在Java中,有什么区别:

private final static int NUMBER = 10;

and

private final int NUMBER = 10;

两者都是私有的和final的,不同的是静态属性。

更好的是什么?,为什么?


当前回答

根据Jon的回答,如果你使用静态韵母,它将表现为一种“定义”。一旦你编译了使用它的类,它将在编译后的.class文件中被烧毁。 在这里查看我的帖子。

对于你的主要目标:如果你没有在类的不同实例中使用不同的NUMBER,我建议使用final和static。 (您只需要记住,在不考虑像我的案例研究所描述的那样可能出现的问题的情况下,不要复制已编译的类文件。大多数情况下不会发生这种情况,别担心:))

为了向你展示如何在实例中使用不同的值,检查下面的代码:

public class JustFinalAttr {
  public final int Number;

  public JustFinalAttr(int a){
    Number=a;
  }
}

...System.out.println(new JustFinalAttr(4).Number);

其他回答

这是另一个简单的例子来理解静态,静态final, final变量的用法。代码注释有适当的解释。

public class City {

    // base price that is always same for all objects[For all cities].
    private static double iphone_base_price = 10000;

    // this is total price = iphone_base_price+iphone_diff;
    private double iphone_citi_price;

    // extra price added to iphone_base_price. It is constant per city. Every
    // city has its own difference defined,
    private final double iphone_diff;

    private String cityName = "";

    // static final will be accessible everywhere within the class but cant be
    // changed once initialized.
    private static final String countryName = "India";

    public City(String cityName, double iphone_diff) {
        super();
        this.iphone_diff = iphone_diff;
        iphone_citi_price = iphone_base_price + iphone_diff;
        this.cityName = cityName;

    }

    /**
     * get phone price
     * 
     * @return
     */
    private double getPrice() {

        return iphone_citi_price;
    }

    /**
     * Get city name
     * 
     * @return
     */
    private String getCityName() {

        return cityName;
    }

    public static void main(String[] args) {

        // 300 is the
        City newyork = new City("Newyork", 300);
        System.out.println(newyork.getPrice() + "  " + newyork.getCityName());

        City california = new City("California", 800);
        System.out.println(california.getPrice() + "  " + california.getCityName());

        // We cant write below statement as a final variable can not be
        // reassigned
        // california.iphone_diff=1000; //************************

        // base price is defined for a class and not per instances.
        // For any number of object creation, static variable's value would be the same
        // for all instances until and unless changed.
        // Also it is accessible anywhere inside a class.
        iphone_base_price = 9000;

        City delhi = new City("delhi", 400);
        System.out.println(delhi.getPrice() + "  " + delhi.getCityName());

        City moscow = new City("delhi", 500);
        System.out.println(moscow.getPrice() + "  " + moscow.getCityName());

        // Here countryName is accessible as it is static but we can not change it as it is final as well. 
        //Something are meant to be accessible with no permission to modify it. 
        //Try un-commenting below statements
        System.out.println(countryName);

        // countryName="INDIA";
        // System.out.println(countryName);

    }

}

对于final,可以在初始化时在运行时分配不同的值。 例如

class Test{
  public final int a;
}

Test t1  = new Test();
t1.a = 10;
Test t2  = new Test();
t2.a = 20; //fixed

因此,每个实例都有不同的字段a值。

对于静态final,所有实例共享相同的值,并且在第一次初始化后不能更改。

class TestStatic{
      public static final int a = 0;
}

TestStatic t1  = new TestStatic();
t1.a = 10; // ERROR, CAN'T BE ALTERED AFTER THE FIRST 
TestStatic t2  = new TestStatic();
t1.a = 20;   // ERROR, CAN'T BE ALTERED AFTER THE FIRST INITIALIZATION.

静态变量属于类(这意味着所有对象共享该变量)。非静态变量属于每个对象。

public class ExperimentFinal {

private final int a;
private static final int b = 999; 

public ExperimentFinal(int a) {
    super();
    this.a = a;
}
public int getA() {
    return a;
}
public int getB() {
    return b;
}
public void print(int a, int b) {
    System.out.println("final int: " + a + " \nstatic final int: " + b);
}
public static void main(String[] args) {
    ExperimentFinal test = new ExperimentFinal(9);
    test.print(test.getA(), test.getB());
} }

正如你可以看到上面的例子,对于“final int”,我们可以为类的每个实例(对象)分配变量,然而对于“static final int”,我们应该在类中分配一个变量(静态变量属于类)。

静态成员是所有类实例和类本身上的相同成员。 非静态是每个实例(对象)的一个,所以在你的具体情况下,如果你不放置静态是浪费内存。

假设类永远不会有多个实例,那么哪个实例占用更多内存:

私有静态最终int ID = 250; 或 private final int ID = 250;

我已经理解,静态将引用类类型,在内存中只有一个副本,而非静态将在每个实例变量的新内存位置。但是在内部,如果我们只是比较同一个类的1个实例(即不会创建多个实例),那么在1个静态final变量所使用的空间方面是否有任何开销?