Northcorp Software Interview Questions, Process, and Tips

In Java, == compares memory addresses while .equals() compares the actual content of objects.

• == compares memory addresses of objects, while .equals() compares the actual content.

• == is used to compare primitive data types, while .equals() is used to compare objects.

• Example: String str1 = new String("hello"); String str2 = new String("hello"); str1 == str2 will be false, but str1.equals(str2) will be true.

The question explains the difference between == and .equals() in Java for comparing object references and content.

• Use == to compare object references (memory location)

• Use .equals() to compare the actual content or values of the objects

• Example: String str1 = new String("hello"); String str2 = new String("hello"); str1 == str2 will be false, but str1.equals(str2) will be true

Immutable class in Java cannot be modified after creation, ensuring data integrity.

• Make the class final so it cannot be extended

• Make all fields private and final so they cannot be modified

• Do not provide setter methods, only getter methods to access the fields

• If the class contains mutable objects, make sure to return a deep copy of them in getter methods

The question is asking to create a class with certain restrictions like being final, having private and final fields, and no setter methods.

• Declare the class as final to prevent it from being subclassed.

• Make all fields private and final to ensure encapsulation and immutability.

• Provide no setter methods to enforce read-only access to the fields.

The final keyword in Java is used to restrict the user from changing the value of a variable, making a method not overrideable, or making a class not inheritable.

• Final variables cannot be reassigned once initialized.

• Final methods cannot be overridden in subclasses.

• Final classes cannot be extended by other classes.

The final keyword is used to declare final variables, final methods, and final classes in Java.

• Final variables cannot be reassigned once initialized.

• Final methods cannot be overridden in subclasses.

• Final classes cannot be extended.

The purpose of the FLEX property in CSS Flexbox is to define how a flex item will grow or shrink to fit the available space.

• The FLEX property is used to set the initial size of a flex item.

• It can be used to specify how much a flex item can grow or shrink relative to the other flex items.

• The FLEX property is a shorthand for the FLEX-GROW, FLEX-SHRINK, and FLEX-BASIS properties.

The flex property defines the ability of a flex item to grow, shrink, or stay the same size.

• The flex property is a shorthand for flex-grow, flex-shrink, and flex-basis properties.

• It allows a flex item to grow or shrink to fill the available space.

• Values for flex property include a unitless number for flex-grow, a unitless number for flex-shrink, and a length or percentage for flex-basis.

• Example: flex: 1 1 50%;

The static keyword in Java is used to create class-level variables and methods that can be accessed without creating an instance of the class.

• Static variables are shared among all instances of a class.

• Static methods can be called without creating an instance of the class.

• Static blocks are used to initialize static variables.

• Static keyword can also be used to create static nested classes.

To reverse a list in Python, you can use the built-in reverse() method or slicing technique.

• Use the reverse() method to reverse the list in place: list.reverse()

• Use slicing to create a new reversed list: reversed_list = list[::-1]

The reverse method() is used to reverse the order of elements in an array.

• Use the reverse() method on an array to reverse the order of its elements.

• Example: $arr = [1, 2, 3]; reverse($arr); // Output: [3, 2, 1]