セクション 1. 章 9

single

メニューを表示するにはスワイプしてください

Operators

We observed that we used basic mathematical operators such as +, -, /, and *. These operators are familiar to us from calculators or mathematics; you can also use them in a code editor.

Let's go through the basics:

+ – addition;
- – subtraction;
/ – division;
* – multiplication.

You can use these four fundamental operators with numerical data types (byte, short, long, float, double).

Let's explore the usage of these operators with an example code:

Main.java


              1234567891011121314
            
package com.example;

public class Main {
    public static void main(String[] args) {
        // Creating an int variable with value 10
        int a = 10; 
        // Creating an int variable with value 17
        int b = 17; 
        // Creating an int variable to store the sum of `a` and `b`
        int res = a + b; 
        // Printing the result to the console
        System.out.println(res); 
   }
}

As we can see, the variable res holds the value 27, which is the sum of 10 and 17.

Let's consider a few more examples:

Main.java


              12345678910111213141516171819
            
package com.example;

public class Main {
    public static void main(String[] args) {
        // Creating an int variable with the sum of 16 and 4
        int plus = 16 + 4; 
        /* Creating an int variable with the value of the subtraction 
        of the `plus` variable and 10 */ 
        int minus = plus - 10; 
        /* Variable that holds the result of multiplying 
        the `minus` variable by 4 */ 
        int multiplying = minus * 4; 
        /* Using subtraction and division operations 
        on the `multiplying` variable */ 
        int complexDivision = (multiplying - 4) / 9; 
        // Printing the result to the console
        System.out.println(complexDivision); 
    }
}

We can use both numbers and variables in operations, but creating many variables increases stack memory usage, so using numbers directly is often preferable. Operator precedence is applied: parentheses first, then multiplication or division, and finally addition or subtraction.

This allows us to perform simple operations with different numeric values.

Order of Operations

Java follows the basic principles of mathematics, and operations also have an order of execution. Let's take a look at an example:

main.java


              12345678
            
package com.example;

public class Main {
    public static void main(String[] args) {
        int result = (10 + 5) * 2 - 8 / 4 + 1;
        System.out.println(result);
    }
}