static关键字

1 public class testFunction {
2     static String HOBBY = "阅读";
3     String ordinaryVal = "睡觉";
4 
5     public static void updateStaticValue(){
6         System.out.println(HOBBY);
7         System.out.println(ordinaryVal); (报错了，不能直接调用，对象才可以调用非static变量)
8     }

1 public class testFunction {
2     static String HOBBY = "阅读";
3     String ordinaryVal = "睡觉";
4 
5     public static void updateStaticValue(){
6         System.out.println(HOBBY);
7         testFunction tf = new testFunction();
8         System.out.println(tf.ordinaryVal); #(正确)
9     }

public class Second  {
    public static void eat(){
        System.out.println("Secode_eat!!!");
    }

    public  void drink(){
        System.out.println("Secode_drink!!!");
    }
}