Java Concepts Quiz

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

• `int 1stNumber;`

• `int firstNumber;`

• `int first number;`

• `int first-Number;`

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DOK Level 1: Recall

What is the output of the following code snippet? ```java int x = 5; if (x > 3) { x = 10; } System.out.println(x); ```

• `3`

• `5`

• `10`

• `0`

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DOK Level 2: Skill/Concept

What is the purpose of the `break` statement in a switch case?

• To exit the switch statement

• To continue to the next case

• To terminate the program

• To skip the current case

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DOK Level 1: Recall

Consider the following class definition: ```java public class Animal { String name; int age; public void makeSound() { System.out.println("Some sound"); } } ``` Which of the following statements is true?

• `Animal` is a method

• `name` is a method

• `makeSound` is a method

• `age` is a class

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DOK Level 1: Recall

What will be the output of the following code? ```java String str = "Hello, World!"; System.out.println(str.length()); ```

• `12`

• `13`

• `14`

• `15`

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DOK Level 2: Skill/Concept

What is the correct syntax to handle an exception in Java?

• `try { ... } catch (Exception e) { ... }`

• `try { ... } except (Exception e) { ... }`

• `try { ... } finally (Exception e) { ... }`

• `try { ... } handle (Exception e) { ... }`

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DOK Level 1: Recall

What will be the output of the following code? ```java for (int i = 0; i < 5; i++) { System.out.print(i + " "); } ```

• `0 1 2 3 4`

• `1 2 3 4 5`

• `0 1 2 3 4 5`

• `1 2 3 4`

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DOK Level 2: Skill/Concept

Which of the following is a correct way to declare a method in Java?

• `public void myMethod() { ... }`

• `public myMethod() void { ... }`

• `void public myMethod() { ... }`

• `void myMethod() public { ... }`

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DOK Level 1: Recall

Which declaration will throw an error?

• double num = 8;

• int averageGrade = 89.7;

• boolean done = false;

• String done = "true";

We use For loop ..........

• To repeat a specified number of operations.
• To repeat a unspecified number of operations.
• All answers are correct