Java 从对象所在的类创建对象

我想，输出分别是5,10,15,20。但是代码的工作方式是15,20

---

有人能解释一下原因吗？

您的成员是静态的：

public class MultipleObjects2Test {

    static int a;
    static int b;

    MultipleObjects2Test(int a,int b){

        this.a=a;
        this.b=b;}

        public static void main(String[] args) {

            MultipleObjects2Test test = new MultipleObjects2Test(5,10);
            MultipleObjects2Test test1 = new MultipleObjects2Test(15,20);


        System.out.print(test.a);
        System.out.print(test.b);

        System.out.print(test1.a);
        System.out.print(test1.b);

    }
}

因此，这两个实例对

a

和

b

具有相同的值

删除

static

关键字，您将获得预期的输出

static int a;
static int b;

---

a

和

b

被声明为静态，这意味着变化

到

public class MultipleObjects2Test 
{
    int a;
    int b;

    MultipleObjects2Test(int a,int b)
    {
        this.a=a;
        this.b=b;
    }

    public static void main(String[] args) 
    {
        MultipleObjects2Test test = new MultipleObjects2Test(5,10);
        MultipleObjects2Test test1 = new MultipleObjects2Test(15,20);

        System.out.print(test.a);
        System.out.print(test.b);

        System.out.print(test1.a);
        System.out.print(test1.b);
    }
}

static int a;static int b;

 int a; int b;