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IntelliJ IDEA provides multiple ways to generate common code constructs and recurring elements, which helps you increase productivity. These can be either predefined or custom templates that are applied differently based on the context, various wrappers, and automatic pairing of characters.
Additionally, IntelliJ IDEA provides code completion and Emmet support.
You'll get the dialog box of generate constructor. Here you can select whether you want the parameter or not. Select and hit Enter; Click Alt + Shift + s then click o You will get the same dialog box mentioned in the above (2). Do your selection. Feb 05, 2018 When we create a POJO (Plain Old Java Object) we also have to create constructors and getter and setter methods. Instead of doing this manually, Android Studio/IntelliJ has a handy shortcut.
From the main menu, select Code | GenerateAlt+Insert to open the popup menu with available constructs that you can generate.
Generate constructors
IntelliJ IDEA can generate a constructor that initializes specific class fields using values of corresponding arguments.
Generate a constructor for a class
- On the Code menu, click GenerateAlt+Insert.
- In the Generate popup, click Constructor.
- If the class contains fields, select the fields to be initialized by the constructor and click OK.
The following code fragment shows the result of generating a constructor for a class:
public class MyClass { int aInteger; double bDouble; public MyClass(int myAIntegerParam, double myBDoubleParam) { aInteger = myAIntegerParam; bDouble = myBDoubleParam; }}
Generate delegation methods
IntelliJ IDEA can generate methods that delegate behavior to the fields or methods of your class. This approach makes it possible to give access to the data of a field or method without directly exposing this field or method.
Generate a delegation method for a class
- On the Code menu, click GenerateAlt+Insert.
- In the Generate popup, click Delegate Methods.
- Select the target field or method, and click OK.
- Select the desired methods to be delegated and click OK.
The following code fragment shows the result of delegating the
get(i)
method of the Calendar
class inside another class:Calendar calendar;public int get(int i) { return calendar.get(i);}
Generate equals() and hashCode() methods
The Java super class
java.lang.Object
provides two methods for comparing objects:public boolean equals(Object obj)
returnstrue
if the object passed to it as the argument is equal to the object on which this method is invoked. By default, this means that two objects are stored in the same memory address.public int hashCode()
returns the hash code value of the object on which this method is invoked. The hash code must not change during one execution of the application but may change between executions.
It is generally necessary to override the
hashCode()
method if you override equals()
because the contract for hashCode()
is that it must produce the same result for objects that are equal. For more information, see the API specification for the Object class. Generate equals() and hashCode() for a class
- From the Code menu, click GenerateAlt+Insert.
- In the Generate popup, click equals() and hashCode().
- Select a velocity template from the Template list.You can also click to open the Templates dialog, where you can select an existing template or create a custom template.
- Select checkboxes if you want to accept subclasses and use getters during code generation.
- Click Next.
- Select the fields that should be used to determine equality, and click Next.
- Select the fields to use for calculating the hash code value. You can choose only from fields that were selected on the previous step (for determining equality). Click Next.
- Select the fields that contain non-null values. This optional step helps the generated code avoid checks for null and thus improves performance. Click Finish.
If the overrides for
equals()
and hashCode()
methods already exist in the class, you will be prompted whether you want to delete them before generating new ones. The following code fragment shows the result of overriding the
equals()
and hashCode()
methods:public boolean equals(Object o){ if(thiso)return true; if(onull||getClass()!=o.getClass())return false; FixedRateCurrencyExchangeService that=(FixedRateCurrencyExchangeService)o; if(Double.compare(that.rate,rate)!=0)return false; return true; }public int hashCode(){ long temp=rate!=+0.0d?Double.doubleToLongBits(rate):0L; return int(temp^(temp>>>32)); }
Generate getters and setters
IntelliJ IDEA can generate accessor and mutator methods (getters and setters) for the fields in your classes. Generated methods have only one argument, as required by the JavaBeans API.
The getter and setter method names are generated by IntelliJ IDEA according to your code generation naming preferences.
Generate getters and setters for a class:
- On the Code menu, click GenerateAlt+Insert.
- In the Generate popup, click one of the following:
- Getter to generate accessor methods for getting the current values of class fields.
- Setter to generate mutator methods for setting the values of class fields.
- Getter and Setter to generate both accessor and mutator methods.
- Select the fields to generate getters or setters for and click OK.You can add a custom getter or setter method by clicking and accessing the Getter/Setter Templates dialog. If a field is not in the list, then the corresponding getter and setter methods are already defined for it.
The following code fragment shows the result of generating the getter and setter methods for a class with one field
var
:public class MyClass { int field; public int getField() { return field; } public void setField(int field) { this.field = field; }}
Note for PHP
This feature is only supported in the Ultimate edition.
Intellij Generate Constructor Hot Key West
The following is only valid when the PHP plugin is installed and enabled.
Openssl generate public private key pair and csr 2. Sep 11, 2018 Generate a CSR and key pair locally on your server. The key pair consists of a public and private key. Send the CSR and public key to a CA who will verify your legal identity and whether you own and control the domain submitted in the application. So in order to generate a certificate, one needs atleast two critical pieces: a private-public key pair and a CSR. Whenever you generate a CSR, you will be prompted to provide information regarding the certificate. This information is known as a Distinguised Name (DN).
In the PHP context, getters and setters are generated using the PHP getter/setter file template. By default, as specified in these templates, setters are generated with the
set
prefix and getters with the set
or get
prefix according to the inferred field type boolean
or con-boolean
. The prefix is the value of the ${GET_OR_IS}
variable in the default getter template. The default template is configured in the Code tab on the File and Code Templates page of the Settings/Preferences dialog Ctrl+Alt+S. Generate toString()
The
toString()
method of the Java super class java.lang.Object
returns the string representation of the object. This method can be used to print any object to the standard output, for example, to quickly monitor the execution of your code. By default, toString()
returns the name of the class followed by the hash code of the object. You can override it to return the values of the object's fields, for example, which can be more informative for your needs. Override the toString() method for a class
- On the Code menu, click GenerateAlt+Insert.
- In the Generate popup, click toString().
- Configure the following:
- Select the template for generating the
toString()
method from the Template list. - Select the fields that you want to return in the generated
toString()
method. By default, all the available fields are selected. Click Select None to generate atoString()
method that returns only the class name.It is a good idea to performsome other action (type on the keyboard, move the mouse, utilize thedisks) during the prime generation; this gives the random numbergenerator a better chance to gain enough entropy. Publicand secret key created and signed.Generate and print a copy of your public key ID and fingerprint gpg -fingerprintAn an example of the fingerprint output, here is the output of theNMLUG Keymaster's fingerprint:pub 1024D/149-02-13 New Mexico Linux User Group KeymasterKey fingerprint = 724D 2514 93EC 83D4 E5BC D534 C5BC C12C 1493 1423sub 2048g/42685AC7 2003-02-13Store your PGP passphrase in a secure place, such as a password manager(is available for free to members of the Penn Community). Pgp generate public key from private key. - Select the Insert @Override checkbox if necessary.
- Click the Settings button to open the toString() Generation Settings dialog. where you can tune the behavior and add custom templates.
- Click OK.
If the
toString()
method is already defined in the class, by default, you will be prompted whether you would like to delete this method before proceeding. You can use the When method already exists group of options in the toString() Generation Settings dialog to change this behavior: either automatically replace existing method or generate a duplicating method. The following code fragment shows the result of generating the
toString()
method for a class with several fields defined:public class MyClass { private String name; private String url; private int port; private String[] validIPs; .. public String toString() { return 'MyClass{' + 'name=' + name + '' + ', url=' + url + '' + ', port=' + port + ', validIps=' + Arrays.toString(validIps) + '}'; } ..}
The following code inspections are related to the
toString()
method:- Class does not override 'toString()' method can be used to identify classes in which the
toString()
method is not defined. This inspection uses the exclude settings to ignore classes with fields that are not supposed to be dumped. An additional setting is to exclude certain classes using a regular expression matching their class name. As default, this is used to exclude any exception classes. - Field not used in 'toString()' method can be used to identify fields that are not dumped in the
toString()
method. For example, if you added new fields to a class, but forgot to add them to thetoString()
method. Change the severity of this inspection to show errors as warnings. This will highlight any unused fields in the editor and indicate their location as yellow markers on the scroll bar.
Custom code generation templates
Templates used for generating getters and setters, as well as
equals()
, hashCode()
, and toString()
methods are written in the Velocity template language. Although you can't modify predefined templates, you can add your own custom templates to implement necessary behavior. IntelliJ IDEA provides the following variables for Velocity templates:
The following variables can be used in templates for generating getters and setters:
Variable | Description |
---|---|
$java_version | The current version of the Java Runtime Environment (JRE). |
$class | The current class. |
$helper | Provides access to various code generation helper methods. |
$settings | Provides the ability to format names according to the current code style. |
$field | Field for which getter or setter is generated. |
The following variables can be used in templates for generating the
toString()
method:Variable | Description |
---|---|
$java_version | The current version of the Java Runtime Environment (JRE). |
$class | The current class. |
$helper | Provides access to various code generation helper methods. |
$settings | Provides the ability to format names according to the current code style. |
$fields | List of fields in the current class. |
The following variables can be used in templates for generating the
equals()
method:Variable | Description |
---|---|
$java_version | The current version of the Java Runtime Environment (JRE). |
$class | The current class. |
$helper | Provides access to various code generation helper methods. |
$settings | Provides the ability to format names according to the current code style. |
$fields | List of fields in the current class. |
$instanceBaseName | Predefined name of the object on which the equals() method is called. |
$baseParamName | Predefined name of the equals() method parameter. |
$superParamName | The name of the parameter in the equals() method of the superclass if applicable. |
$checkParameterWithInstanceof | Option passed from the wizard. |
$superHasEquals | Whether the superclass has equals() declared. |
The following variables can be used in templates for generating the
hashCode()
method:Variable | Description |
---|---|
$java_version | The current version of the Java Runtime Environment (JRE). |
$class | The current class. |
$helper | Provides access to various code generation helper methods. |
$settings | Provides the ability to format names according to the current code style. |
$fields | List of fields in the current class. |
$superHasHashCode | Whether the superclass has hashCode() declared. |
In IntelliJ IDEA Ultimate, the code completion popup is available for custom code generation template variables. Users of IntelliJ IDEA Community Edition can refer to the relevant source code.
I’ve gotten accustomed to many of the Java IDEs (Eclipse, Netbeans, IntelliJ) providing you with a command to generate a default constructor for a class based on the fields in the class.
For example:
Having a constructor populate the all of the fields of an object is such a common task in most OOP langauges, I’m assuming that there is a some way for me to save time writing this boilerplate code in C#. I’m new to the C# world, so I’m wondering if I’m missing something fundamental about the language? Is there some option in Visual Studio that is obvious?
Answers:
Resharper offers a Generate Constructor tool where you can select any field/properties that you want initialized. I use the Alt+Ins hot-key to access this.
Answers:
In visual studio 2015 Update3 I have this feature.
just by Highlighting properties and then press ctrl + . and then Press Generate Constructor.
For example if you’ve highlighted 2 properties it will suggest you to create a constructor with 2 parameters and if you’ve selected 3 it will suggest one with 3 parameters and so on.
also works with VS2017.
Answers:
C# added a new feature in Visual Studio 2010 called generate from usage. The intent is to generate the standard code from a usage pattern. One of the features is generating a constructor based off an initialization pattern.
The feature is accessible via the smart tag that will appear when the pattern is detected.
For example. Lets say I have the following class
And I write the following in my application
A constructor taking an
int
does not exist so a smart tag will show up and one of the options will be “Generate constructor stub”. Selecting that will modify the code for MyType
to be the following.Answers:
You could write a macro to do this — you would use Visual Studio’s parser to retrieve information about the class’s members.
I wrote a similar macro. (I’ll share the code below). The macro I wrote is for copying forward all of the constructors in a base class when you inherit from it (useful for classes like Exception that have lots of overloads on the ctor).
Here’s my macro (again, it doesn’t solve your problem, but you can probably modify to do what you want)
Answers:
Here is a macro that I use for that purpose. It will generate a constructor from fields and properties that have a private setter.
Answers:
Intellij Shortcuts Mac
Maybe you could try out this: http://cometaddin.codeplex.com/
Answers:
Here’s JMarsh‘s VS macro modified to generate a constructor based on the fields and properties in the class.
Answers:
I realize this is an old question, but if anyone is still looking for it you can do this easily with Resharper 8+. The
ctorf
, ctorp
, and ctorfp
snippets generate constructors that populate all the fields, properties, or fields and properties of a class.Answers:
For VS 2015 I found an extension that does just this. It seems to work well and has a reasonably high amount of downloads. So if you can’t or don’t want to use Resharper you can install this one instead.
UPDATE
You can also acquire it via nuget
Answers:
I’m using the following trick:
I select the declaration of the class with the data-members and press:
Intellij Hotkey Cheat Sheet
Ctrl+C, Shift+Ctrl+C, Ctrl+V.
- The first command copies the declaration to the clipboard,
- The second command is a shortcut that invokes the PROGRAM
- The last command overwrites the selection by text from the clipboard.
The PROGRAM gets the declaration from the clipboard,
finds the name of the class, finds all members and their types,
generates constructor and copies it all back into the clipboard.
finds the name of the class, finds all members and their types,
generates constructor and copies it all back into the clipboard.
Intellij Generate Constructor Hotkey 10
We are doing it with freshmen on my “Programming-I” practice (Charles University, Prague)
and most of students gets it done till the end of the hour.
and most of students gets it done till the end of the hour.
Intellij Generate Constructor Hotkey Download
If you want to see the source code, let me know.
Intellij Generate Constructor Hot Key Free
Tags: class, struct