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String Length String txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; System.out.println("The length of the txt string is: " + txt.length());

size & range of data type

Data types are divided into two groups: Primitive data types - includes byte, short, int, long, float, double, boolean and char Non-primitive data types - such as String, Arrays and Classes (you will learn more about these in a later chapter)

Java Data Types int myNum = 5; // Integer (whole number) float myFloatNum = 5.99f; // Floating point number char myLetter = 'D'; // Character boolean myBool = true; // Boolean String myText = "Hello"; // String

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Display Variables: String name = "John"; System.out.println("Hello " + name);

Other Types: int myNum = 5; float myFloatNum = 5.99f; char myLetter = 'D'; boolean myBool = true; String myText = "Hello";

Final Variables However, you can add the final keyword if you don't want others (or yourself) to overwrite existing values (this will declare the variable as "final" or "constant", which means unchangeable and read-only): Example final int myNum = 15; myNum = 20; // will generate an error: cannot assign a value to a final variable

Example Create a variable called myNum of type int and assign it the value 15: int myNum = 15; System.out.println(myNum);