What types of operators (statements) exist in Java?

In Java, operators (statements) are commands executed by the program. They form the basic building blocks of programs.

Types of operators:

• Expression Statements: Consist of an expression followed by a semicolon (;). The expression is evaluated, and the result is discarded unless it is an assignment, method call, or ++/-- operators.
• Declaration Statements: Used to declare variables, classes, or methods.
• Control-Flow Statements: Define the order of execution of other operators. Include:
  • Selection Statements:
    • if-then
    • if-then-else
    • switch
  • Looping Statements:
    • for
    • while
    • do-while
    • for-each (enhanced for)
  • Jump Statements: Change the normal flow of execution.
    • break
    • continue
    • return
• Block Statements: A group of zero or more operators enclosed in curly braces {}. Block statements create a scope.

Examples:

// Expression operator
int x = 10;

// Declaration operator
String name;
class MyClass {}

// Control flow operator - if
if (x > 5) {
    System.out.println("x is greater than 5");
}

// Control flow operator - for
for (int i = 0; i < 3; i++) {
    System.out.println(i);
}

// Control flow operator - break
while (true) {
    if (x == 10) {
        break; // Exit the loop
    }
    x++;
}

// Block operator
{
    int y = 20; // Variable y is only visible here
    System.out.println(y);
}