Data types in Java
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The document discusses different data types in Java including primitive types like boolean, char, byte, short, int, long, float and double as well as non-primitive types like classes, interfaces, and arrays. It notes that lower data types can be summed to higher types which return the higher data type and underscores are allowed in numbers. Non-primitive types are user-defined and reference types that can be created using the class keyword by defining properties and methods like in the Student data type example. The document also mentions value overflow and the var keyword introduced in Java 9 for local variables.
Data types in Java
- 1. Data Types
- 2. Data Types in Java 1. Primitive data types: The primitive data types include boolean, char, byte, short, int, long, float and double. 2. Non-primitive/User Define data types: The non-primitive data types include Classes, Interfaces, and Arrays.
- 3. Should Remember 1. Lower type summation with higher type return higher data type 2. Java allow underscore in number 3. Assigning Higher type in lower type variable is compilation error
- 4. Non-primitive Type ? Know as user define type. ? Also known as Reference type.
- 5. Reserved Words in java
- 6. Create User Define data type ? Use the class keyword ? Class name. ? Define class with property and method
- 7. Student Data Type ? Attributes ? Roll : int ? Name : String ? Registration Number : int ? Emain : String ? Behaviors ? Read ? write
- 9. The var keyword ? Available from java 9 ? Only for local variable ? Can¡¯t use as method/constructor parameter ? Have to assign in declaration line