Java method Comparison Table

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Java method comparison table

Subject refer to wait until have default implementation call by have is part of is a kind of is a subtopic of have example overuse have return type is an instance of have purpose access by have arguments has part have result mark as declare used in contain create by write for

equals method a comment at its head if the method is non-obvious The Basics of Java
boolean b = aPostalCode.equals(anotherPostalCode);
Java method to test whether two objects are equal i.e. they contain the same data, but are not necessarily the same object other methods and variables in any class in the same package by default

Java abstract method a comment at its head if the method is non-obvious Java method The Basics of Java to serve as a placeholder, indicating that subclasses must have concrete implementations other methods and variables in any class in the same package by default any executable statements in its body labelling it with the keyword abstract

Java class method using the name of the class, followed by a dot, followed by the name of the method (the name of the class can be omitted when calling a class method in the current class) 'this' value when it is executing Java method The Basics of Java implementing functions such as initializing a class, or operating on the complete set of instances of a class other methods and variables in any class in the same package by default static

Java constructor the same name as its class a class Java method The Basics of Java
public Account(String accountHolder, float initialBalance)
{
this.accountHolder = accountHolder;
balance = initialBalance;
opened = new Date();
}
public Account(String accountHolder)
{
this.accountHolder = accountHolder;
balance =0.0;
opened = new Date();
}
to initialize the instance variables of a newly created object and perform any other needed initialization other methods and variables in any class in the same package by default

Java instance method the object itself using the 'this' keyword a comment at its head if the method is non-obvious Java method The Basics of Java
public float credit(float amountToCredit)
{
balance = balance + amountToCredit;
return balance;
}
void if it does not return anything other methods and variables in any class in the same package by default return type public, protected or private

println a comment at its head if the method is non-obvious The Basics of Java
System.out.println("This line will be printed");
Java method other methods and variables in any class in the same package by default

private method a comment at its head if the method is non-obvious Java method The Basics of Java code in the same class

protected method a comment at its head if the method is non-obvious Java method The Basics of Java code in the same package as this class as well as code in any subclasses, even if they are not in the same package

public method a comment at its head if the method is non-obvious Java method The Basics of Java any code anywhere

readObject an object is received over the socket, or until an I/O error occurs, which will happen if the program at the other end of the connection is terminated a comment at its head if the method is non-obvious 3.5 - Technology Needed to Build Client-Server Systems Java method other methods and variables in any class in the same package by default client-server systems

substring a comment at its head if the method is non-obvious The Basics of Java
String sub = "submariner".substring(0,3); // = "sub"
Java method to extract part of a string other methods and variables in any class in the same package by default starting position and ending position + 1 a new String with a sequence of characters from the original string

toString the name of the class followed by a hexadecimal code that distinguishes one instance from another a comment at its head if the method is non-obvious The Basics of Java Java method to convert any kind of object into a string other methods and variables in any class in the same package by default every class you create

Next Java module: Java package Up: Java module, method Previous Java module: Java class

Subject	refer to	wait until	have default implementation	call by	have	is part of	is a kind of	is a subtopic of	have example	overuse	have return type	is an instance of	have purpose	access by	have arguments	has part	have result	mark as	declare	used in	contain	create by	write for
equals method					a comment at its head if the method is non-obvious			The Basics of Java	boolean b = aPostalCode.equals(anotherPostalCode);			Java method	to test whether two objects are equal i.e. they contain the same data, but are not necessarily the same object	other methods and variables in any class in the same package by default
Java abstract method					a comment at its head if the method is non-obvious		Java method	The Basics of Java					to serve as a placeholder, indicating that subclasses must have concrete implementations	other methods and variables in any class in the same package by default							any executable statements in its body	labelling it with the keyword abstract
Java class method				using the name of the class, followed by a dot, followed by the name of the method (the name of the class can be omitted when calling a class method in the current class)	'this' value when it is executing		Java method	The Basics of Java					implementing functions such as initializing a class, or operating on the complete set of instances of a class	other methods and variables in any class in the same package by default				static
Java constructor					the same name as its class	a class	Java method	The Basics of Java	public Account(String accountHolder, float initialBalance) { this.accountHolder = accountHolder; balance = initialBalance; opened = new Date(); } public Account(String accountHolder) { this.accountHolder = accountHolder; balance =0.0; opened = new Date(); }				to initialize the instance variables of a newly created object and perform any other needed initialization	other methods and variables in any class in the same package by default
Java instance method	the object itself using the 'this' keyword				a comment at its head if the method is non-obvious		Java method	The Basics of Java	public float credit(float amountToCredit) { balance = balance + amountToCredit; return balance; }		void if it does not return anything			other methods and variables in any class in the same package by default		return type			public, protected or private
println					a comment at its head if the method is non-obvious			The Basics of Java	System.out.println("This line will be printed");			Java method		other methods and variables in any class in the same package by default
private method					a comment at its head if the method is non-obvious		Java method	The Basics of Java						code in the same class
protected method					a comment at its head if the method is non-obvious		Java method	The Basics of Java						code in the same package as this class as well as code in any subclasses, even if they are not in the same package
public method					a comment at its head if the method is non-obvious		Java method	The Basics of Java						any code anywhere
readObject		an object is received over the socket, or until an I/O error occurs, which will happen if the program at the other end of the connection is terminated			a comment at its head if the method is non-obvious			3.5 - Technology Needed to Build Client-Server Systems				Java method		other methods and variables in any class in the same package by default						client-server systems
substring					a comment at its head if the method is non-obvious			The Basics of Java	String sub = "submariner".substring(0,3); // = "sub"			Java method	to extract part of a string	other methods and variables in any class in the same package by default	starting position and ending position + 1		a new String with a sequence of characters from the original string
toString			the name of the class followed by a hexadecimal code that distinguishes one instance from another		a comment at its head if the method is non-obvious			The Basics of Java				Java method	to convert any kind of object into a string	other methods and variables in any class in the same package by default									every class you create