Boolean as parameters java

The Boolean class wraps a value of the primitive type boolean in an object. An object of type Boolean contains a single field whose type is boolean . In addition, this class provides many methods for converting a boolean to a String and a String to a boolean , as well as other constants and methods useful when dealing with a boolean .

Field Summary

Constructor Summary

Allocates a Boolean object representing the value true if the string argument is not null and is equal, ignoring case, to the string «true» .

Method Summary

Returns true if and only if the argument is not null and is a Boolean object that represents the same boolean value as this object.

Returns true if and only if the system property named by the argument exists and is equal to the string «true» .

Methods inherited from class java.lang.Object

Field Detail

TRUE

FALSE

TYPE

Constructor Detail

Boolean

public Boolean(boolean value)

Allocates a Boolean object representing the value argument. Note: It is rarely appropriate to use this constructor. Unless a new instance is required, the static factory valueOf(boolean) is generally a better choice. It is likely to yield significantly better space and time performance.

Boolean

Allocates a Boolean object representing the value true if the string argument is not null and is equal, ignoring case, to the string «true» . Otherwise, allocate a Boolean object representing the value false . Examples: new Boolean(«True») produces a Boolean object that represents true .
new Boolean(«yes») produces a Boolean object that represents false .

Method Detail

parseBoolean

Parses the string argument as a boolean. The boolean returned represents the value true if the string argument is not null and is equal, ignoring case, to the string «true» . Example: Boolean.parseBoolean(«True») returns true .
Example: Boolean.parseBoolean(«yes») returns false .

booleanValue

public boolean booleanValue()

valueOf

Returns a Boolean instance representing the specified boolean value. If the specified boolean value is true , this method returns Boolean.TRUE ; if it is false , this method returns Boolean.FALSE . If a new Boolean instance is not required, this method should generally be used in preference to the constructor Boolean(boolean) , as this method is likely to yield significantly better space and time performance.

valueOf

Returns a Boolean with a value represented by the specified string. The Boolean returned represents a true value if the string argument is not null and is equal, ignoring case, to the string «true» .

toString

Returns a String object representing the specified boolean. If the specified boolean is true , then the string «true» will be returned, otherwise the string «false» will be returned.

toString

Returns a String object representing this Boolean’s value. If this object represents the value true , a string equal to «true» is returned. Otherwise, a string equal to «false» is returned.

hashCode

public static int hashCode(boolean value)

equals

Returns true if and only if the argument is not null and is a Boolean object that represents the same boolean value as this object.

getBoolean

Returns true if and only if the system property named by the argument exists and is equal to the string «true» . (Beginning with version 1.0.2 of the Java TM platform, the test of this string is case insensitive.) A system property is accessible through getProperty , a method defined by the System class. If there is no property with the specified name, or if the specified name is empty or null, then false is returned.

compareTo

compare

public static int compare(boolean x, boolean y)

Boolean.valueOf(x).compareTo(Boolean.valueOf(y))

logicalAnd

public static boolean logicalAnd(boolean a, boolean b)

logicalOr

public static boolean logicalOr(boolean a, boolean b)

logicalXor

public static boolean logicalXor(boolean a, boolean b)

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Passing a Boolean Value in Java

Solution 1: A variable created inside a method cannot be used outside the method and if it’s not being used anywhere else in the current method, it’s a warning by the compiler to improve code quality. The assignment of a value without any use elsewhere is unnecessary. To avoid this, make the return flag and use the value accordingly. Solution 2: Passing values and passing by reference may be confusing. Literal values can be passed and setting a value of a variable does not mean the variable is being used.

Java passing boolean value

There are some mistakes present in your code and I will make an effort to identify them.

Initially, the following code is presented: if-statement .

A body composed of an opening brace and a closing brace is necessary for an if-statement . Although it may compile, having no purpose renders it useless.

As it seems to be a getter for boolean , the conditional verification can be abbreviated to:

Your assertion of isLeapYear being true is not accurate and unnecessarily repeated.

if (isLeapYear)//again checking if true. !isLeapYear would be checking for false.

Your constructor is constructed in an unconventional and erroneous manner. Initially, when implementing an if-else statement, it is imperative to use braces.

Although it is considered valid, it is not recommended as a good practice.

if (condition) //do soemthing

The following requires braces:

if (condition) < >else if (another condition) < >(. )

To resolve the issue, it should be noted that methods can only be defined at the class level, and not within another method. Therefore, when a getter is being defined within a constructor, it is essential to ensure that it is declared outside the constructor.

public Date() < (. ) >public boolean getisLeapYear()

Additionally, it is possible to declare multiple instances of a variable in a single declaration by connecting them.

String month; String day; String year;

I cannot guarantee that it addresses all your errors, but it’s a promising beginning.

How do I use optional parameters in Java?, There are no optional parameters in Java. What you can do is overloading the functions and then passing default values. void SomeMethod (int age, String name) < // >// Overload void SomeMethod (int age) < SomeMethod (age, "John Doe"); >VarArgs and overloading have been mentioned.

Sending boolean as request parameter

It seems unlikely to me as the request is always in the form of a string. However, there may be alternative approaches available.

boolean hasCreatePermission= Boolean.parseBoolean(request.getParameter("hasCreatePermission"));

Assuming that it is a boolean, you have the option to utilize.

boolean value = Boolean.valueOf(yourStringValue)

The servlet translates all parameters as Strings, so it is necessary to convert the value of the String to Boolean.

Boolean.parseBoolean(request.getParameter("hasCreatePermission"));

In order to circumvent the need for manual parsing, utilizing a framework such as Spring MVC or Struts is necessary.

Calling method with Optional parameter in Java 8, Optional is a class and in Java you must pass the exact number of parameters to a method just like it is defined. The only exception is when you put after the class object name in the method declaration. public String test (String X, String Y) < >Which makes the second parameter be either zero or more. Share.

Passing boolean argument in method but method boolean variable is still unused

The ageValidationStatus is restricted to the ageRestrProcessor method and cannot be accessed outside of it. This applies to the local variable as well, which is not utilized in any other part of the current method.

The compiler issues a warning to enhance code quality when there is an unnecessary assignment of value that serves no other purpose.

Utilize the output of ageRestrProcessor to set the boolean flag and apply its value as needed.

 boolean ageRestrProcessor(int keyNum, String itemNameFromDB, double itemUnitPriceFromDB, boolean ageValidationStatus, boolean ageValidator, String itemUnit, Map map) < //..code // you can remove boolean ageValidationStatus from method signature if (ageValidator)< //..code return false; >else < System.out.println("\tShopper is underage. Item not added"); return true; >>

ageNotValidated = ip.ageRestrProcessor(keynum++. ;

There seems to be a confusion between passing values and passing by reference. It should be noted that primitive types in Java are passed by value by default.

When a by-value parameter is modified within a method, it affects only the copy of the parameter, not the original variable that was passed as an argument.

When utilizing pass by value, it is not necessary for the parameter to be a variable. Literal values can also be passed in.

Merely assigning a value to a variable does not imply its usage. In case the variable remains unread, it is categorized as «dead code» as it serves no purpose. As a result, a warning is issued.

I recommend that ageRestrProcessor() returns a boolean value to confirm age verification in your situation. The initial boolean can be modified by the caller accordingly.

Java — How to do an action if an optional boolean is true?, In Java 8, I have a variable, holding an optional boolean. I want an action to be executed, if the optional is not empty, and the contained boolean is true. I am dreaming about something like ifPresentAndTrue, here a full example:

How to pass a Boolean parameter in cucumber with java?

Refer to the documentation at https://cucumber.io/docs/cucumber/cucumber-expressions/ and utilize the @ParameterType code.

@ParameterType(value = "true|True|TRUE|false|False|FALSE") public Boolean booleanValue(String value) < return Boolean.valueOf(value); >@Then("Something is set to ") public void somethingIsSetTo(Boolean value)

It’s impossible to transform «admin» into a boolean value, but you could specify the type of user by incorporating a back reference in the regular expression with parentheses.

@Then("test if he is a (admin|user)") public void verify_connect(String userType)

Java passing boolean value, I cant get these to compile it seems to be where I’m trying to pass the Boolean value. The first one has 2 errors that don’t make any sense to me public class Date < public int m; publ Stack Overflow. Java passing boolean value [closed] Ask Question Asked 7 years, 8 months ago. Modified 7 years, 8 months ago. Viewed …

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Java boolean keyword

Java boolean keyword is used to declare a variable as a boolean type which represents only one of two possible values i.e. either true or false .

In java, by default boolean variables are initialized with false.

boolean keyword can be used with –

Please note that size of boolean in Java is not precisely defined and it depends upon the Java Virtual Machine (JVM).

The boolean keyword can be used as shown in given examples.

//1. variable boolean isMajorVersion = false; //2. method parameters public void setValid( boolean valid ) < //code >//3. method return type public boolean isValid() < //code >

We have a class java.lang.Boolean (with ‘B’ in capital) in Java. Boolean class is a wrapper class provided to wrap boolean primitive value. It has a single field of type boolean.

We can assign a boolean primitive values to Boolean object directly. It is called autoboxing in Java where primitive values are automatically converted to their wrapper classes.

Boolean b = new Boolean( true ); //or Boolean b = true; //autoboxing

Java program to show the usage of boolean keyword.

public class Main < public static void main(String[] args) < boolean condition = true; if(condition) < System.out.println("Condition is true"); >else < System.out.println("Condition is false"); >Boolean condObj = condition; System.out.println(condObj.booleanValue()); > >

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