[PDF] [PDF] Advanced Java Programming

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Where it makes sense, the same example will be presented using Java 7 syntax as well as Java 8 one 1 2 Instance Construction Java is object-oriented 

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It will automatically be called whenever a reference to an object is passed as a parameter is passed to the “print/println” method •Location of the online example: - / 

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CPSC 219: Advanced Java

James Tam

Advanced Java Programming

After mastering the basics of Java you

will now learn more complex but important programming concepts as implemented in Java.

James Tam

Commonly Implemented Methods

•The particular methods implemented for a class will vary depending upon the application. •However two methods that are commonly implemented for many classes: -toString -equals

CPSC 219: Advanced Java

James Tam

"Method: toString" •It's commonly written to allow easy determination of the state of a particular object (contents of important attributes). •This method returns a string representation of the state of an object. •It will automatically be called whenever a reference to an object is passed as a parameter is passed to the " print/println" method. •Location of the online example: -/home/219/examples/advanced/toStringExample -www.cpsc.ucalgary.ca/~tamj/219/examples/advanced/toStringExample

James Tam

Class Person: Version 1

public class Person private String name; private int age; public Person () {name = "No name"; age = -1; } public void setName (String aName) { name = aName; } public String getName () { return name; } public void setAge (int anAge) { age = anAge; } public int getAge () { return age; }

CPSC 219: Advanced Java

James Tam

Class Person: Version 2

public class Person2 private String name; private int age; public Person2 () {name = "No name"; age = -1; } public void setName (String aName) { name = aName; } public String getName () { return name; } public void setAge (int anAge) { age = anAge; } public int getAge () { return age; } public String toString ()

String temp = "";

temp = temp + "Name: "+ name + "\n"; temp = temp + "Age: " + age + "\n"; return temp;

James Tam

The Driver Class

class Driver public static void main (String args [])

Person p1 = new Person ();

Person2 p2 = new Person2 ();

System.out.println(p1);

System.out.println(p2);

CPSC 219: Advanced Java

James Tam

"Method: equals" •It's written in order to determine if two objects of the same class are in the same state (attributes have the same data values). •Location of the online example: -/home/219/examples/advanced/equalsExample -www.cpsc.ucalgary.ca/~tamj/219/examples/advanced/equalsExample

James Tam

The Driver Class

public class Driver public static void main (String args [])

Person p1 = new Person ();

Person p2 = new Person ();

if (p1.equals(p2) == true)

System.out.println ("Same");

else

System.out.println ("Different");

p1.setName ("Foo"); if (p1.equals(p2) == true)

System.out.println ("Same");

else

System.out.println ("Different");

CPSC 219: Advanced Java

James Tam

The Person Class

public class Person private String name; private int age; public Person () {name = "No name"; age = -1; } public void setName (String aName) { name = aName; } public String getName () { return name; } public void setAge (int anAge) { age = anAge; } public int getAge () { return age; } public boolean equals (Person aPerson) boolean flag; if ((name.equals(aPerson.getName())) && (age == aPerson.getAge ())) flag = true; else flag = false; return flag;

James Tam

Methods Of Parameter Passing

•Passing parameters as value parameters (pass by value) •Passing parameters as variable parameters (pass by reference)

CPSC 219: Advanced Java

James Tam

Passing Parameters As Value Parameters

method (p1); method ( )

Pass a copy

of the data

James Tam

Passing Parameters As Reference Parameters

method (p1); method ( )

Pass the address of the

parameter (referto the parameter in the method)

CPSC 219: Advanced Java

James Tam

Parameter Passing In Java: Simple Types

•All simple types are always passed by value in Java.

DescriptionType

1 bit true or false valueboolean16 bit Unicode characterchar64 bit signed real numberdouble32 bit signed real numberfloat64 bit signed integerlong32 bit signed integerint16 but signed integershort8 bit signed integerbyte

James Tam

Parameter Passing In Java: Simple Types (2)

•Location of the online example: -/home/219/examples/advanced/valueParameters -www.cpsc.ucalgary.ca/~tamj/219/examples/advanced/valueParameters public static void main (String [] args)quotesdbs_dbs2.pdfusesText_2