Java Operators Interview Questions and Answers

Java Operators

Q1. What are arithmetic operators in Java?

Arithmetic operators are used to perform basic mathematical operations like addition, subtraction, multiplication, division, and modulo.

Example

int a = 10, b = 3;
System.out.println(a + b); // addition
System.out.println(a - b); // subtraction
System.out.println(a * b); // multiplication
System.out.println(a / b); // division
System.out.println(a % b); // modulo

Output:

Use: Arithmetic operators are used in calculations such as totals, averages, and formulas.

Q2. What are increment and decrement operators in Java?

++ increases a value by 1.

-- decreases a value by 1.

They can be prefix or postfix.

Example

int x = 5;
System.out.println(++x); // prefix: first increment then use
System.out.println(x++); // postfix: first use then increment
System.out.println(--x); // prefix
System.out.println(x--); // postfix

Output:

Q3. What is operator precedence in Java and why is it important?

Operator precedence defines the order in which operators are executed.

Example

int result = 10 + 2 * 5;
System.out.println(result);

Output:

Q4. How does the ternary operator work in Java?

The ternary operator ?: is a shorthand for if-else.

Example

int age = 18;
String result = (age >= 18) ? "Adult" : "Minor";
System.out.println(result);

Output:

Adult

Q5. What are assignment operators in Java?

Assignment operators (=, +=, -=, *=, /=, %=) assign values and perform operations in a shorter way.

Example

  int x = 5;
  int x = 10;
  x += 5; // x = x + 5
  x *= 2; // x = x * 2
  System.out.println(x);

Output: