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Int

Java Variables Course

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This is the EXLskills free and open-source Java Variables Micro Course. It guides learners via explanation, demonstration, and thorough practice, from no more than a basic understanding of Java, to a moderate level of understanding regarding Java variables and operators.

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One of the most commonly used primitive data types is integer, or in Java, int, which can represent any whole number between -2,147,483,648 and 2,147,483,647. View the example below to learn how to declare and use an int variable.

IntegerDataTypeExample.java

package exlcode;
public class IntegerDataTypeExample {
// int can be any integer between -2147483648 and 2147483647
public static int exampleVariableOne = 27;
public static int exampleVariableTwo = -27;
public static int exampleVariableThree = 100000;
public static void main(String[] args) {
System.out.println(exampleVariableOne);
System.out.println(exampleVariableTwo);
System.out.println(exampleVariableThree);
}
}

The integer data type is efficient and versatile; it should be used for any integer math. Notice that int must be a whole number. In case you were wondering, 0 is also a whole number. Assigning int to any non-whole number would cause an error.

In addition to what we see in the example above, we are also able to assign a value to an int by performing a mathematical operation with two numbers, such as int varOne = 10+10; will assign 20 to varOne. As with the other data types we have covered, we are using '=' so that the identifier points to a value it can store.

The negative aspect of the integer data type is if there are any equations that try to create a non-whole number with a decimal out of integer variables, the program will fail because int only allows whole numbers.