Java Operators

Operators work on values. Arithmetic: + - * / %. Comparison: == != < > <= >=. Logical: && (and), || (or), ! (not).

ExampleJava

public class Main {
  public static void main(String[] args) {
    int a = 17, b = 5;
    System.out.println(a + b);   // 22
    System.out.println(a / b);   // 3  (integer division drops the decimals)
    System.out.println(a % b);   // 2  (remainder)
    System.out.println((double) a / b); // 3.4
    System.out.println(a > b && b > 0); // true

    int x = 10;
    x += 5;   // x = x + 5
    x++;      // x = x + 1
    System.out.println(x);
  }
}

Output

22
3
2
3.4
true
16

Dividing two int values gives an int. To keep the decimals, convert one of them to double first, as in (double) a / b.

Quick check

What is 17 / 5 when both are int?

33.42

Finish the quick check (and any code exercise) to complete this lesson, or mark it done yourself.

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