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Test: Methods in Java - 1 - Software Development MCQ


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20 Questions MCQ Test Basics of Java - Test: Methods in Java - 1

Test: Methods in Java - 1 for Software Development 2024 is part of Basics of Java preparation. The Test: Methods in Java - 1 questions and answers have been prepared according to the Software Development exam syllabus.The Test: Methods in Java - 1 MCQs are made for Software Development 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Methods in Java - 1 below.
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Test: Methods in Java - 1 - Question 1

Which of the following statements about methods in Java is correct?

Detailed Solution for Test: Methods in Java - 1 - Question 1

In Java, methods are defined within classes and can be called from other classes as well.

Test: Methods in Java - 1 - Question 2

What is the output of the following code?
public class MyClass {
   public static void main(String[] args) {
      int result = sum(3, 4);
      System.out.println(result);
   }

   public static int sum(int a, int b) {
      return a + b;
   }
}

Detailed Solution for Test: Methods in Java - 1 - Question 2

The 'sum' method takes two integers as parameters and returns their sum. The 'main' method calls the 'sum' method with arguments 3 and 4, so the output will be the sum of these numbers, which is 7.

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Test: Methods in Java - 1 - Question 3

What will happen if a method with a void return type is called and the result is not assigned to any variable?

Detailed Solution for Test: Methods in Java - 1 - Question 3

When a method with a void return type is called, the method executes its statements but does not return a value. If the result is not assigned to any variable, it simply means that the result is not used, but the program will execute normally.

Test: Methods in Java - 1 - Question 4

What is the purpose of the "return" keyword in a method?

Detailed Solution for Test: Methods in Java - 1 - Question 4

The "return" keyword is used to return a value from a method. It terminates the method's execution and sends the specified value back to the caller.

Test: Methods in Java - 1 - Question 5

What will be the output of the following code?
public class MyClass {
   public static void main(String[] args) {
      int result = multiply(3, 4);
      System.out.println(result);
   }

   public static int multiply(int a, int b) {
      return a * b;
   }
}

Detailed Solution for Test: Methods in Java - 1 - Question 5

The 'multiply' method takes two integers as parameters and returns their product. The 'main' method calls the 'multiply' method with arguments 3 and 4, so the output will be the product of these numbers, which is 12.

Test: Methods in Java - 1 - Question 6

Which of the following is a valid method declaration in Java?

Detailed Solution for Test: Methods in Java - 1 - Question 6

In Java, a method declaration consists of a return type (or 'void' if the method does not return a value), followed by the method name, parentheses, and optionally a parameter list.

Test: Methods in Java - 1 - Question 7

What is method overloading in Java?

Detailed Solution for Test: Methods in Java - 1 - Question 7

Method overloading in Java allows you to define multiple methods with the same name but different parameter lists. The compiler determines which method to call based on the arguments passed.

Test: Methods in Java - 1 - Question 8

What will be the output of the following code?
public class MyClass {
   public static void main(String[] args) {
      printMessage("Hello");
      printMessage("Hi", 3);
   }

   public static void printMessage(String message) {
      System.out.println(message);
   }

   public static void printMessage(String message, int count) {
      for (int i = 0; i < count; i++) {
         System.out.println(message);
      }
   }
}

Detailed Solution for Test: Methods in Java - 1 - Question 8

The 'printMessage' method is overloaded to accept either a single string or a string and an integer. In the 'main' method, the first call to 'printMessage' will print "Hello," and the second call will print "Hi" three times.

Test: Methods in Java - 1 - Question 9

What is the difference between instance methods and static methods in Java?

Detailed Solution for Test: Methods in Java - 1 - Question 9

Instance methods are associated with an instance of a class and can access instance variables. Static methods, on the other hand, are not associated with any specific instance and cannot access instance variables directly.

Test: Methods in Java - 1 - Question 10

What is the return type of a method that does not return any value?

Detailed Solution for Test: Methods in Java - 1 - Question 10

When a method does not return any value, its return type is specified as 'void' in Java.

Test: Methods in Java - 1 - Question 11

What will be the output of the following code?
public class MyClass {
   public static void main(String[] args) {
      int x = 5;
      int y = increment(x);
      System.out.println(y);
   }

   public static int increment(int value) {
      return ++value;
   }
}

Detailed Solution for Test: Methods in Java - 1 - Question 11

The 'increment' method takes an integer as a parameter, increments it by 1, and returns the incremented value. In the 'main' method, the variable 'x' is assigned the value 5, and the 'increment' method is called with 'x' as an argument. The returned value (6) is then printed.

Test: Methods in Java - 1 - Question 12

What is the scope of a local variable declared inside a method?

Detailed Solution for Test: Methods in Java - 1 - Question 12

A local variable declared inside a method is only accessible within that method. It cannot be accessed from other methods or outside the method.

Test: Methods in Java - 1 - Question 13

Which of the following is true about method parameters in Java?

Detailed Solution for Test: Methods in Java - 1 - Question 13

A method in Java can have multiple parameters, and they can have the same name. The parameters act as variables within the method's scope.

Test: Methods in Java - 1 - Question 14

What will be the output of the following code?
public class MyClass {
   public static void main(String[] args) {
      int result = calculate(5, 3);
      System.out.println(result);
   }

   public static int calculate(int a, int b) {
      int result = a - b;
      return result;
   }
}

Detailed Solution for Test: Methods in Java - 1 - Question 14

The 'calculate' method takes two integers as parameters, subtracts the second number from the first, and returns the result. In the 'main' method, the 'calculate' method is called with arguments 5 and 3, resulting in the value 2, which is printed.

Test: Methods in Java - 1 - Question 15

Which of the following is true about method signatures in Java?

Detailed Solution for Test: Methods in Java - 1 - Question 15

The method signature in Java consists of the method name and the parameter types. It does not include the return type or the access modifiers.

Test: Methods in Java - 1 - Question 16

What is the purpose of method parameters in Java?

Detailed Solution for Test: Methods in Java - 1 - Question 16

Method parameters in Java provide a way to pass data to a method. They act as placeholders for the values that are passed when the method is called.

Test: Methods in Java - 1 - Question 17

What will be the output of the following code?
public class MyClass {
   public static void main(String[] args) {
      int x = 10;
      changeValue(x);
      System.out.println(x);
   }

   public static void changeValue(int value) {
      value = 20;
   }
}

Detailed Solution for Test: Methods in Java - 1 - Question 17

In Java, method parameters are passed by value. When 'changeValue' method is called, a copy of the value of 'x' is passed. The method modifies the copy, but it does not affect the original variable 'x'.

Test: Methods in Java - 1 - Question 18

Which of the following is true about recursive methods in Java?

Detailed Solution for Test: Methods in Java - 1 - Question 18

Recursive methods in Java must have at least one base case, which is a condition that terminates the recursion. Without a base case, the recursive method would continue calling itself indefinitely, leading to a stack overflow error.

Test: Methods in Java - 1 - Question 19

What is method overriding in Java?

Detailed Solution for Test: Methods in Java - 1 - Question 19

Method overriding in Java occurs when a subclass provides its own implementation of a method that is already defined in its superclass. The overriding method has the same name, return type, and parameter list as the method in the superclass.

Test: Methods in Java - 1 - Question 20

What will be the output of the following code?
public class MyClass {
   public static void main(String[] args) {
      printNumber(5);
   }

   public static void printNumber(int num) {
      if (num <= 0) {
         return;
      }
      System.out.println(num);
      printNumber(num - 1);
   }
}

Detailed Solution for Test: Methods in Java - 1 - Question 20

The 'printNumber' method is a recursive method that prints the number passed as an argument and then recursively calls itself with 'num - 1'. The recursion continues until 'num' becomes 0 or negative.

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