Instance methods in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to call the instance method greet on the object person.

Java

Person person = new Person();
person.[1]();

Drag options to blanks, or click blank then click option'

AsayHello

BGreet

Cgreet

DgreetPerson

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect method names or wrong capitalization.

Trying to call the method without the object.

The instance method is named greet, so calling person.greet() is correct.

2fill in blank

medium

Complete the code to define an instance method named sayAge that prints the age.

Java

public class Person {
    int age;
    public void [1]() {
        System.out.println("Age: " + age);
    }
}

Drag options to blanks, or click blank then click option'

AsayAge

BshowAge

CprintAge

DgetAge

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different method name than requested.

Forgetting to include parentheses after the method name.

The method name must be sayAge as requested to match the task.

3fill in blank

hard

Fix the error in the instance method call to correctly print the name.

Java

public class Person {
    String name;
    public void printName() {
        System.out.println(name);
    }
}

Person p = new Person();
p.name = "Alice";
p.[1]();

Drag options to blanks, or click blank then click option'

Aprint_Name

BPrintName

Cprintname

DprintName

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong capitalization in method names.

Adding underscores or other characters not in the method name.

Method names are case-sensitive in Java. The correct method name is printName.

4fill in blank

hard

Fill both blanks to create a method that returns the full name by combining first and last names.

Java

public class Person {
    String firstName;
    String lastName;
    public String [1]() {
        return firstName + [2] + lastName;
    }
}

Drag options to blanks, or click blank then click option'

AgetFullName

B-

C " "

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using a minus sign instead of a space string.

Forgetting to add a space between names.

The method name should be getFullName. To combine names with a space, use " " between them.

5fill in blank

hard

Fill both blanks to define an instance method isAdult that returns true if age is 18 or more.

Java

public class Person {
    int age;
    public boolean [1]() {
        return age [2] 18;
    }
}

Drag options to blanks, or click blank then click option'

AisAdult

B>=

C;

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using > instead of >=, which excludes age 18.

Forgetting the semicolon at the end of the return statement.

The method name is isAdult. The condition uses >= to check if age is 18 or more. The statement ends with a semicolon.