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Browse Coursessetter method: class Bank { private int minimumbalance=2500; public int setminimumBalance(int value)//setter method { this.minimumbalance=value;//minimumbalance=10000 System.out.println(minimumbalance); } } class Accountholder { public static void main(String args[]) { Bank bb=new Bank(); bb.setminimumBalance(10000); }}
Encapsulation:[Bundling of fields[variables] and method inside a single class] adv: It prevents outer classes from accessing and changing the fields of a class getter & setter methods in java[POJO class]==>plain old java objects gettermethod–>there must be a returntype other than void class Bank { private int minimumbalance=2500; public int getminimumBalance()//getter […]
Remove duplicates: {1,2,2,3,4,4,5} output: 1 2 3 4 5 Program class Removeduplicates { public static void main(String args[]) { int arr[]={1,2,2,3,4,4,4,5}; int temp[]=new int[5];//0-4 int j=0; for(int i=0; i<arr.length-1; i++)0<7 { if(arr[i]!=arr[i+1])1 not equals 2 { temp[j++]=arr[i];temp[0]=1 2 } } temp[j++]=arr[arr.length-1]; for(int i=0;i<j;i++) { System.out.println(temp[i]+” “); } }}
Abstract class Interface The abstract keyword is used to The interface keyword is used to declare the abstract class—————— declare the interface ——————————————————————————– Abstract class can have abstract————-interface can have only abstract and non-abstract methods methods ———————————————————————————- Abstract class doesn’t support interface will support multiple multiple inheritance inheritance ———————————————————————————– An Abstract class can […]
Abstraction: Data Abstraction is the process of hiding certain details and showing only the essential information to the user Abstraction can be achieved either with abstract class or interface in java Program abstract class Student { abstract void paperarrear();//abstract method void colgatn()//non abstract method { System.out.println(“He will atn the cls regularly”); […]
35. What are design patterns? Design patterns are reusable solutions to common software design problems. Examples: Singleton, Factory, Observer. 36. Explain the Singleton design pattern. Restricts a class to one instance and provides a global access point to it. java CopyEdit class Singleton { private static Singleton instance; private Singleton() () public static Singleton […]
17. What is exception handling? How is it implemented in Java? Exception handling manages runtime errors using try, catch, throw, throws, and finally. 18. Differentiate between throw and throws keywords. throw: Used to explicitly throw an exception. throws: Declares exceptions a method might throw. 19. What are checked and unchecked exceptions? Checked: Checked at compile-time […]
12. Describe the access modifiers in Java. Public: Accessible everywhere. Protected: Accessible within the same package and subclasses. Default: Accessible within the same package only. Private: Accessible within the same class only. 13. What is encapsulation? How is it implemented in Java? Encapsulation is bundling data (variables) and methods into a single unit (class). […]
7. What are constructors in Java? How are they different from methods? Constructors: Special methods to initialize objects. Name matches the class. No return type. Difference from methods: Methods perform actions; constructors initialize objects. 8. Explain method overloading and method overriding with examples. Overloading: Same method name, different parameters (compile-time polymorphism). java CopyEdit class […]
1. What is Java? Explain its features. Java is a high-level, object-oriented programming language developed by Sun Microsystems (now Oracle) in 1995. Key features: Platform Independent: Write Once, Run Anywhere (WORA). Object-Oriented: Follows OOP principles like encapsulation and inheritance. Robust: Strong memory management and exception handling. Multithreaded: Supports concurrent execution of threads. Secure: No […]
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