Java:在代码中创建了多少个对象? [英] Java: How many objects are created in the code?

问题描述

在以下代码中创建了多少个对象?

How many objects are created in the following code?

String a, b, c;
a = "1234";
b = a;
c = a + b;

有人告诉我答案是 2 ，因为只有a和b指向自己的数据.

I was been told the answer is 2, because only a and b point to their own data.

c 仅使用 a 和 b 创建.但是，声明变量不是创建吗?这个问题含糊吗?我说了 3 .

c is only created from using a and b. However, isn't the act of declaring a variable considered creating it? Is this question vague? I said 3.

推荐答案

a ="abcd" 创建一个 String 对象，并将其初始化为值"abcd".那是一个对象

a = "abcd" creates a String object, and initializes it with the value "abcd". So that's one object

b = a 使 b 指向与 a 相同的位置，因此 a + b 将创建一个新对象，然后将其分配给 c .总共创建了两个对象

b = a makes b point to the same spot as a, so then a + b will create a new object, which is then assigned to c. That makes a total of two objects created

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