Introduction to Java Quiz

What is the correct way to declare a variable in Java?

• `int number = 5;`

• `int number = "5";`

• `int number = 5.0;`

• `int number = '5';`

Which of the following is a valid Java data type?

• `integer`

• `String`

• `character`

• `real`

What is the output of the following code snippet? ```java System.out.println(10 + 20); ```

• `30`

• `1020`

• `10 + 20`

• `Error`

Which of the following is a control structure in Java?

• `if`

• `loop`

• `switch`

• `both A and C`

What is the default value of a boolean variable in Java?

• `true`

• `false`

• `0`

• `null`

Which of the following is used to read input from the user in Java?

• `Scanner`

• `InputReader`

• `BufferedReader`

• `ConsoleReader`

What is the result of the expression `5 % 2` in Java?

• `2`

• `1`

• `0`

• `5`

Which keyword is used to define a constant in Java?

• `constant`

• `final`

• `static`

• `const`

What will be the output of the following code? ```java int x = 5; x += 3; System.out.println(x); ```

• `5`

• `8`

• `3`

• `Error`

Which of the following is not a primitive data type in Java?

• `int`

• `boolean`

• `String`

• `char`