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Commit 606baba

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add new core java solutions Aug 10
1 parent ff49a94 commit 606baba

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‎.gitignore‎

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.idea
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package CovariantReturnType;
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public class Car extends Vehicle {
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public int a = 2;
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@Override
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public Car getInstance() {
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return new Car();
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}
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public static void main(String[] args) {
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Vehicle vehicle = new Vehicle();
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Car car = new Car();
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Vehicle vehicle1 = vehicle.getInstance();
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Car car1 = car.getInstance();
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System.out.println(vehicle1.b);
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System.out.println(car1.a);
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}
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}
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package CovariantReturnType;
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public class Vehicle {
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public int b = 3;
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public Vehicle getInstance() {
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return new Vehicle();
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}
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}
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package FunctionalInterfacesInJDK;
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import java.util.function.Consumer;
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import java.util.function.Function;
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import java.util.function.Predicate;
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import java.util.function.Supplier;
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public class FuncInterfacesDemo {
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public static void greet(String name) {
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System.out.println("Hello " + name);
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}
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public static void main(String[] args) {
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Consumer<String> consumer1 = FuncInterfacesDemo::greet; // Using method reference
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consumer1.accept("Biplob"); // No return
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Consumer<String> consumer2 = name -> System.out.println("Hello " + name); // Using Lambda Expression
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consumer2.accept("Imam");
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Predicate<Integer> predicate = number -> number > 10;
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System.out.println(predicate.test(4)); // Boolean return
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Function<String, Boolean> function = name -> name.contains("m");
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System.out.println(function.apply("Imam"));
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Supplier<Integer> supplier = () -> 2+2;
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System.out.println(supplier.get());
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}
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}
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package InheritanceAndInterface;
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public interface Colorable {
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void setColor(String color);
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}
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package InheritanceAndInterface;
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public interface Shape {
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double getArea();
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}
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package InheritanceAndInterface;
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public class Square implements Shape, Colorable {
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private double side;
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private String color;
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public Square(double side) {
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this.side = side;
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}
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public double getSide() {
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return side;
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}
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public void setSide(double side) {
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this.side = side;
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}
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public String getColor() {
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return color;
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}
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@Override
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public void setColor(String color) {
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this.color = color;
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}
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@Override
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public double getArea() {
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return side*side;
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}
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public static void main(String[] args) {
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Square square = new Square(2.0);
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square.setColor("Green");
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System.out.println(square.getArea());
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System.out.println(square.getColor());
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}
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}
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package InterfaceDefaultAndStaticMethodsConflict;
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public class MyClass implements MyInterface {
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static void staticMethod() {
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System.out.println("Static Method of Class");
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}
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@Override
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public void myMethod() {
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System.out.println("My Method from Class");
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}
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public static void main(String[] args) {
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MyInterface conflict = new MyClass();
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conflict.myMethod();
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MyInterface.staticMethod();
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MyClass.staticMethod();
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}
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}
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package InterfaceDefaultAndStaticMethodsConflict;
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public interface MyInterface {
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default void myMethod() {
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System.out.println("My Method");
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}
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static void staticMethod() {
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System.out.println("Static Method of Interface");
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}
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}
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package InterfaceInheritance;
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public interface Drawable {
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void draw();
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}

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