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[英]Object oriented programming, getter is not getting private variable from another class
[英]How can access to a private variable in another class by using a getter function?
一级(父级)
package revisionOOP;
public class Myclass {
private int x;
public void changeThis() {
x = 10;
System.out.println("x = " + x);
}
//getter
public int UnprivateX() {
return this.x;
}
public static void main(String[] args) {
Myclass inst = new Myclass();
inst.changeThis();
}
}
其他班级(子班级)
package revisionOOP;
public class MySecondClass extends Myclass {
static int y;
public void changeExThis() {
y = 20;
System.out.println("x = " + inst.UnprivateX());
//I want to get the private x value from Myclass class ,How ?
System.out.println("y = " + y);
}
public static void main(String[] args) {
MySecondClass inst = new MySecondClass();
Myclass inst2 = new Myclass();
inst2.changeThis();
inst.changeThis();
inst.changeExThis();
}
}
如何使用 getter 函数访问另一个类中的私有变量? 我如何在子类中更改它?
您可以像这样在孩子中使用方法
public void changeExThis() {
y = 20;
System.out.println("x = " + UnprivateX());
System.out.println("y = " + y);
}
你也可以使用this.UnprivateX()
或super.UnprivateX()
首先,您应该将类的所有字段声明为私有,然后为每个字段创建 getter 和 setter,它们的名称必须以 getFieldName 和 setFieldName 开头。 并且应该是公开的。
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