Classes & Constructors in Java
From the Java cheat sheet · Classes & Records · verified Jul 2026
Classes & Constructors
Fields, constructors, this, and access modifiers.
java
// Quick Reference
class Person {
private String name;
Person(String name) { this.name = name; }
String getName() { return name; }
}
var p = new Person("Sam");💡 this refers to the current object - it disambiguates fields from parameters.
⚡ this(...) chains to another constructor in the same class to avoid duplication.
📌 Access modifiers: private (class), default (package), protected (subclass), public.
🟢 Keep fields private and expose behavior through methods (encapsulation).
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