public_Keyword

ゝ一世哀愁。 2021-11-04 13:54 260阅读 0赞

## public Java Keyword with Examples ##

The public keyword is an access control modifier that may be applied to a class, a method or a field (a variable declared in a class).  
If a class or its members are declared as public, they can be accessed from any other class regardless of the package boundary. It is comparable to a public place in the real world, such as a company cafeteria that all employees can use irrespective of their department.  
public Java Keyword Example  
Below example demonstrates the usage of public access modifier and it’s visibility. Please refer the comments are self-descriptive:

class ClassA {
        public String clazzName;
    
        public ClassA() {
    
        }
    
        public ClassA(String clazzName) {
            this.clazzName = clazzName;
        }
    
        public String getName() {
    
            System.out.println(clazzName); // public field can be used anywhere
            InnerClass innerClass = new InnerClass(); //public Inner Class can be used anywhere.
            return this.clazzName;
        }
    
        public class InnerClass {
    
        }
    }
    
    class ClassB extends ClassA {
        void test() {
    
            System.out.println(clazzName); //public field can be inherited to any subclass
    
            ClassA classA = new ClassA();
    
            System.out.println(classA.clazzName); //public field can be used anywhere
    
            classA.getName(); //public method can be used anywhere
    
            ClassA.InnerClass b = new ClassA.InnerClass(); //public Inner Class can be used anywhere.
        }
    }
    
    // below class is a different package
    class ClassD extends ClassA {
        void methodOfClassD() {
            System.out.println(clazzName); // public field can be inherited to any sub class
    
            ClassA a = new ClassA();
            System.out.println(a.clazzName); // Public field can be used anywhere
            a.getName(); // Public method can be used anywhere
            ClassA.InnerClass innerClass = new ClassA.InnerClass(); // Public inner class can be used anywhere
        }
    }

public_Keyword

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