java access modifer Private

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private

1.private data members  and methods are only accessible within the class

private变量，方法只能在同一个类中被访问

2.Class and interface cannot be declared as private 

class和interface不能被private修饰

3.If a class has private constructor then you cannot create the object of that class from outside of class.

类中private修饰的构造函数，不能在类的外部实例化

 

①DEF.java

②Example.java

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①DEF.java

public class DEF {
    private double num = 100;

    private int square(int a) {
        return a * a;
    }
}
 

 

 

 

②Example.java ,编译失败

 

解决方法

去掉private

修改之后的DEF.java

public class DEF {
    double num = 100;

    int square(int a) {
        return a * a;
    }
}

运行Example.java，可以正常编译执行。

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