y" is correct if X and Y are either both classes or both interfaces.

"X extends Y" is correct for all combinations of X and Y being classes and/or interfaces.

Int $x;

Int 123;

Int _123;

Int #dim;

Int central_sales_region_Summer_2005_gross_sales;

AddSize

GetCust

DeleteRep

IsColorado

PutDimensions

Static void doStuff(int... doArgs) { }

Static void doStuff (int [] doArgs) { }

Static void doStuff(int doArgs...) { }

Static void doStuff(int... doArgs, int y) { }

Static void doStuff(int x, int... doArgs) { }

Has-a relationships always rely on inheritance.

Has-a relationships always rely on instance variables.

Has-a relationships always require at least two class types

Has-a relationships always rely on polymorphism.

Has-a relationships are always tightly coupled.

Flip a Clidlet

Flip a Clidde

Flip a Clidder Flip a Clidlet

# Flip a Clidlet Flip a Clidder

Compilation fails.

Public abstract class Frob implements Frobnicate { public abstract void twiddle(String s){} }

Public abstract class Frob implements Frobnicate { }

Public class Frob extends Frobnicate { public void twiddle(Integer i) { } }

Public class Frob implements Frobnicate { public void twiddle(Integer i) { } }

Public class Frob implements Frobnicate { public void twiddle(String i) { } public void twiddle(Integer s) { } }

BD

DB

BDC

DBC

Compilation fails.

The attributes of the class are all private.

The class refers to a small number of other objects.

The object contains only a small number of variables.

The reference variable is declared for an interface type, not a class. The interface provides a small number of methods.

It is unlikely that changes made to one class will require any changes in another.

Clidlet

Clidder

Clidder Clidlet

Clidlet Clidder

Compilation fails.