Trong một abstract class, khai báo nào sau đây hợp lệ?doneprivate static long note = 100;final abstract void doSomething(int things);public abstract int getTotal(int a, int b) {return 0;}static void writeIt(String a) {System.out.println(a);}

What happens when the following program is compiled and run?public abstract class MyAbstract { abstract int getSum();abstract int getSum(int x);abstract int getSum(int x, int y);} public abstract class Sub extends MyAbstract { int x = 4; int getSum(){return x + x;}int getSum(int x){return x + x;}int getSum(int x, int y){int z = x + y;System.out.print(z);return z;}public static void main(String[] args){Sub sub = new Sub();sub.getSum(4,2);}}

Select the correct answerWhat will be the output of the following Java program? class access { static int x; void increment() { x++; } } class static_use { public static void main(String args[]) { access obj1 = new access(); access obj2 = new access(); obj1.x = 0; obj1.increment(); obj2.increment(); System.out.println(obj1.x + " " + obj2.x); } }Options 2 21 11 2Compilation Error

What is the output of the below Java program with an abstract class?abstract class MathLibrary{ static final float PI = 3.1415f;}public class AbstractClassTesting3{ public static void main(String[] args) { System.out.println(MathLibrary.PI); }}A) 3.1415B) No OutputC) ErrorD) None of the above

Given the following methods: static String saySomething(String name) { return "Hi, " + name; } static String saySomething(String name, int count) { String greeting = ""; for(int i = 0; i < count; i++) { greeting += "Welcome, " + name + "\n"; } return greeting; }Which of the following would need to be called to result in the output:Hi, Sophiaa.)System.out.println(saySomething(1,"Sophia"));b.)System.out.println(saySomething("Sophia",1));c.)System.out.println(saySomething("Hi Sophia"));d.)System.out.println(saySomething("Sophia"));

class Calculator {    public static int add(int a, int b) {        return a + b;    }    public static int add(int a, int b, int c) {        return a + b + c;    }}public class Main {    public static void main(String[] args) {        int result1 = Calculator.add(10, 20);        int result2 = Calculator.add(10, 20, 30);        System.out.println("Result1: " + result1 + ", Result2: " + result2);    }}a.Result1: 30, Result2: 60b.Result1: 20, Result2: 30c.None of the aboved.Compilation Error