Java Basics Quiz

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

• `int 1x = 10;`

• `int x = 10;`

• `float y = 10.0;`

• `boolean z = "true";`

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DOK Level 1: Recall

What is the result of the following expression in Java: `5 + 3 * 2`?

• 16

• 11

• 10

• 8

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DOK Level 1: Recall

Which of the following data types is used to create a variable that should store text?

• `int`

• `char`

• `String`

• `boolean`

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DOK Level 1: Recall

Given the array `int[] numbers = {1, 2, 3, 4, 5};`, what is the value of `numbers[2]`?

• 1

• 2

• 3

• 4

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DOK Level 1: Recall

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

• `public void myMethod()`

• `void myMethod() public`

• `public myMethod() void`

• `void public myMethod()`

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DOK Level 1: Recall

What is the output of the following code snippet? ```java String str = "Hello"; System.out.println(str.length()); ```

• 4

• 5

• 6

• 0

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DOK Level 1: Recall

Which of the following operators is used to compare two values in Java?

• `=`

• `==`

• `!=`

• `<>`

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DOK Level 1: Recall

What will be the output of the following code? ```java int[] arr = {10, 20, 30, 40, 50}; System.out.println(arr[3]); ```

• 10

• 20

• 30

• 40

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DOK Level 1: Recall

Which of the following statements is true about Java classes?

• A class can have multiple constructors.

• A class can only have one method.

• A class cannot have any fields.

• A class must be declared as `public`.

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DOK Level 2: Skill/Concept

Consider the following method: ```java public int add(int a, int b) { return a + b; } ``` What will be the output of `add(5, 3)`?

• 5

• 8

• 15

• 53

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DOK Level 2: Skill/Concept