Java Language Tutorial => Private Visibility

Example

private visibility allows a variable to only be accessed by its class. They are often used in conjunction with public getters and setters.

class SomeClass {
    private int variable;

    public int getVariable() {
        return variable;
    }

    public void setVariable(int variable) {
        this.variable = variable;
    }
}

public class SomeOtherClass {
    public static void main(String[] args) {
        SomeClass sc = new SomeClass();
        
        // These statement won't compile because SomeClass#variable is private:
        sc.variable = 7;
        System.out.println(sc.variable);

        // Instead, you should use the public getter and setter:
        sc.setVariable(7);
        System.out.println(sc.getVariable());
    }
}

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Java Language

Java Language Visibility (controlling access to members of a class) Private Visibility

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