When the Java compiler encounters something like what’s below, it needs to verify that the Triangle(int, int, int, int) constructor exists: Triangle t = new Triangle(1, 20, 30, 40); Triangle ...

Classes and objects in Java must be initialized before they are used. You’ve previously learned that class fields are initialized to default values when classes are loaded, and that objects are ...

Difference between int and Integer. The key difference between the Java int and Integer types is that an int simply represents a whole number, while an Integer has additional properties and methods.

import java.util.concurrent.atomic.AtomicInteger; public class StaticClass { public static final AtomicInteger countOuter = new AtomicInteger(0); public static final AtomicInteger countInner = new ...