Java Programming Quiz

What will be the output of the following program? interface I1 { default void m2() { System.out.println("bye"); } void m1(); } @FunctionalInterface interface I2 extends I1 { default void m2() { System.out.println("hello"); } } public class Test { public static void main(String[] args) { I2 x = () -> System.out.println("hi"); x.m1(); x.m2(); } }

• hi bye

• Compilation Error

• hi hello

• Runtime Error

What will the output of the following code? public interface A111 { String s = "yo"; public void method1(); } interface B { } interface C extends A111, B { public void method1(); public void method1(int x); }

• Compilation succeeds.

• Compilation fails due to multiple errors.

• Compilation fails due to an error only on line 20.

• Compilation fails due to an error only on line 21.

• Compilation fails due to an error only on line 22.

What will be the output of the following program? import java.util.function.Predicate; public class Test { public static void main(String[] args) { Predicate greater = a -> a > 15; Predicate less = a -> a < 10; boolean bool = greater.test(20); boolean bool1 = less.test(5); System.out.println(bool); System.out.println(bool1); } }

• no output

• true true

• true false

• true

• true true

Is there any error in the following code? @FunctionalInterface public interface MyInterface { String myInterface(String a); int hashCode(); String toString(); }

• The code will compile.

• The code will give a compilation error.

What will be the output of the following program? @FunctionalInterface interface MyInterface { String cal(String value); } public class FunctionalInterfaceExample { public static void main(String[] args) { MyInterface myInterface = (String value) -> 75 + value; System.out.println(myInterface.cal("hi" + 25)); } }

• hi7525

• hi2527

• 75hi25

• hi100

• None of the above

What will be the output of the following program? @FunctionalInterface interface MyInterface { public String nit(String name); } public class FunctionalInterfaceExample { public static void main(String[] args) { MyInterface myInterface = (String name) -> "Welcome to "; System.out.println(myInterface.nit("Learning")); } }

• Welcome to Learning

• Learning Welcome to

• No output

• Compile time error

• Welcome to

What will be the output of the following program? @FunctionalInterface interface Movie { String movieName(); } public class TestMcq { public static void main(String[] args) { Movie m = () -> return "DDLJ"; System.out.println(m.movieName()); } }

• No output

• DDLJ

• ddlj

• Movie

• Compile time error

What will be the output of the following program? @FunctionalInterface interface I { int myInterface(int a, int b); } public class TestMcq { public static void main(String[] args) { I i = (a, b) -> { int div = a / b; int addition = a + b; return addition; }; i.myInterface(12, 3); } }

• 4

• 15

• 19

• No output

• Compile time error

What will be the output of the following program? interface I1 { Object m1(); } interface I2 { String m1(); } class A1 implements I1, I2 { @Override public Object m1() { System.out.println("m1"); return new Object(); } } public class TestMcq { public static void main(String[] args) { A1 a = new A1(); a.m1(); } }

• m1

• m1 A1@123a3e

• Compile time error

• Runtime Error

What will be the output of the following program? class Example { int x; int y; public Example(int x, int y) { this.x = x; this.y = y; } } public class TestMcq { public static void main(String[] args) { Predicate p1 = (e) -> e.x < e.y; System.out.println(p1.test(new Example(1, 2))); Predicate p2 = (e) -> e.x > e.y; p2.test(new Example(1, 2)); } }

• true false

• true

• true true

• false

• No output