全域變數vs區域變數

static 只能放在類別層級

package variableScope;//相當於folder/subfolder路徑，必須放在程式碼第一行


public class variableScope {
    int i =1; //instance，全域變數
    static int j=3;//static
    public static void kkk(int k)
    {
//    variableScope obj2 = new variableScope();
        int l=1;//local
    //System.out.println("j is "+j);
    //System.out.println(i);//error, must declare a object
   // System.out.println("k is"+k);
    }
   
   
   
    public static void main(String[] args) {
        //variableScope obj = new variableScope();
   //     System.out.println(i);//error, must declare object
        System.out.println(variableScope.j);
        System.out.println("no . class"+j);
      //   System.out.println(k);//error,can not find local variable k
       //   System.out.println(l);//as above
  //      kkk(3)
       
       
    }
}