The OOP class Cheat Sheet

A Programming › Java cheat sheet in English by Trinesh.Gov

How to code methods and make UI classes

3,054 views 989 downloads 21 Jan 2025 History

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PUBLIC Static & Constant fields:

Static fields: ( Underlined! )	Constant fields: (All CAPS! )
public static int totalQty	public static final int MARKUP = 75;

NB, to call static methods in UI class, you need to say:
"class name".totalQty

How to make the UI class:

String name = JOptionPane.showInputDialog("Enter the name of the person");
String ID = JOptionPane.showInputDialog("Enter the ID number of the person");

class name fruitObj = new class name✓(name, ID);
System.out.println(fruitObj);

NB, When calling up the fields whe instantiating the object, MAKE SURE that the field names are the SAME as the constructor in the OOP class!

Accessor/Typed methods:

public int getSize()
{
return size;
}

Mutator/void Methods:

public void setSize (int s)
{
size = s;
}

Field types:

Private: ( - )	Public: ( + )	Protected: ( # )
private String name	public int age	protected boolean smoke

PRIVATE static fields

private static int totalQty

NB, each private static field needs its own STATIC ACCESSOR method:
public static int getTotalQty()
{
return totalQty;
}

NB, to call private static field in UI class, use the created accessor method:
"class name".getTotalQty()

Constructors:

Default Constructor:
Public "class name"
{
size = 2;
}

Parameterized Constructor:
Public "class name"(int s, char p)
{
size = s;
pattern = p;
}

The toString method:

public String toString()
{
return "The total amount is " + amount + "\n" + " The date is " + day;
}

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