Static imports (import static)

Static import allows importing static members (fields and methods) of a class so they can be used without the class name.

Syntax:

import static packageName.ClassName.staticMember;
import static packageName.ClassName.*;   // all static members

Example without static import:

double result = Math.sqrt(25);
System.out.println(Math.PI);

With static import:

import static java.lang.Math.sqrt;
import static java.lang.Math.PI;

double result = sqrt(25);
System.out.println(PI);

Importing all static members:

import static java.lang.Math.*;

double r = sqrt(25);
double area = PI * r * r;

Use cases:

• Mathematical constants and functions (Math, StrictMath)
• Testing frameworks (e.g., import static org.junit.Assert.*;)

Caveats:

• Can reduce readability (harder to know where a method comes from).
• Avoid overusing; use sparingly for well‑known utilities.

Example with custom class:

class Constants {
    public static final String APP_NAME = "MyApp";
    public static void log(String msg) { ... }
}

import static Constants.*;
String name = APP_NAME;
log("Started");