Question

用于访问实例变量和方法的java程序（系统在全局声明中强制使用令牌“int”导入时出现语法错误“int puppyAge;”： -

是否可以选择全局声明变量： -

package instancevariableandmethods;
int puppyAge;

public class Instancevariable {
    public Instancevariable(String name) {
        System.out.println("The name is :"+name);
    }

    public void setAge(int age) {
        puppyAge = age;
    }

    public int getAge() {
        System.out.println("Puppy's age is :" + puppyAge );
        return puppyAge;
    }

    public static void main(String[] args) {
        Instancevariable  myPuppy = new Instancevariable( "tommy" );

        /* Call class method to set puppy's age */
        myPuppy.setAge( 2 );

        /* Call another class method to get puppy's age */
        myPuppy.getAge( );

        /* You can access instance variable as follows as well */
        System.out.println("Variable Value :" + myPuppy.puppyAge ); 
    }
}

Answer 1

声明您的variable，如下所示

     public class Instancevariable 

       {
         int puppyAge;
          //// rest of your code
       }

示例 - 全局和局部变量声明

public class Car { 
    private int speed; //private variable declaration
    public int wheels; //public variable declaration

    /*...constructor, etc...*/

    public void speedUp() {
        //local variable declaration, in line assignment, only seen within speedUp method
        int speedIncrease = 10;
        speed += speedIncrease;
    }
}

Answer 2

请格式化您的代码段并使用java编码约定。

Java中没有全局变量，类级别有静态变量，但它们在类的所有实例中共享。在这种情况下，您需要的是一个类字段。

package instancevariableandmethods;


public class Instancevariable

{
    int puppyAge;

    public Instancevariable(String name) {

        System.out.println("The name is :" + name);

    }


    public void setAge(int age) {

        puppyAge = age;
    }


    public int getAge() {

        System.out.println("Puppy's age is :" + puppyAge);
        return puppyAge;

    }

    public static void main(String[] args) {


        Instancevariable myPuppy = new Instancevariable("tommy");

      /* Call class method to set puppy's age */
        myPuppy.setAge(2);

      /* Call another class method to get puppy's age */
        myPuppy.getAge();

      /* You can access instance variable as follows as well */
        System.out.println("Variable Value :" + myPuppy.puppyAge);

    }
}

Answer 3

您的NAN属于班级，不属于上课。

int puppyAge;

Answer 4

你做错了。您可以在类中声明类变量。如果你想让它超级全球化使用＆＃34; public＆＃34;。

public class TemplateVO 


   {
     public int puppyAge;
     //rest of your code

如何在java中访问实例变量和方法

4 个答案: