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What is the difference between 'this' and 'super' keywords?
In programming, particularly in Java, the this and super keywords have distinct purposes: The **this** keyword is used within an instance method or a constructor to refer to the current object. It’s often used to eliminate ambiguity between class attributes and parameters with the same name, or to iRead more
In programming, particularly in Java, the this and super keywords have distinct purposes:
The **this** keyword is used within an instance method or a constructor to refer to the current object. It’s often used to eliminate ambiguity between class attributes and parameters with the same name, or to invoke other constructors of the same class in a process known as constructor chaining.
See lessThe **super** keyword is used to access members (methods or variables) of the parent class. It can be used to call the superclass’s constructor, and it’s also used when subclass methods want to call overridden methods in the superclass.
How can you implement method chaining in Java?
Method chaining in Java is implemented by having a series of methods in a class that return the this reference, allowing the invocation of multiple methods on the same object in a single line.
Method chaining in Java is implemented by having a series of methods in a class that return the this reference, allowing the invocation of multiple methods on the same object in a single line.
See lessDescribe the concept of method references in Java 8.
Method references in Java 8 are a shorthand notation of a lambda expression to call a method. They are used to refer directly to a method without executing it. By using method references, you can point to methods by their names and pass them as arguments to other methods or constructors. There are fRead more
Method references in Java 8 are a shorthand notation of a lambda expression to call a method. They are used to refer directly to a method without executing it. By using method references, you can point to methods by their names and pass them as arguments to other methods or constructors.
There are four types of method references:
Reference to a Static Method: For example, ClassName::staticMethodName
See lessReference to an Instance Method of a Particular Object: For example, instance::instanceMethodName
Reference to an Instance Method of an Arbitrary Object of a Particular Type: For example, ClassName::instanceMethodName
Reference to a Constructor: For example, ClassName::new
Method references help to make your code more concise and readable, especially when the lambda expression is simply invoking an existing method.
Explain the concept of functional interfaces.
A functional interface in Java is an interface that contains exactly one abstract method. This restriction ensures that the interface can be used for lambda expressions or method references, fitting into Java’s functional programming paradigm. Functional interfaces can have any number of default orRead more
A functional interface in Java is an interface that contains exactly one abstract method. This restriction ensures that the interface can be used for lambda expressions or method references, fitting into Java’s functional programming paradigm. Functional interfaces can have any number of default or static methods, but only one abstract method. They are often marked with the @FunctionalInterface annotation to indicate their purpose and to enforce the single abstract method rule during compile-time.
See lessWhat is the 'default' keyword used for in interfaces?
In Java, the default keyword is used in interfaces to provide a default implementation for methods. Before Java 8, interfaces could only contain abstract methods without an implementation. The introduction of default methods allows interfaces to have methods with a body, which can be inherited by clRead more
In Java, the default keyword is used in interfaces to provide a default implementation for methods. Before Java 8, interfaces could only contain abstract methods without an implementation. The introduction of default methods allows interfaces to have methods with a body, which can be inherited by classes that implement the interface without the need for an overriding implementation.
See lessDescribe the purpose of the 'Comparator' interface.
The Comparator interface in Java is used to define a custom ordering for objects of a user-defined class. It allows for sorting elements based on specific criteria that you define, which can be different from the natural ordering. The Comparator interface contains the compare() method, where you impRead more
The Comparator interface in Java is used to define a custom ordering for objects of a user-defined class. It allows for sorting elements based on specific criteria that you define, which can be different from the natural ordering. The Comparator interface contains the compare() method, where you implement the logic to compare two objects.
See lessHow can you sort collections in Java?
In Java, you can sort collections such as lists using the Collections.sort() method for natural ordering or with a custom Comparator. For example Collections.sort(list); Collections.sort(list, new Comparator() { public int compare(Type o1, Type o2) { // custom comparison logic } });
In Java, you can sort collections such as lists using the Collections.sort() method for natural ordering or with a custom Comparator. For example Collections.sort(list);
See lessCollections.sort(list, new Comparator() {
public int compare(Type o1, Type o2) {
// custom comparison logic
}
});
What is the 'Two-State Solution' in the Israeli-Palestinian conflict?
A proposed solution envisioning an independent State of Palestine alongside the State of Israel.
A proposed solution envisioning an independent State of Palestine alongside the State of Israel.
See lessWhat was the Treaty of Westphalia's main contribution? to international politics
The establishment of the concept of state sovereignty.
The establishment of the concept of state sovereignty.
See lessWhat is a defination of 'Realpolitik
Politics based on practical and material factors rather than on theoretical or ethical objectives.
Politics based on practical and material factors rather than on theoretical or ethical objectives.
See less