Java-Primitive Types

• What types have been covered so far in the course?

  Primitive types
• What are the primitive types in Java?

  Numeric (integer, floating-point, char, Boolean)
• What are non-primitive types also known as?

  Composite types
• What are the non-primitive types in Java?

  • Strings
  • Arrays
  • Objects
• What are the properties of primitive types?

  They are built into the language, cannot be decomposed, and are not classes.
• How do variables of primitive types store values?

  They hold the actual value, not a reference.
• What are the properties of non-primitive types?

  They are not always built into the language, can be decomposed, and are classes.
• How do variables of non-primitive types store values?

  They hold a reference to the value, not the actual value.
• What is an array in Java?

  A collection of elements of the same type.
• How is a String in Java defined?

  A String is made up of a sequence of characters.
• How is the state represented in objects?

  State is represented as fields.
• What is the difference in how primitive and non-primitive types store values?

  Primitive types store actual values, while non-primitive types store references to values.
• How do you compare primitive types in Java?

  Using "==" and "!=" to compare values.
• How do you compare non-primitive types in Java?

  Using "==" and "!=" compares memory locations, while values are compared using type-specific methods.
• What will be printed if $a =$$5.5$ and $b =$$5.5$ are compared with "=="?


  Equal with ==
• What will be printed if two String objects are compared with "=="?


  Equal with ==
• What will be printed if two arrays are compared with "=="?


  Equal with ==
• What happens to the parameter value when it is changed inside a method?

  Changing the value of a parameter inside the method doesn’t change its value externally.
• Can you change the memory location of a non-primitive type parameter inside a method?

  No, you can’t change the memory location, but you can change the contents of that location.
• What will happen to the array 'numbers' after calling $doSomething(numbers)$?


  The array 'numbers' will remain unchanged.
• What will happen to the array 'numbers' after calling $doSomethingElse(numbers)$?


  The second element of 'numbers' will be changed to 5.
• What are the key differences between primitive and non-primitive types in Java?

  • Primitive types:
  • Store actual values
  • Built into the language
  • Cannot be decomposed
  • Not a class
  • Non-primitive types:
  • Store references to values
  • Not always built into the language
  • Can be decomposed
  • Are classes