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Learn Apex
Constructors
A constructor runs when you new a class. You can overload constructors with different parameters — Apex picks the matching signature.
new

Which constructor runs?

new Service("acme")

Matching overloads
public class Service {
    public Service() {
        // default
    }
    public Service(String tenant) {
        this();
    }
    public Service(String tenant, Boolean strict) {
        this(tenant);
    }
}

Use constructors to establish invariants — if bad input, throw a clear exception early.