如何在java中访问实例变量和方法

Question

用于访问实例变量和方法的java程序（系统在全局声明“int puppyAge;”中预期的令牌“int”导入时抛出语法错误： -

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 ); 
    }
}